chore(release): bump version to 0.1.1

fix(ci): remove all duplicate assets before re-uploading in publish-gitea-release.sh
feat(input): Wayland-Tablet-Protokoll für aktive Stifte (Lazarite) und Touchscreen-Pinch-to-Zoom
2026-10-06 15:59:01 +02:00 · 2026-10-06 15:43:11 +02:00 · 2026-10-06 14:58:59 +02:00 · 2026-10-06 12:56:39 +02:00 · 2026-10-06 12:40:52 +02:00 · 2026-10-06 12:36:10 +02:00
28 changed files with 3186 additions and 916 deletions
@@ -9,15 +9,25 @@ on:
 jobs:
  release:
    name: Build Packages & Publish to Gitea
+    # Hinweis zum Gitea act_runner:
+    # Standardmäßig 'ubuntu-latest'. Falls Ihr Runner unter einem anderen Label registriert ist
+    # (z. B. 'linux', 'ubuntu-24.04' oder 'host'), passen Sie dieses Label an.
    runs-on: ubuntu-latest
    steps:
      - name: Checkout Repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v4.2.2

      - name: Install System Packaging Tools
        run: |
-          sudo apt-get update
-          sudo apt-get install -y --no-install-recommends \
+          export DEBIAN_FRONTEND=noninteractive
+          SUDO=""
+          if [ "$(id -u)" -ne 0 ]; then
+            if command -v sudo >/dev/null 2>&1; then
+              SUDO="sudo"
+            fi
+          fi
+          $SUDO apt-get update -y
+          $SUDO apt-get install -y --no-install-recommends \
            build-essential \
            pkg-config \
            libx11-dev \
@@ -31,11 +41,17 @@ jobs:
            python3

      - name: Setup Rust Toolchain
-        uses: actions-rust-lang/setup-rust-toolchain@v1
+        uses: actions-rust-lang/setup-rust-toolchain@v1.11.0
        with:
          toolchain: stable
          cache: true

+      - name: Code Quality & Testing (Quality Gates)
+        run: |
+          cargo fmt --check
+          cargo clippy --all-targets -- -D warnings
+          cargo test
+
      - name: Build Release Artifacts (.deb, .AppImage, SHA256SUMS.txt)
        run: |
          chmod +x scripts/*.sh
@@ -43,8 +59,9 @@ jobs:

      - name: Publish Release to Gitea
        run: |
-          ./scripts/publish-gitea-release.sh "${{ secrets.GITEA_TOKEN || secrets.GITHUB_TOKEN }}"
+          ./scripts/publish-gitea-release.sh
        env:
+          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN || secrets.GITHUB_TOKEN }}
          GITEA_SERVER: ${{ github.server_url }}
          REPO_OWNER: ${{ github.repository_owner }}
          REPO_NAME: ${{ github.event.repository.name }}
@@ -118,6 +118,12 @@ version = "1.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f2032f911046de80f0a198e0901378627c33f59ea0ac00e363d481118bd70a53"

+[[package]]
+name = "base64"
+version = "0.22.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72b3254f16251a8381aa12e40e3c4d2f0199f8c6508fbecb9d91f575e0fbb8c6"
+
 [[package]]
 name = "bit-set"
 version = "0.5.3"
@@ -151,6 +157,15 @@ version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0d8c1fef690941d3e7788d328517591fecc684c084084702d6ff1641e993699a"

+[[package]]
+name = "block-buffer"
+version = "0.10.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3078c7629b62d3f0439517fa394996acacc5cbc91c5a20d8c658e77abd503a71"
+dependencies = [
+ "generic-array",
+]
+
 [[package]]
 name = "block-sys"
 version = "0.2.1"
@@ -269,6 +284,12 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fd16c4719339c4530435d38e511904438d07cce7950afa3718a84ac36c10e89e"

+[[package]]
+name = "cfg_aliases"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f079e83a288787bcd14a6aea84cee5c87a67c5a3e660c30f557a3d24761b3527"
+
 [[package]]
 name = "codespan-reporting"
 version = "0.11.1"
@@ -375,6 +396,15 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7f8f80099a98041a3d1622845c271458a2d73e688351bf3cb999266764b81d48"

+[[package]]
+name = "cpufeatures"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "59ed5838eebb26a2bb2e58f6d5b5316989ae9d08bab10e0e6d103e656d1b0280"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "crc32fast"
 version = "1.5.2"
@@ -390,6 +420,16 @@ version = "0.8.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a31eee39dddec8330830986fcd7625edb5a24ec90ea038215273bbc3adb08ac6"

+[[package]]
+name = "crypto-common"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "78c8292055d1c1df0cce5d180393dc8cce0abec0a7102adb6c7b1eef6016d60a"
+dependencies = [
+ "generic-array",
+ "typenum",
+]
+
 [[package]]
 name = "cursor-icon"
 version = "1.2.0"
@@ -403,7 +443,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3e3d747f100290a1ca24b752186f61f6637e1deffe3bf6320de6fcb29510a307"
 dependencies = [
 "bitflags 2.13.2",
- "libloading 0.7.4",
+ "libloading 0.8.9",
 "winapi",
 ]

@@ -413,6 +453,16 @@ version = "0.5.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7cd812cc2bc1d69d4764bd80df88b4317eaef9e773c75226407d9bc0876b211c"

+[[package]]
+name = "digest"
+version = "0.10.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
+dependencies = [
+ "block-buffer",
+ "crypto-common",
+]
+
 [[package]]
 name = "dispatch"
 version = "0.2.0"
@@ -529,6 +579,18 @@ dependencies = [
 "simdutf8",
 ]

+[[package]]
+name = "enum_dispatch"
+version = "0.3.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aa18ce2bc66555b3218614519ac839ddb759a7d6720732f979ef8d13be147ecd"
+dependencies = [
+ "once_cell",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.119",
+]
+
 [[package]]
 name = "epaint"
 version = "0.27.2"
@@ -644,6 +706,16 @@ dependencies = [
 "slab",
 ]

+[[package]]
+name = "generic-array"
+version = "0.14.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "85649ca51fd72272d7821adaf274ad91c288277713d9c18820d8499a7ff69e9a"
+dependencies = [
+ "typenum",
+ "version_check",
+]
+
 [[package]]
 name = "gethostname"
 version = "1.1.0"
@@ -654,6 +726,17 @@ dependencies = [
 "windows-link",
 ]

+[[package]]
+name = "getrandom"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ff2abc00be7fca6ebc474524697ae276ad847ad0a6b3faa4bcb027e9a4614ad0"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
 [[package]]
 name = "getrandom"
 version = "0.3.4"
@@ -747,7 +830,7 @@ dependencies = [
 "presser",
 "thiserror",
 "winapi",
- "windows",
+ "windows 0.52.0",
 ]

 [[package]]
@@ -801,6 +884,12 @@ dependencies = [
 "winapi",
 ]

+[[package]]
+name = "heck"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
+
 [[package]]
 name = "hermit-abi"
 version = "0.5.3"
@@ -949,18 +1038,23 @@ dependencies = [

 [[package]]
 name = "ink-notes"
-version = "0.1.0"
+version = "0.1.1"
 dependencies = [
 "bytemuck",
 "egui",
 "egui-wgpu",
 "egui-winit",
 "glam",
+ "octotablet",
 "pollster",
 "printpdf",
+ "semver",
 "serde",
 "serde_json",
+ "sha2",
 "tempfile",
+ "ureq",
+ "url",
 "webbrowser",
 "wgpu",
 "winit",
@@ -1349,6 +1443,25 @@ dependencies = [
 "cc",
 ]

+[[package]]
+name = "octotablet"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "48c4b9470450ffa669cb3be55ef863dfd9592a06284cb291546363c514bb4aa3"
+dependencies = [
+ "bitflags 2.13.2",
+ "cfg_aliases 0.2.2",
+ "enum_dispatch",
+ "raw-window-handle 0.6.2",
+ "smallvec",
+ "strum",
+ "thiserror",
+ "wayland-backend",
+ "wayland-client",
+ "wayland-protocols",
+ "windows 0.54.0",
+]
+
 [[package]]
 name = "once_cell"
 version = "1.21.4"
@@ -1609,6 +1722,20 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "19b30a45b0cd0bcca8037f3d0dc3421eaf95327a17cad11964fb8179b4fc4832"

+[[package]]
+name = "ring"
+version = "0.17.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a4689e6c2294d81e88dc6261c768b63bc4fcdb852be6d1352498b114f61383b7"
+dependencies = [
+ "cc",
+ "cfg-if",
+ "getrandom 0.2.17",
+ "libc",
+ "untrusted",
+ "windows-sys 0.52.0",
+]
+
 [[package]]
 name = "rustc-hash"
 version = "1.1.0"
@@ -1647,6 +1774,41 @@ dependencies = [
 "windows-sys 0.61.2",
 ]

+[[package]]
+name = "rustls"
+version = "0.23.45"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0d41d731c7d2f962d1ccc364cec258de3c0e93b38c2fb3ba97ac74513048d634"
+dependencies = [
+ "log",
+ "once_cell",
+ "ring",
+ "rustls-pki-types",
+ "rustls-webpki",
+ "subtle",
+ "zeroize",
+]
+
+[[package]]
+name = "rustls-pki-types"
+version = "1.15.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2f4925028c7eb5d1fcdaf196971378ed9d2c1c4efc7dc5d011256f76c99c0a96"
+dependencies = [
+ "zeroize",
+]
+
+[[package]]
+name = "rustls-webpki"
+version = "0.103.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f3c3cf1d8b1e7d4927e2d154c3fcb02979afb9939629c62cd9048d4f07b60ac2"
+dependencies = [
+ "ring",
+ "rustls-pki-types",
+ "untrusted",
+]
+
 [[package]]
 name = "rustversion"
 version = "1.0.23"
@@ -1687,6 +1849,12 @@ dependencies = [
 "tiny-skia",
 ]

+[[package]]
+name = "semver"
+version = "1.0.28"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a7852d02fc848982e0c167ef163aaff9cd91dc640ba85e263cb1ce46fae51cd"
+
 [[package]]
 name = "serde"
 version = "1.0.229"
@@ -1730,6 +1898,17 @@ dependencies = [
 "zmij",
 ]

+[[package]]
+name = "sha2"
+version = "0.10.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a7507d819769d01a365ab707794a4084392c824f54a7a6a7862f8c3d0892b283"
+dependencies = [
+ "cfg-if",
+ "cpufeatures",
+ "digest",
+]
+
 [[package]]
 name = "shlex"
 version = "2.0.1"
@@ -1830,6 +2009,34 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6637bab7722d379c8b41ba849228d680cc12d0a45ba1fa2b48f2a30577a06731"

+[[package]]
+name = "strum"
+version = "0.26.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8fec0f0aef304996cf250b31b5a10dee7980c85da9d759361292b8bca5a18f06"
+dependencies = [
+ "strum_macros",
+]
+
+[[package]]
+name = "strum_macros"
+version = "0.26.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4c6bee85a5a24955dc440386795aa378cd9cf82acd5f764469152d2270e581be"
+dependencies = [
+ "heck",
+ "proc-macro2",
+ "quote",
+ "rustversion",
+ "syn 2.0.119",
+]
+
+[[package]]
+name = "subtle"
+version = "2.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "13c2bddecc57b384dee18652358fb23172facb8a2c51ccc10d74c157bdea3292"
+
 [[package]]
 name = "syn"
 version = "1.0.109"
@@ -2041,6 +2248,12 @@ dependencies = [
 "rustc-hash 2.1.3",
 ]

+[[package]]
+name = "typenum"
+version = "1.20.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b6f5e870be6c3b371b77fe0ee0bafb859fa4964b4404c27de1d380043c4dda20"
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.26"
@@ -2065,6 +2278,30 @@ version = "0.2.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ebc1c04c71510c7f702b52b7c350734c9ff1295c464a03335b00bb84fc54f853"

+[[package]]
+name = "untrusted"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8ecb6da28b8a351d773b68d5825ac39017e680750f980f3a1a85cd8dd28a47c1"
+
+[[package]]
+name = "ureq"
+version = "2.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "02d1a66277ed75f640d608235660df48c8e3c19f3b4edb6a263315626cc3c01d"
+dependencies = [
+ "base64",
+ "flate2",
+ "log",
+ "once_cell",
+ "rustls",
+ "rustls-pki-types",
+ "serde",
+ "serde_json",
+ "url",
+ "webpki-roots 0.26.11",
+]
+
 [[package]]
 name = "url"
 version = "2.5.8"
@@ -2099,6 +2336,12 @@ dependencies = [
 "winapi-util",
 ]

+[[package]]
+name = "wasi"
+version = "0.11.1+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ccf3ec651a847eb01de73ccad15eb7d99f80485de043efb2f370cd654f4ea44b"
+
 [[package]]
 name = "wasip2"
 version = "1.0.4+wasi-0.2.12"
@@ -2310,6 +2553,24 @@ dependencies = [
 "web-sys",
 ]

+[[package]]
+name = "webpki-roots"
+version = "0.26.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "521bc38abb08001b01866da9f51eb7c5d647a19260e00054a8c7fd5f9e57f7a9"
+dependencies = [
+ "webpki-roots 1.0.9",
+]
+
+[[package]]
+name = "webpki-roots"
+version = "1.0.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7dcd9d09a39985f5344844e66b0c530a33843579125f23e21e9f0f220850f22a"
+dependencies = [
+ "rustls-pki-types",
+]
+
 [[package]]
 name = "weezl"
 version = "0.1.12"
@@ -2324,7 +2585,7 @@ checksum = "cbd7311dbd2abcfebaabf1841a2824ed7c8be443a0f29166e5d3c6a53a762c01"
 dependencies = [
 "arrayvec",
 "cfg-if",
- "cfg_aliases",
+ "cfg_aliases 0.1.1",
 "js-sys",
 "log",
 "naga",
@@ -2350,7 +2611,7 @@ dependencies = [
 "arrayvec",
 "bit-vec",
 "bitflags 2.13.2",
- "cfg_aliases",
+ "cfg_aliases 0.1.1",
 "codespan-reporting",
 "indexmap",
 "log",
@@ -2379,7 +2640,7 @@ dependencies = [
 "bit-set",
 "bitflags 2.13.2",
 "block",
- "cfg_aliases",
+ "cfg_aliases 0.1.1",
 "core-graphics-types",
 "d3d12",
 "glow",
@@ -2466,7 +2727,19 @@ version = "0.52.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e48a53791691ab099e5e2ad123536d0fff50652600abaf43bbf952894110d0be"
 dependencies = [
- "windows-core",
+ "windows-core 0.52.0",
+ "windows-targets 0.52.6",
+]
+
+[[package]]
+name = "windows"
+version = "0.54.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9252e5725dbed82865af151df558e754e4a3c2c30818359eb17465f1346a1b49"
+dependencies = [
+ "windows-core 0.54.0",
+ "windows-implement",
+ "windows-interface",
 "windows-targets 0.52.6",
 ]

@@ -2479,12 +2752,53 @@ dependencies = [
 "windows-targets 0.52.6",
 ]

+[[package]]
+name = "windows-core"
+version = "0.54.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "12661b9c89351d684a50a8a643ce5f608e20243b9fb84687800163429f161d65"
+dependencies = [
+ "windows-result",
+ "windows-targets 0.52.6",
+]
+
+[[package]]
+name = "windows-implement"
+version = "0.53.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "942ac266be9249c84ca862f0a164a39533dc2f6f33dc98ec89c8da99b82ea0bd"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.119",
+]
+
+[[package]]
+name = "windows-interface"
+version = "0.53.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "da33557140a288fae4e1d5f8873aaf9eb6613a9cf82c3e070223ff177f598b60"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.119",
+]
+
 [[package]]
 name = "windows-link"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"

+[[package]]
+name = "windows-result"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5e383302e8ec8515204254685643de10811af0ed97ea37210dc26fb0032647f8"
+dependencies = [
+ "windows-targets 0.52.6",
+]
+
 [[package]]
 name = "windows-sys"
 version = "0.45.0"
@@ -2503,6 +2817,15 @@ dependencies = [
 "windows-targets 0.48.5",
 ]

+[[package]]
+name = "windows-sys"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
+dependencies = [
+ "windows-targets 0.52.6",
+]
+
 [[package]]
 name = "windows-sys"
 version = "0.59.0"
@@ -2711,7 +3034,7 @@ dependencies = [
 "bitflags 2.13.2",
 "bytemuck",
 "calloop",
- "cfg_aliases",
+ "cfg_aliases 0.1.1",
 "core-foundation",
 "core-graphics",
 "cursor-icon",
@@ -2895,6 +3218,12 @@ dependencies = [
 "synstructure",
 ]

+[[package]]
+name = "zeroize"
+version = "1.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e13c156562582aa81c60cb29407084cdb54c4164760106ab78e6c5b0858cf64e"
+
 [[package]]
 name = "zerotrie"
 version = "0.2.5"
@@ -1,7 +1,12 @@
 [package]
 name = "ink-notes"
-version = "0.1.0"
+version = "0.1.1"
 edition = "2021"
+description = "Latenzoptimierte Vektor-Notizbuch- und Inking-Anwendung für Linux"
+repository = "https://gitea.pansi.eu/harald/ink-notes"
+license = "MIT"
+readme = "README.md"
+rust-version = "1.75"

 [dependencies]
 # Fenster- & Event-Handling (Wayland/X11, Stylus)
@@ -29,6 +34,11 @@ egui = "0.27"
 egui-wgpu = "0.27"
 egui-winit = { version = "0.27", default-features = false, features = ["links"] }
 webbrowser = "0.8"
+semver = "1.0"
+sha2 = "0.10"
+ureq = { version = "2.10", default-features = false, features = ["tls", "gzip", "json"] }
+url = "2.5"
+octotablet = "0.1.0"

 [profile.dev]
 opt-level = 1 # Erhöht Rendering-Performance auch im Debug-Modus
@@ -37,6 +47,7 @@ opt-level = 1 # Erhöht Rendering-Performance auch im Debug-Modus
 lto = true
 codegen-units = 1
 opt-level = 3
+strip = true

 [dev-dependencies]
 tempfile = "3.27.0"
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 Harald Pansi
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
@@ -10,9 +10,10 @@ Eine latenzoptimierte, hardwarebeschleunigte Inking- und Notizbuch-Anwendung fü

 ### ⚡ Latenzoptimierte Inking-Pipeline
 - **Hardware-Rendering:** Direct-to-Screen-Rendering mit `wgpu` (Vulkan / X11 / Wayland) unter Nutzung von `PresentMode::Mailbox` für minimale Eingabeverzögerung.
- **1€-Filter (One-Euro-Filter):** Dynamischer Tiefpassfilter zur Glättung von Zittern bei langsamen Bewegungen ohne spürbare Latenz bei schnellen Schwüngen.
+- **Zwei-Stufen-Modell:**
+  1. *Live-Phase:* Eingehende Stylus-Samples werden in Echtzeit durch einen 1€-Filter (One-Euro-Filter) entprellt und inkrementell als GPU-Meshes dargestellt.
+  2. *Commit-Phase (Post-Stroke Finalisierung):* Akausale Ecken-Erkennung (Corner Preservation bei Knicken > 65°), gewichtetes 3-Punkt-Druckfenster, Ramer-Douglas-Peucker (RDP) Dezimierung und saubere runde Endkappen.
 - **Centripetal Catmull-Rom Splines:** Weiche C1-stetige Kurveninterpolation ohne Überschwinger oder Schleifen.
- **Drucksensitive Dreiecksstreifen-Tessellierung:** Rechnerische Generierung von Triangle-Meshes mit winkelhalbierenden Normalenvektoren entlang des Pfads.
 - **Werkzeuge:**
  - **Stift (Pen):** Feine, variable Strichstärken (0.3 mm bis 1.2 mm) mit Notiz-Farben (Schwarz, Blau, Rot, Grün, Grau).
  - **Textmarker (Highlighter):** Breite, halbtransparente Striche (4.0 mm bis 8.0 mm) mit Multiplikations-Blending.
@@ -29,7 +30,7 @@ Eine latenzoptimierte, hardwarebeschleunigte Inking- und Notizbuch-Anwendung fü
  - **Geraden (Line):** Sehnen- zu Pfadlängenverhältnis > 0.92.
  - **Rechtecke (Rectangle):** 4 orthogonale Ecken via Douglas-Peucker-Polygonzug (RDP).
  - **Kreise & Ellipsen (Circle/Ellipse):** Geschlossene Pfade mit minimaler Varianz via Least-Squares Circle Fit.
-  - **Koordinatensysteme (Axes):** Zwei orthogonale Achsen (80°–100° gesnappt auf exakt 90°) mit optionalen Richtungspfeilen.
+  - **Koordinatensysteme (Axes):** Zwei orthogonale Achsen (80°–100° gesnappt auf exakt 90°) mit Richtungspfeilen.
  - **Dreiecke, Rhomben / Rauten & Oktaeder:** Regelmäßige Polygone mit Eckpunkt-Analyse.
 - **Interaktionsmodelle:**
  - **Draw-and-Hold:** Verweilt der Stift am Ende eines Strichs für > 400 ms regungslos (< 3 px), snappt die Skizze sofort automatisch in eine perfekte Vektorform ein.
@@ -46,93 +47,141 @@ Eine latenzoptimierte, hardwarebeschleunigte Inking- und Notizbuch-Anwendung fü

 ### 📚 Multi-Dokumenten- & Notizbuch-Verwaltung
 - **Dateisystem-Architektur:** Jedes Dokument wird in einem separaten Verzeichnis unter `~/.local/share/ink-notes/notebooks/<id>/` mit `manifest.json` und Einzelseiten (`page_<id>.json`) gespeichert.
- **Dokumenten-Manager:** Dunkles Glassmorphism-Modal direkt in der Toolbar:
-  - Neues Notizbuch anlegen.
-  - Zwischen Notizbüchern mit einem Klick wechseln.
-  - Dokumente direkt umbenennen (`✏`).
-  - Dokumente löschen (`🗑`).
+- **Dokumenten-Manager:** Toolbar-Modal zum Anlegen, Wechseln, Umbenennen und Löschen von Notizbüchern.
 - **Verlustfreier Wechsel:** Beim Dokumentenwechsel sichert ein synchroner Disk-Flush alle anstehenden Änderungen garantiert ab.

 ### 📄 Seiten & Hintergründe
 - **Virtuelles DIN-A4-Raster:** 2100 × 2970 Koordinateneinheiten (10 Einheiten = 1 mm).
- **Hintergrundmuster:**
-  - Blanko
-  - Kariert (5 mm Raster)
-  - Liniert (7.5 mm Zeilenabstand)
-  - Punktraster (5 mm Dot-Grid)
+- **Hintergrundmuster:** Blanko, Kariert (5 mm), Liniert (7.5 mm), Punktraster (5 mm).
 - **Seitenverwaltung:** Vor- und Zurückblättern, neue Seiten anfügen, Seitensprung-Menü.

 ### 💾 Autosave & Persistenz
- **Asynchroner Autosave-Controller:** Sichert Änderungen im Hintergrund-Thread nach 1.5 s Ruhezeit (Debounce), ohne das Zeichnen zu blockieren.
+- **Asynchroner Autosave-Controller:** Sichert Änderungen im Hintergrund nach 1.5 s Ruhezeit (Debounce), ohne das Zeichnen zu blockieren.
 - **Atomares Schreiben:** Temp-Dateien mit atomarem Rename (`manifest.json.tmp` -> `manifest.json`) schützen vor Datenkorruption bei Abstürzen.
- **Sicherer Shutdown:** `ESC` oder Schließen des Fensters führt vor Programmende einen vollständigen synchronen Flush aus.
+- **Dediziertes Speichern (`Strg + S`):** Sofortiger, synchroner Disk-Flush mit visueller Toast-Rückmeldung.
+- **Sicherer Shutdown:** `Strg + Q` oder Schließen des Fensters führt vor Programmende einen vollständigen synchronen Flush aus.

 ### 🖨️ Vektor-PDF-Export
- Exportiert das gesamte Dokument via `printpdf` nach `./export.pdf`.
- Striche und geometrische Formen werden als skalierbare Vektoren ausgegeben.
+- Exportiert das Dokument via `printpdf` nach `~/Documents/<Titel>.pdf` (mit automatischer Kollisionsvermeidung `_1`, `_2`).
+- Striche und geometrische Formen werden als skalierbare Vektoren ausgegeben. Kürzel: `Strg + E`.

 ---

-### 🚀 Release, Packaging & In-App Auto-Update (Zorin OS 18 / Ubuntu)
- **Natives .deb-Paket**: Optimiert für Zorin OS 18 (Ubuntu 24.04 LTS Noble-Basis) mit vollständiger XDG Desktop-Integration (`.desktop`, Hicolor-Icons SVG & 256x256 PNG, AppStream Metainfo).
- **Portables .AppImage**: Eigenständiges, distributionsunabhängiges Bundle (x86_64) mit integrierten Laufzeitabhängigkeiten.
- **In-App Gitea Updater (`src/updater.rs`)**:
-  - Fragt im Hintergrund die Gitea Releases API (`https://gitea.pansi.eu/api/v1/repos/harald/ink-notes/releases/latest`) ab.
-  - Zeigt bei neuen Versionen ein Update-Badge in der Toolbar an.
-  - Release-Modal mit Versionsvergleich, Changelog und 1-Click-Download / In-Place-Aktualisierung.
- **Gitea Actions CI/CD (`.gitea/workflows/release.yaml`)**: Automatisches Paketieren und Veröffentlichen auf Gitea bei Git-Tags (`v*`).
+## 📦 Release, Packaging & Updater

---
-
-## 📦 Paketierung & Installation (Zorin OS 18)
+- **Natives .deb-Paket**: Optimiert für Zorin OS 18 (Ubuntu 24.04 LTS Basis) mit vollständiger XDG Desktop-Integration (`.desktop`, Hicolor-Icons SVG & PNG, AppStream Metainfo, Debian Copyright & Changelog).
+- **Portables .AppImage**: Eigenständiges x86_64 Bundle.
+- **In-App Updater (`src/updater.rs`)**: Automatischer Prüflauf gegen Gitea Releases, SemVer-Filterung, SHA-256-Prüfung und atomarer In-Place Austausch.

 ### 1. Release-Pakete bauen

 ```bash
-# Baut sowohl .deb als auch .AppImage und berechnet SHA256SUMS.txt in target/
+# Baut .deb, .AppImage und berechnet SHA256SUMS.txt in target/
 ./scripts/build-release.sh
 ```

 Ergebnis in `target/`:
- `ink-notes_0.1.0_amd64.deb` (~4.2 MB)
- `ink-notes_0.1.0_x86_64.AppImage` (~5.6 MB)
+- `ink-notes_0.1.0_amd64.deb`
+- `ink-notes_0.1.0_x86_64.AppImage`
 - `SHA256SUMS.txt`

-### 2. Installation auf Zorin OS 18
+### 2. Installation auf Zorin OS 18 / Ubuntu 24.04

 ```bash
 # Natives Debian-Paket installieren
 sudo dpkg -i target/ink-notes_0.1.0_amd64.deb

-# Oder portables AppImage direkt starten
+# Oder portables AppImage starten
 chmod +x target/ink-notes_0.1.0_x86_64.AppImage
 ./target/ink-notes_0.1.0_x86_64.AppImage
 ```

-Nach der `.deb`-Installation ist `ink-notes` nahtlos im Zorin OS Anwendungsmenü unter *Büro* und *Grafik* integriert.
+#### Hinweise zu AppImage, glibc & FUSE:
+- **glibc-Mindestversion:** `ink-notes` benötigt `glibc >= 2.39` (Standard unter Ubuntu 24.04 LTS und Zorin OS 18).
+- **Host-Grafikstack:** Das AppImage bündelt die Anwendungslogik, nutzt für maximale Performance und Hardwarebeschleunigung jedoch den Treiber- und Grafikstack des Host-Systems (Vulkan ICD-Treiber, Wayland bzw. X11).
+- **FUSE 2 / FUSE 3 Kompatibilität:** Ubuntu 24.04-basierte Distributionen nutzen standardmäßig FUSE 3 (`fuse3`). Sollte das AppImage beim Start einen Fehler bezüglich `libfuse.so.2` ausgeben, kann entweder das Kompatibilitätspaket installiert werden:
+  ```bash
+  sudo apt install libfuse2t64
+  ```
+  oder das AppImage direkt ohne FUSE entpackt und ausgeführt werden:
+  ```bash
+  ./ink-notes_0.1.0_x86_64.AppImage --appimage-extract-and-run
+  ```

 ### 3. Release auf Gitea veröffentlichen

+Das Skript arbeitet vollkommen idempotent und aktualisiert bei wiederholter Ausführung Release-Notizen und Assets:
+
 ```bash
-# Veröffentlicht die Artefakte auf https://gitea.pansi.eu/harald/ink-notes
-./scripts/publish-gitea-release.sh <DEIN_GITEA_TOKEN>
+export GITEA_TOKEN="<DEIN_GITEA_TOKEN>"
+./scripts/publish-gitea-release.sh
 ```

 ---

+## 🛡️ Updater-Sicherheit
+
+Der In-App-Updater (`src/updater.rs`) folgt strengen Sicherheitsrichtlinien:
+
+1. **SHA-256-Integritätsprüfung:**
+   - Vor jeder Ausführung oder Installation wird die offizielle Prüfsummendatei `SHA256SUMS.txt` aus dem Release bezogen.
+   - Der SHA-256-Hash des heruntergeladenen Pakets wird berechnet (`sha2`).
+   - Weicht die Prüfsumme ab oder fehlt ein Eintrag, wird die Datei sofort gelöscht und der Installationsvorgang mit Fehlermeldung abgebrochen.
+   - *Hinweis zur Authentizität:* Eine Prüfsumme vom selben Release-Server garantiert Schutz gegen Übertragungsfehler und Datei-Beschädigungen, jedoch keine kryptografische Nicht-Abstreitbarkeit gegenüber einem kompromittierten Server.
+2. **Signatur-Ausblick:**
+   - Die Updater-Architektur enthält Schnittstellen für optionale `.sig`/`.minisig`-Signaturen zur zukünftigen End-to-End-Kryptoverifikation über öffentliche Schlüssel.
+3. **Redirect-Schutz & HTTPS:**
+   - Alle API- und Download-Endpunkte erzwingen standardmäßig HTTPS.
+   - Bei HTTP-Redirects werden sensible Autorisierungs-Header (`Authorization: token ...`) verworfen, sobald die Weiterleitung auf eine andere Origin oder ein externes CDN verweist.
+4. **Isolierter Download-Pfad & Path-Traversal-Schutz:**
+   - Downloads werden in einem isolierten Benutzerverzeichnis abgelegt (`$XDG_CACHE_HOME/ink-notes/updates` bzw. `~/.cache/ink-notes/updates`, Berechtigung `0700`).
+   - Asset-Namen werden sanitisiert: Pfadtrenner (`/`, `\`), Pfadüberquerungen (`..`), Steuerzeichen und leere Dateinamen werden strikt abgewiesen.
+5. **Atomarer AppImage-Tausch:**
+   - Kein direktes Überschreiben laufender Programmdateien per `fs::copy` (verhindert den Linux-Kernel-Fehler *"Text file busy"*).
+   - Die neue Datei wird temporär im selben Verzeichnis angelegt (`<name>.new.<pid>`), mit Ausführungsrechten (`0755`) versehen, das bestehende AppImage als `<name>.bak` gesichert (dessen Fehler nicht ignoriert werden) und anschließend per atomarem `fs::rename` ausgetauscht.
+
+---
+
+## ⚙️ CI-Runner einrichten (Gitea Actions / act_runner)
+
+Der Veröffentlichungs-Workflow liegt unter [`.gitea/workflows/release.yaml`](.gitea/workflows/release.yaml).
+
+### Runner-Label konfigurieren
+Der Workflow nutzt standardmäßig das Runner-Label:
+```yaml
+runs-on: ubuntu-latest
+```
+
+In der Konfigurationsdatei Ihres Gitea `act_runner` (`config.yaml`) muss dieses Label auf ein passendes Container-Image oder den Host gemappt sein:
+```yaml
+runner:
+  labels:
+    - "ubuntu-latest:docker://catthehacker/ubuntu:act-latest"
+    # oder für native Host-Ausführung:
+    # - "ubuntu-latest:host"
+```
+
+### Diagnose & Fehlerbehebung
+Bleibt ein Release-Job auf **"Waiting to run"** hängen:
+1. **Runner online?** Prüfen Sie in Gitea unter *Einstellungen -> Aktionen -> Runner*, ob der `act_runner` aktiv und mit einem grünen Punkt als *Online* markiert ist.
+2. **Label-Übereinstimmung:** Stimmen die im Runner registrierten Labels exakt mit dem `runs-on`-Feld in `.gitea/workflows/release.yaml` überein?
+3. **Rechte:** Der Workflow prüft `if [ "$(id -u)" -ne 0 ]` und setzt `sudo` nur ein, wenn der Runner nicht als `root` läuft. Das verhindert Fehler sowohl in unprivilegierten Host-Umgebungen als auch in Root-Containern.
+
+---
+
 ## 🚀 Schnellstart (Entwicklung)

 ### Voraussetzungen
 - **Rust & Cargo:** Version 1.75 oder neuer (`rustup update stable`)
 - **System-Bibliotheken (Linux):**
  - Vulkan-Treiber (z. B. `mesa-vulkan-drivers` oder proprietäre Treiber)
-  - X11 / XWayland Bibliotheken (`libx11-dev`, `libxcursor-dev`, `libxrandr-dev`, `libxi-dev`, `libxkbcommon-dev`)
+  - X11 / Wayland Bibliotheken (`libx11-dev`, `libxcursor-dev`, `libxrandr-dev`, `libxi-dev`, `libxkbcommon-dev`)

 ### Bauen & Ausführen

 ```bash
 # Repository klonen
-git clone gitea@farmersdog.pansi.eu:harald/ink-notes.git
+git clone https://gitea.pansi.eu/harald/ink-notes.git
 cd ink-notes

 # Kompilieren und starten via Starter-Skript
@@ -164,8 +213,10 @@ cargo run --release
 | **Nächste Seite** | `Bild ab (PageDown)` oder `N` |
 | **Vorherige Seite** | `Bild auf (PageUp)` |
 | **Erste / Letzte Seite** | `Pos 1 (Home)` / `Ende (End)` |
-| **PDF-Export** | `Strg + E` oder `Strg + S` |
-| **Beenden (mit Disk-Flush)** | `Esc` oder `Q` |
+| **Jetzt speichern (Disk Flush)** | `Strg + S` |
+| **Vektor-PDF-Export** | `Strg + E` |
+| **Dialoge / Menüs schließen** | `Esc` |
+| **Beenden (mit Disk-Flush)** | `Strg + Q` (oder Fenster schließen) |

 ---

@@ -179,7 +230,7 @@ src/
 ├── viewport.rs     # Kamera-Pan, Zoom, 2D-Transformationsmatrizen
 ├── shader.wgsl     # WGSL Vertex- & Fragment-Shader für Inking-Meshes
 ├── filter.rs       # One-Euro-Filter gegen Eingabe-Jitter
-├── spline.rs       # Centripetal Catmull-Rom & Dreiecksstreifen-Tessellierung
+├── spline.rs       # Catmull-Rom, Corner Preservation & Dreiecksstreifen
 ├── geometry.rs     # RDP-Algorithmus, Least-Squares Circle Fit, Shape Recognition
 ├── selection.rs    # Lasso-Auswahl, Bounding-Box, Griffe, Rotation & Skalierung
 ├── background.rs   # Tessellierung für Kariert, Liniert, Punktraster
@@ -187,7 +238,7 @@ src/
 ├── history.rs      # Undo/Redo-Transaktionsstapel (Add, Erase, Transform)
 ├── storage.rs      # Atomares Laden/Speichern von Manifest & Seiten, Multi-Notebooks
 ├── autosave.rs     # Debounced Hintergrund-Autosave mit MPSC-Kanal
-├── updater.rs      # In-App Gitea Updater (SemVer, Release-API, Download, Self-Update)
+├── updater.rs      # In-App Gitea Updater (SemVer, HTTPS, SHA256-Integrität, Self-Update)
 ├── export.rs       # Skalierbarer Vektor-PDF-Export via printpdf
 └── ui.rs           # Floating Glassmorphism-Toolbar, Dokumenten- & Update-Manager (egui)
 ```
@@ -198,16 +249,16 @@ Ausführliche Details zur Architektur und mathematischen Modellen findest du unt

 ## 🧪 Tests ausführen

-Die gesamte Inking-Pipeline, Geometrieerkennung, Speicherlogik und der Updater sind mit Unit-Tests abgesichert:
+Die gesamte Inking-Pipeline, Geometrieerkennung, Speicherlogik und der Updater sind mit umfassenden Unit-Tests abgesichert:

 ```bash
 cargo test
 ```

-Alle 61 Unit-Tests prüfen Berechnungen, Hit-Testing, Undo/Redo, Persistenz und Versionsvergleiche konsistent ab.
+Alle Unit-Tests prüfen Berechnungen, Hit-Testing, Undo/Redo, Persistenz, Updater-Sicherheit und Versionsvergleiche konsistent ab.

 ---

 ## 📄 Lizenz

-MIT License / Open Source Inking Project for Linux.
+Dieses Projekt ist unter der [MIT-Lizenz](LICENSE) lizenziert (Copyright © 2026 Harald Pansi).
@@ -0,0 +1,18 @@
+[Desktop Entry]
+Version=1.0
+Name=ink-notes
+GenericName=Notizbuch- & Inking-App
+Comment=Latenzoptimierte Vektor-Notizen mit Stylus, Stift & Geometrie-Erkennung
+Exec=ink-notes %F
+Icon=eu.pansi.ink-notes
+Terminal=false
+Type=Application
+Categories=Office;Graphics;Utility;
+Keywords=Note;Notiz;Pen;Stift;Ink;Inking;Stylus;Drawing;Zeichnen;PDF;Vector;
+StartupWMClass=ink-notes
+MimeType=application/x-inknotes;
+Actions=NewWindow;
+
+[Desktop Action NewWindow]
+Name=Neues Fenster
+Exec=ink-notes
@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<component type="desktop-application">
+  <id>eu.pansi.ink-notes</id>
+  <metadata_license>CC0-1.0</metadata_license>
+  <project_license>MIT</project_license>
+  <name>ink-notes</name>
+  <summary>Latenzoptimierte Vektor-Notizbuch- und Inking-App für Linux</summary>
+  <description>
+    <p>
+      ink-notes ist eine hardwarebeschleunigte, hochperformante Notizbuch- und Inking-Anwendung für Linux,
+      geschrieben in Rust mit wgpu. Sie bietet minimale Eingabelatenz mit Stylus, Touchpad oder Maus.
+    </p>
+    <p>Hauptmerkmale:</p>
+    <ul>
+      <li>Zwei-Stufen-Inking-Modell: Echtzeit-Glättung mit 1€-Filter und akausale Ecken-Erhaltung</li>
+      <li>Automatische Geometrie- und Formerkennung (Geraden, Rechtecke, Kreise, Koordinatensysteme, Polygone)</li>
+      <li>Stufenloser Viewport mit cursor-zentriertem Zoom (25% bis 500%) und Panning</li>
+      <li>Objektauswahl, Lasso, Skalieren, stufenloses Drehen und Multicolor-Umfärbung</li>
+      <li>Multi-Dokumenten- und Notizbuch-Verwaltung mit atomarem Autosave</li>
+      <li>Vektor-PDF-Export für Druck und Weitergabe</li>
+    </ul>
+  </description>
+  <launchable type="desktop-id">eu.pansi.ink-notes.desktop</launchable>
+  <provides>
+    <binary>ink-notes</binary>
+  </provides>
+  <categories>
+    <category>Office</category>
+    <category>Graphics</category>
+    <category>Utility</category>
+  </categories>
+  <developer id="eu.pansi">
+    <name>Harald</name>
+  </developer>
+  <url type="homepage">https://gitea.pansi.eu/harald/ink-notes</url>
+  <url type="bugtracker">https://gitea.pansi.eu/harald/ink-notes/issues</url>
+  <content_rating type="oars-1.1" />
+</component>
@@ -4,7 +4,7 @@ Name=ink-notes
 GenericName=Notizbuch- & Inking-App
 Comment=Latenzoptimierte Vektor-Notizen mit Stylus, Stift & Geometrie-Erkennung
 Exec=ink-notes %F
-Icon=ink-notes
+Icon=eu.pansi.ink-notes
 Terminal=false
 Type=Application
 Categories=Office;Graphics;Utility;
@@ -20,7 +20,7 @@
      <li>Vektor-PDF-Export für Druck und Weitergabe</li>
    </ul>
  </description>
-  <launchable type="desktop-id">ink-notes.desktop</launchable>
+  <launchable type="desktop-id">eu.pansi.ink-notes.desktop</launchable>
  <provides>
    <binary>ink-notes</binary>
  </provides>
@@ -32,7 +32,7 @@
  <developer id="eu.pansi">
    <name>Harald</name>
  </developer>
-  <url type="homepage">https://farmersdog.pansi.eu/harald/ink-notes</url>
-  <url type="bugtracker">https://farmersdog.pansi.eu/harald/ink-notes/issues</url>
+  <url type="homepage">https://gitea.pansi.eu/harald/ink-notes</url>
+  <url type="bugtracker">https://gitea.pansi.eu/harald/ink-notes/issues</url>
  <content_rating type="oars-1.1" />
 </component>
@@ -0,0 +1,23 @@
+## ink-notes {{TAG_NAME}}
+
+Latenzoptimierte Vektor-Notizbuch- und Inking-Anwendung für Linux (Zorin OS 18 / Ubuntu 24.04).
+
+### Highlights:
+- **Aktive Stylus-Unterstützung (Lazarite / MPP / AES)**: Natives Wayland-Tablet-Protokoll mit präziser Druck- und Neigungserfassung
+- **Touchscreen Multi-Touch**: Stufenloses 2-Finger Pinch-to-Zoom und Panning mit umschaltbarem Finger-Zeichenmodus
+- **Zwei-Stufen-Inking-Modell**: Kausale Echtzeit-Glättung via 1€-Filter & akausale Ecken-Erhaltung (Corner Preservation)
+- **Geometrie- und Formerkennung**: Geraden, Rechtecke, Kreise, Rauten, Polygone & Koordinatensysteme (Draw-and-Hold)
+- **Multi-Dokumenten-Manager**: Unbegrenzte Notizbücher mit atomarem Autosave
+- **In-App Updater**: Automatische Versionsprüfung und sichere Atomar-Aktualisierung via Gitea Releases
+- **Vektor-PDF-Export**: Verlustfreie Ausgabe für Druck und Weitergabe
+
+### Installation:
+- **Zorin OS / Ubuntu / Debian (.deb)**:
+  ```bash
+  sudo dpkg -i ink-notes_{{VERSION}}_amd64.deb
+  ```
+- **Portables AppImage (Alle Linux-Distributionen)**:
+  ```bash
+  chmod +x ink-notes_{{VERSION}}_x86_64.AppImage
+  ./ink-notes_{{VERSION}}_x86_64.AppImage
+  ```
@@ -18,11 +18,22 @@ APPDIR="${ROOT_DIR}/target/AppDir"
 CACHE_DIR="${ROOT_DIR}/target/tools"
 APPIMAGETOOL="${CACHE_DIR}/appimagetool-x86_64.AppImage"

+# Pinned appimagetool Release & SHA-256 Hash
+APPIMAGETOOL_VERSION="1.9.1"
+APPIMAGETOOL_URL="https://github.com/AppImage/appimagetool/releases/download/${APPIMAGETOOL_VERSION}/appimagetool-x86_64.AppImage"
+APPIMAGETOOL_SHA256="ed4ce84f0d9caff66f50bcca6ff6f35aae54ce8135408b3fa33abfc3cb384eb0"
+
 echo "=== [1/5] Stelle Release-Binary sicher (ink-notes v${VERSION}) ==="
 if [ ! -f "target/release/ink-notes" ]; then
    cargo build --release
 fi

+# Prüfe glibc-Mindestversion
+echo "=== Prüfe glibc-Symbolversionen ==="
+MAX_GLIBC=$(objdump -T "target/release/ink-notes" | grep "GLIBC_" | sed -e 's/.*GLIBC_//' | cut -d')' -f1 | sort -V | tail -n 1 || echo "unknown")
+echo "Höchste benötigte glibc-Symbolversion: GLIBC_${MAX_GLIBC}"
+echo "Hinweis: ink-notes nutzt den Host-Grafikstack (Vulkan ICD, Wayland/X11) und glibc >= ${MAX_GLIBC}."
+
 # Sicherstellen, dass das PNG-Icon existiert
 if [ ! -f "assets/ink-notes.png" ]; then
    echo "Generiere PNG-Icon..."
@@ -41,15 +52,20 @@ mkdir -p "${APPDIR}/usr/share/metainfo"
 cp "target/release/ink-notes" "${APPDIR}/usr/bin/ink-notes"
 chmod 755 "${APPDIR}/usr/bin/ink-notes"

-cp "packaging/ink-notes.desktop" "${APPDIR}/usr/share/applications/ink-notes.desktop"
-cp "packaging/ink-notes.desktop" "${APPDIR}/ink-notes.desktop"
+# Desktop-Datei
+cp "packaging/eu.pansi.ink-notes.desktop" "${APPDIR}/usr/share/applications/eu.pansi.ink-notes.desktop"
+cp "packaging/eu.pansi.ink-notes.desktop" "${APPDIR}/eu.pansi.ink-notes.desktop"
+ln -sf "eu.pansi.ink-notes.desktop" "${APPDIR}/ink-notes.desktop"

-cp "assets/ink-notes.svg" "${APPDIR}/usr/share/icons/hicolor/scalable/apps/ink-notes.svg"
-cp "assets/ink-notes.png" "${APPDIR}/usr/share/icons/hicolor/256x256/apps/ink-notes.png"
-cp "assets/ink-notes.png" "${APPDIR}/ink-notes.png"
-ln -sf "ink-notes.png" "${APPDIR}/.DirIcon"
+# Icons
+cp "assets/ink-notes.svg" "${APPDIR}/usr/share/icons/hicolor/scalable/apps/eu.pansi.ink-notes.svg"
+cp "assets/ink-notes.png" "${APPDIR}/usr/share/icons/hicolor/256x256/apps/eu.pansi.ink-notes.png"
+cp "assets/ink-notes.png" "${APPDIR}/eu.pansi.ink-notes.png"
+ln -sf "eu.pansi.ink-notes.png" "${APPDIR}/.DirIcon"

-cp "packaging/ink-notes.metainfo.xml" "${APPDIR}/usr/share/metainfo/eu.pansi.ink-notes.metainfo.xml"
+# Metainfo
+cp "packaging/eu.pansi.ink-notes.metainfo.xml" "${APPDIR}/usr/share/metainfo/eu.pansi.ink-notes.metainfo.xml"
+cp "packaging/eu.pansi.ink-notes.metainfo.xml" "${APPDIR}/usr/share/metainfo/eu.pansi.ink-notes.appdata.xml"

 # AppRun Skript erstellen
 cat <<'EOF' > "${APPDIR}/AppRun"
@@ -62,11 +78,32 @@ exec "${SELF_DIR}/usr/bin/ink-notes" "$@"
 EOF
 chmod 755 "${APPDIR}/AppRun"

-echo "=== [3/5] Hole appimagetool (gecacht in ${CACHE_DIR}) ==="
+echo "=== [3/5] Hole & verifiziere gepinntes appimagetool v${APPIMAGETOOL_VERSION} ==="
 mkdir -p "${CACHE_DIR}"
-if [ ! -f "${APPIMAGETOOL}" ]; then
-    echo "Lade appimagetool herunter..."
-    curl -fsSL -o "${APPIMAGETOOL}" "https://github.com/AppImage/appimagetool/releases/download/continuous/appimagetool-x86_64.AppImage"
+
+need_download=true
+if [ -f "${APPIMAGETOOL}" ]; then
+    CURRENT_HASH=$(sha256sum "${APPIMAGETOOL}" | cut -d' ' -f1)
+    if [ "${CURRENT_HASH}" = "${APPIMAGETOOL_SHA256}" ]; then
+        need_download=false
+    else
+        echo "Gecachtes appimagetool hat ungültigen Hash. Lade neu herunter..."
+        rm -f "${APPIMAGETOOL}"
+    fi
+fi
+
+if [ "${need_download}" = true ]; then
+    echo "Lade appimagetool v${APPIMAGETOOL_VERSION} herunter..."
+    curl -fsSL -o "${APPIMAGETOOL}.tmp" "${APPIMAGETOOL_URL}"
+    DOWNLOAD_HASH=$(sha256sum "${APPIMAGETOOL}.tmp" | cut -d' ' -f1)
+    if [ "${DOWNLOAD_HASH}" != "${APPIMAGETOOL_SHA256}" ]; then
+        echo "FEHLER: SHA256-Prüfsumme für appimagetool stimmt nicht überein!"
+        echo "Erwartet: ${APPIMAGETOOL_SHA256}"
+        echo "Erhalten: ${DOWNLOAD_HASH}"
+        rm -f "${APPIMAGETOOL}.tmp"
+        exit 1
+    fi
+    mv "${APPIMAGETOOL}.tmp" "${APPIMAGETOOL}"
    chmod +x "${APPIMAGETOOL}"
 fi

@@ -16,7 +16,7 @@ ARCH="amd64"
 DEB_NAME="${PKG_NAME}_${VERSION}_${ARCH}.deb"
 STAGING_DIR="${ROOT_DIR}/target/deb_staging"

-echo "=== [1/4] Baue Release-Binary mit Cargo (ink-notes v${VERSION}) ==="
+echo "=== [1/5] Baue Release-Binary mit Cargo (ink-notes v${VERSION}) ==="
 cargo build --release

 # Sicherstellen, dass das PNG-Icon existiert
@@ -25,7 +25,23 @@ if [ ! -f "assets/ink-notes.png" ]; then
    python3 scripts/generate_png_icon.py
 fi

-echo "=== [2/4] Erstelle Paketstruktur in ${STAGING_DIR} ==="
+echo "=== [2/5] Ermittle tatsächliche Abhängigkeiten (ldd & dpkg-shlibdeps) ==="
+echo "Linker-Abhängigkeiten (ldd):"
+ldd target/release/ink-notes
+
+if command -v dpkg-shlibdeps >/dev/null 2>&1; then
+    echo "Ermittle automatische shlibdeps via dpkg-shlibdeps..."
+    TEMP_CONTROL_DIR="$(mktemp -d)"
+    mkdir -p "${TEMP_CONTROL_DIR}/debian"
+    echo "Source: ${PKG_NAME}" > "${TEMP_CONTROL_DIR}/debian/control"
+    (
+        cd "${TEMP_CONTROL_DIR}"
+        dpkg-shlibdeps -O "${ROOT_DIR}/target/release/ink-notes" 2>/dev/null || true
+    )
+    rm -rf "${TEMP_CONTROL_DIR}"
+fi
+
+echo "=== [3/5] Erstelle Paketstruktur in ${STAGING_DIR} ==="
 rm -rf "${STAGING_DIR}"
 mkdir -p "${STAGING_DIR}/DEBIAN"
 mkdir -p "${STAGING_DIR}/usr/bin"
@@ -33,44 +49,104 @@ mkdir -p "${STAGING_DIR}/usr/share/applications"
 mkdir -p "${STAGING_DIR}/usr/share/icons/hicolor/scalable/apps"
 mkdir -p "${STAGING_DIR}/usr/share/icons/hicolor/256x256/apps"
 mkdir -p "${STAGING_DIR}/usr/share/metainfo"
+mkdir -p "${STAGING_DIR}/usr/share/doc/${PKG_NAME}"

-# 2. Dateien kopieren
+# Dateien kopieren
 cp "target/release/ink-notes" "${STAGING_DIR}/usr/bin/ink-notes"
+
+# Desktop-Dateien (sowohl mit AppStream ID als auch Legacy Name)
+cp "packaging/eu.pansi.ink-notes.desktop" "${STAGING_DIR}/usr/share/applications/eu.pansi.ink-notes.desktop"
+cp "packaging/eu.pansi.ink-notes.desktop" "${STAGING_DIR}/usr/share/applications/ink-notes.desktop"
+
+# Icons (eu.pansi.ink-notes & ink-notes)
+cp "assets/ink-notes.svg" "${STAGING_DIR}/usr/share/icons/hicolor/scalable/apps/eu.pansi.ink-notes.svg"
+cp "assets/ink-notes.svg" "${STAGING_DIR}/usr/share/icons/hicolor/scalable/apps/ink-notes.svg"
+cp "assets/ink-notes.png" "${STAGING_DIR}/usr/share/icons/hicolor/256x256/apps/eu.pansi.ink-notes.png"
+cp "assets/ink-notes.png" "${STAGING_DIR}/usr/share/icons/hicolor/256x256/apps/ink-notes.png"
+
+# AppStream Metainfo
+cp "packaging/eu.pansi.ink-notes.metainfo.xml" "${STAGING_DIR}/usr/share/metainfo/eu.pansi.ink-notes.metainfo.xml"
+
+# Debian doc: copyright
+cat <<'EOF' > "${STAGING_DIR}/usr/share/doc/ink-notes/copyright"
+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Upstream-Name: ink-notes
+Upstream-Contact: Harald <harald@pansi.eu>
+Source: https://gitea.pansi.eu/harald/ink-notes
+
+Files: *
+Copyright: 2026 Harald Pansi <harald@pansi.eu>
+License: MIT
+
+License: MIT
+ Permission is hereby granted, free of charge, to any person obtaining a copy
+ of this software and associated documentation files (the "Software"), to deal
+ in the Software without restriction, including without limitation the rights
+ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ copies of the Software, and to permit persons to whom the Software is
+ furnished to do so, subject to the following conditions:
+ .
+ The above copyright notice and this permission notice shall be included in all
+ copies or substantial portions of the Software.
+ .
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ SOFTWARE.
+EOF
+
+# Debian doc: changelog.gz
+CHANGELOG_TMP="$(mktemp)"
+cat <<EOF > "${CHANGELOG_TMP}"
+ink-notes (${VERSION}-1) stable; urgency=medium
+
+  * Release v${VERSION}.
+  * Low-latency vector inking with two-stage pipeline.
+  * Shape recognition and infinite canvas with zoom/pan.
+  * Multi-notebook management and PDF export.
+
+ -- Harald <harald@pansi.eu>  $(date -R)
+EOF
+gzip -n -9 -c "${CHANGELOG_TMP}" > "${STAGING_DIR}/usr/share/doc/ink-notes/changelog.gz"
+rm -f "${CHANGELOG_TMP}"
+
+# Berechtigungen penibel setzen
+find "${STAGING_DIR}" -type d -exec chmod 755 {} +
+find "${STAGING_DIR}/usr/share" -type f -exec chmod 644 {} +
+chmod 755 "${STAGING_DIR}/DEBIAN"
 chmod 755 "${STAGING_DIR}/usr/bin/ink-notes"

-cp "packaging/ink-notes.desktop" "${STAGING_DIR}/usr/share/applications/ink-notes.desktop"
-chmod 644 "${STAGING_DIR}/usr/share/applications/ink-notes.desktop"
-
-cp "assets/ink-notes.svg" "${STAGING_DIR}/usr/share/icons/hicolor/scalable/apps/ink-notes.svg"
-chmod 644 "${STAGING_DIR}/usr/share/icons/hicolor/scalable/apps/ink-notes.svg"
-
-cp "assets/ink-notes.png" "${STAGING_DIR}/usr/share/icons/hicolor/256x256/apps/ink-notes.png"
-chmod 644 "${STAGING_DIR}/usr/share/icons/hicolor/256x256/apps/ink-notes.png"
-
-cp "packaging/ink-notes.metainfo.xml" "${STAGING_DIR}/usr/share/metainfo/eu.pansi.ink-notes.metainfo.xml"
-chmod 644 "${STAGING_DIR}/usr/share/metainfo/eu.pansi.ink-notes.metainfo.xml"
-
-# 3. DEBIAN/control Datei generieren
+# DEBIAN/control Datei generieren
 cat <<EOF > "${STAGING_DIR}/DEBIAN/control"
 Package: ${PKG_NAME}
 Version: ${VERSION}
 Architecture: ${ARCH}
 Maintainer: Harald <harald@pansi.eu>
 Installed-Size: $(du -ks "${STAGING_DIR}/usr" | cut -f1)
-Depends: libc6, libx11-6, libxcursor1, libxrandr2, libxi6, libxkbcommon0
+Depends: libc6 (>= 2.38), libgcc-s1, libvulkan1, mesa-vulkan-drivers | vulkan-icd, libwayland-client0, libx11-6, libxcursor1, libxrandr2, libxi6, libxkbcommon0, xdg-utils
 Section: utils
 Priority: optional
-Homepage: https://farmersdog.pansi.eu/harald/ink-notes
+Homepage: https://gitea.pansi.eu/harald/ink-notes
 Description: Latenzoptimierte Vektor-Notizbuch- und Inking-App für Linux
 ink-notes kombiniert minimale Stylus-Latenz mit GPU-Hardwarebeschleunigung (wgpu),
 stufenlosem Viewport, Geometrie- und Formerkennung, Objekt-Transformationen,
 Multi-Dokumenten-Verwaltung und Vektor-PDF-Export.
 EOF
+chmod 644 "${STAGING_DIR}/DEBIAN/control"

-echo "=== [3/4] Schnüre .deb-Paket mit dpkg-deb ==="
+echo "=== [4/5] Schnüre .deb-Paket mit dpkg-deb ==="
 dpkg-deb --build --root-owner-group "${STAGING_DIR}" "${ROOT_DIR}/target/${DEB_NAME}"

-echo "=== [4/4] Paket erfolgreich erstellt: target/${DEB_NAME} ==="
+echo "=== [5/5] Paket erfolgreich erstellt: target/${DEB_NAME} ==="
 ls -lh "${ROOT_DIR}/target/${DEB_NAME}"
 dpkg-deb -I "${ROOT_DIR}/target/${DEB_NAME}"
+
+if command -v lintian >/dev/null 2>&1; then
+    echo "=== Prüfe Paket mit lintian ==="
+    lintian "${ROOT_DIR}/target/${DEB_NAME}" || true
+fi
+
 echo "Fertig!"
@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 # ==============================================================================
 # Veröffentlicht ein Release auf dem Gitea-Server (gitea.pansi.eu)
-# Lädt .deb, .AppImage und SHA256SUMS.txt als Release-Assets hoch.
+# Lädt .deb, .AppImage und SHA256SUMS.txt idempotent als Release-Assets hoch.
 # ==============================================================================
 set -euo pipefail

@@ -14,13 +14,15 @@ GITEA_SERVER="${GITEA_SERVER:-https://gitea.pansi.eu}"
 REPO_OWNER="${REPO_OWNER:-harald}"
 REPO_NAME="${REPO_NAME:-ink-notes}"

-# Token aus Argument oder Umgebungsvariablen ermitteln
-TOKEN="${1:-${INK_NOTES_GITEA_TOKEN:-${GITEA_TOKEN:-${GITHUB_TOKEN:-}}}}"
+# Token ausschließlich aus Umgebungsvariablen ermitteln (Fallback für Legacy-Aufruf mit Argument)
+TOKEN="${INK_NOTES_GITEA_TOKEN:-${GITEA_TOKEN:-${GITHUB_TOKEN:-}}}"
+if [ -z "${TOKEN}" ] && [ -n "${1:-}" ]; then
+    TOKEN="$1"
+fi

 if [ -z "${TOKEN}" ]; then
    echo "FEHLER: Kein Gitea-API-Token angegeben."
-    echo "Verwendung: $0 <GITEA_API_TOKEN>"
-    echo "Oder setze die Umgebungsvariable INK_NOTES_GITEA_TOKEN."
+    echo "Bitte setze die Umgebungsvariable GITEA_TOKEN oder INK_NOTES_GITEA_TOKEN."
    exit 1
 fi

@@ -31,6 +33,12 @@ RELEASE_TITLE="ink-notes ${TAG_NAME}"
 DEB_FILE="${ROOT_DIR}/target/ink-notes_${VERSION}_amd64.deb"
 APPIMAGE_FILE="${ROOT_DIR}/target/ink-notes_${VERSION}_x86_64.AppImage"
 CHECKSUMS_FILE="${ROOT_DIR}/target/SHA256SUMS.txt"
+TEMPLATE_FILE="${ROOT_DIR}/packaging/release-notes.md.tmpl"
+
+if [ ! -f "${TEMPLATE_FILE}" ]; then
+    echo "FEHLER: Release-Template '${TEMPLATE_FILE}' nicht gefunden."
+    exit 1
+fi

 # Sicherstellen, dass die Artefakte existieren
 if [ ! -f "${DEB_FILE}" ] || [ ! -f "${APPIMAGE_FILE}" ] || [ ! -f "${CHECKSUMS_FILE}" ]; then
@@ -42,92 +50,181 @@ echo "======================================================================"
 echo "Veröffentliche Release ${TAG_NAME} auf ${GITEA_SERVER}/${REPO_OWNER}/${REPO_NAME}"
 echo "======================================================================"

-RELEASE_BODY=$(cat <<EOF
-## ink-notes ${TAG_NAME}
-
-Latenzoptimierte Vektor-Notizbuch- und Inking-Anwendung für Linux (Zorin OS 18 / Ubuntu 24.04).
-
-### Highlights:
- **Zwei-Stufen-Inking-Modell**: Kausale Echtzeit-Glättung via 1€-Filter & akausale Ecken-Erhaltung (Corner Preservation)
- **Geometrie- und Formerkennung**: Geraden, Rechtecke, Kreise, Rauten, Polygone & Koordinatensysteme (Draw-and-Hold)
- **Viewport**: Stufenloser Zoom (25% - 500%) und Panning
- **Multi-Dokumenten-Manager**: Unbegrenzte Notizbücher mit atomarem Autosave
- **In-App Updater**: Automatische Versionsprüfung und Aktualisierung via Gitea Releases
- **Vektor-PDF-Export**: Verluste freie Ausgabe für Druck und Weitergabe
-
-### Installation:
- **Zorin OS / Ubuntu / Debian (.deb)**:
-  \`\`\`bash
-  sudo dpkg -i ink-notes_${VERSION}_amd64.deb
-  \`\`\`
- **Portables AppImage (Alle Linux-Distributionen)**:
-  \`\`\`bash
-  chmod +x ink-notes_${VERSION}_x86_64.AppImage
-  ./ink-notes_${VERSION}_x86_64.AppImage
-  \`\`\`
-EOF
-)
-
-# 1. Release via Gitea REST API erstellen (oder ID abfragen, falls bereits existent)
-CREATE_PAYLOAD=$(python3 -c "
-import json, sys
-data = {
-    'tag_name': '${TAG_NAME}',
-    'target_commitish': 'main',
-    'name': '${RELEASE_TITLE}',
-    'body': '''${RELEASE_BODY}''',
-    'draft': False,
-    'prerelease': False
+# 1. Payload robust per Python aus Template erzeugen (verhindert Shell-Escaping-Probleme)
+PAYLOAD_FILE="$(mktemp)"
+CLEANUP_FILES=("${PAYLOAD_FILE}")
+cleanup() {
+    for f in "${CLEANUP_FILES[@]}"; do
+        rm -f "${f}"
+    done
 }
-print(json.dumps(data))
-")
+trap cleanup EXIT
+
+RELEASE_VERSION="${VERSION}" RELEASE_TAG="${TAG_NAME}" RELEASE_TITLE="${RELEASE_TITLE}" \
+python3 -c '
+import json, os, sys
+
+template_path = sys.argv[1]
+with open(template_path, "r", encoding="utf-8") as f:
+    template_content = f.read()
+
+version = os.environ.get("RELEASE_VERSION", "")
+tag = os.environ.get("RELEASE_TAG", "")
+title = os.environ.get("RELEASE_TITLE", "")
+
+body = template_content.replace("{{VERSION}}", version).replace("{{TAG_NAME}}", tag)
+
+payload = {
+    "tag_name": tag,
+    "target_commitish": "main",
+    "name": title,
+    "body": body,
+    "draft": False,
+    "prerelease": False
+}
+print(json.dumps(payload))
+' "${TEMPLATE_FILE}" > "${PAYLOAD_FILE}"

 API_BASE="${GITEA_SERVER}/api/v1/repos/${REPO_OWNER}/${REPO_NAME}"

-echo "Erstelle Release über Gitea API..."
-HTTP_RESPONSE=$(curl -s -w "\nHTTP_STATUS:%{http_code}" \
-    -X POST "${API_BASE}/releases" \
-    -H "Accept: application/json" \
-    -H "Content-Type: application/json" \
-    -H "Authorization: token ${TOKEN}" \
-    -d "${CREATE_PAYLOAD}")
+# 2. Prüfen, ob Release bereits existiert (Idempotenz)
+echo "Prüfe bestehende Releases auf ${GITEA_SERVER}..."
+TAG_RESP_FILE="$(mktemp)"
+CLEANUP_FILES+=("${TAG_RESP_FILE}")

-HTTP_STATUS=$(echo "${HTTP_RESPONSE}" | grep "HTTP_STATUS:" | cut -d':' -f2)
-RESPONSE_BODY=$(echo "${HTTP_RESPONSE}" | sed '/HTTP_STATUS:/d')
+HTTP_STATUS=$(curl -s -S -o "${TAG_RESP_FILE}" -w "%{http_code}" \
+    -X GET "${API_BASE}/releases/tags/${TAG_NAME}" \
+    -H "Accept: application/json" \
+    -H "Authorization: token ${TOKEN}" || echo "000")

 RELEASE_ID=""
-if [ "${HTTP_STATUS}" -eq 201 ]; then
-    RELEASE_ID=$(echo "${RESPONSE_BODY}" | python3 -c "import sys, json; print(json.load(sys.stdin)['id'])")
-    echo "Release erfolgreich angelegt (ID: ${RELEASE_ID})!"
-else
-    echo "Release existiert womöglich bereits (Status ${HTTP_STATUS}). Suche bestehendes Release..."
-    EXISTING_RELEASE=$(curl -fsSL \
-        -H "Accept: application/json" \
-        -H "Authorization: token ${TOKEN}" \
-        "${API_BASE}/releases/tags/${TAG_NAME}" || true)
-    if [ -n "${EXISTING_RELEASE}" ]; then
-        RELEASE_ID=$(echo "${EXISTING_RELEASE}" | python3 -c "import sys, json; print(json.load(sys.stdin).get('id', ''))")
-    fi
-fi

-if [ -z "${RELEASE_ID}" ]; then
-    echo "FEHLER: Konnte Release nicht erstellen oder abfragen. Serverantwort:"
-    echo "${RESPONSE_BODY}"
+if [ "${HTTP_STATUS}" = "200" ]; then
+    RELEASE_ID=$(python3 -c '
+import sys, json
+try:
+    data = json.load(open(sys.argv[1]))
+    print(data.get("id", ""))
+except Exception:
+    pass
+' "${TAG_RESP_FILE}")
+    echo "Release ${TAG_NAME} existiert bereits (ID: ${RELEASE_ID}). Aktualisiere Release-Notizen..."
+    PATCH_STATUS=$(curl -s -S -o /dev/null -w "%{http_code}" \
+        -X PATCH "${API_BASE}/releases/${RELEASE_ID}" \
+        -H "Accept: application/json" \
+        -H "Content-Type: application/json" \
+        -H "Authorization: token ${TOKEN}" \
+        -d @"${PAYLOAD_FILE}" || echo "000")
+    if [ "${PATCH_STATUS}" != "200" ]; then
+        echo "Hinweis: Aktualisierung der Metadaten ergab HTTP ${PATCH_STATUS}."
+    fi
+elif [ "${HTTP_STATUS}" = "404" ]; then
+    echo "Release existiert noch nicht. Erstelle neues Release ${TAG_NAME}..."
+    CREATE_RESP_FILE="$(mktemp)"
+    CLEANUP_FILES+=("${CREATE_RESP_FILE}")
+    CREATE_STATUS=$(curl -s -S -o "${CREATE_RESP_FILE}" -w "%{http_code}" \
+        -X POST "${API_BASE}/releases" \
+        -H "Accept: application/json" \
+        -H "Content-Type: application/json" \
+        -H "Authorization: token ${TOKEN}" \
+        -d @"${PAYLOAD_FILE}" || echo "000")
+
+    if [ "${CREATE_STATUS}" = "201" ]; then
+        RELEASE_ID=$(python3 -c '
+import sys, json
+try:
+    data = json.load(open(sys.argv[1]))
+    print(data.get("id", ""))
+except Exception:
+    pass
+' "${CREATE_RESP_FILE}")
+        echo "Release erfolgreich angelegt (ID: ${RELEASE_ID})!"
+    else
+        echo "FEHLER: Release konnte nicht angelegt werden (HTTP ${CREATE_STATUS})."
+        cat "${CREATE_RESP_FILE}"
+        exit 1
+    fi
+else
+    echo "FEHLER: Unerwartete Serverantwort beim Abfragen des Release-Tags (HTTP ${HTTP_STATUS})."
+    cat "${TAG_RESP_FILE}"
    exit 1
 fi

-# 2. Assets hochladen
+if [ -z "${RELEASE_ID}" ]; then
+    echo "FEHLER: Keine gültige Release-ID ermittelt."
+    exit 1
+fi
+
+# 3. Vorhandene Assets auflisten (um Dubletten vor Upload sauber zu löschen)
+ASSETS_LIST_FILE="$(mktemp)"
+CLEANUP_FILES+=("${ASSETS_LIST_FILE}")
+
+LIST_STATUS=$(curl -s -S -o "${ASSETS_LIST_FILE}" -w "%{http_code}" \
+    -X GET "${API_BASE}/releases/${RELEASE_ID}/assets" \
+    -H "Accept: application/json" \
+    -H "Authorization: token ${TOKEN}" || echo "000")
+
+if [ "${LIST_STATUS}" != "200" ]; then
+    echo "Hinweis: Konnte bestehende Assets nicht abrufen (HTTP ${LIST_STATUS})."
+fi
+
 upload_asset() {
    local file_path="$1"
-    local filename="$(basename "${file_path}")"
+    local filename
+    filename="$(basename "${file_path}")"
+
+    # Asset-Namen in URL URL-kodieren
+    local encoded_name
+    encoded_name=$(python3 -c 'import sys, urllib.parse; print(urllib.parse.quote(sys.argv[1]))' "${filename}")
+
+    # Prüfen, ob bereits Assets mit demselben Namen existieren (können mehrere sein)
+    local existing_ids=()
+    if [ -f "${ASSETS_LIST_FILE}" ] && [ -s "${ASSETS_LIST_FILE}" ]; then
+        mapfile -t existing_ids < <(python3 -c '
+import sys, json
+try:
+    assets = json.load(open(sys.argv[1]))
+    target = sys.argv[2]
+    for a in assets:
+        if a.get("name") == target and a.get("id"):
+            print(a.get("id"))
+except Exception:
+    pass
+' "${ASSETS_LIST_FILE}" "${filename}")
+    fi
+
+    for eid in "${existing_ids[@]}"; do
+        if [ -n "${eid}" ]; then
+            echo "Lösche bestehendes Asset '${filename}' (ID: ${eid}) vor Re-Upload..."
+            local del_status
+            del_status=$(curl -s -S -o /dev/null -w "%{http_code}" \
+                -X DELETE "${API_BASE}/releases/${RELEASE_ID}/assets/${eid}" \
+                -H "Authorization: token ${TOKEN}" || echo "000")
+            if [ "${del_status}" != "204" ] && [ "${del_status}" != "200" ]; then
+                echo "Warnung: Löschen von bestehendem Asset '${filename}' ergab HTTP ${del_status}."
+            fi
+        fi
+    done
+
    echo "Lade Asset hoch: ${filename}..."
-    curl -fsSL \
-        -X POST "${API_BASE}/releases/${RELEASE_ID}/assets?name=${filename}" \
+    local upload_res_file="$(mktemp)"
+    CLEANUP_FILES+=("${upload_res_file}")
+
+    local upload_status
+    upload_status=$(curl -s -S -o "${upload_res_file}" -w "%{http_code}" \
+        -X POST "${API_BASE}/releases/${RELEASE_ID}/assets?name=${encoded_name}" \
        -H "Accept: application/json" \
        -H "Authorization: token ${TOKEN}" \
        -H "Content-Type: application/octet-stream" \
-        --data-binary "@${file_path}" > /dev/null
-    echo "✓ ${filename} erfolgreich hochgeladen."
+        --data-binary "@${file_path}" || echo "000")
+
+    if [ "${upload_status}" = "201" ]; then
+        echo "✓ ${filename} erfolgreich hochgeladen."
+    else
+        echo "FEHLER: Asset-Upload für '${filename}' fehlgeschlagen (HTTP ${upload_status})."
+        cat "${upload_res_file}"
+        exit 1
+    fi
 }

 upload_asset "${DEB_FILE}"
@@ -165,13 +165,18 @@ impl AutosaveController {
                }
                AutosaveResponse::ManifestSaved { result } => {
                    if let Err(e) = result {
-                        eprintln!("[Autosave-Fehler] Manifest konnte nicht gespeichert werden: {e}");
+                        eprintln!(
+                            "[Autosave-Fehler] Manifest konnte nicht gespeichert werden: {e}"
+                        );
                        self.status = AutosaveStatus::Error;
                    }
                }
            }

-            if self.in_flight_count == 0 && self.pending_pages.is_empty() && self.status != AutosaveStatus::Error {
+            if self.in_flight_count == 0
+                && self.pending_pages.is_empty()
+                && self.status != AutosaveStatus::Error
+            {
                self.status = AutosaveStatus::Saved;
            }
        }
@@ -39,13 +39,7 @@ pub fn generate_paper_quad() -> Vec<InkVertex> {

 /// Fügt ein Quad (2 Dreiecke) zur Vertexliste hinzu.
 #[inline]
-fn push_quad(
-    vertices: &mut Vec<InkVertex>,
-    x_min: f32,
-    y_min: f32,
-    x_max: f32,
-    y_max: f32,
-) {
+fn push_quad(vertices: &mut Vec<InkVertex>, x_min: f32, y_min: f32, x_max: f32, y_max: f32) {
    vertices.push(InkVertex::new(x_min, y_min, BACKGROUND_PATTERN_COLOR));
    vertices.push(InkVertex::new(x_max, y_min, BACKGROUND_PATTERN_COLOR));
    vertices.push(InkVertex::new(x_min, y_max, BACKGROUND_PATTERN_COLOR));
@@ -102,7 +96,13 @@ pub fn generate_background_mesh(background: PageBackground) -> Vec<InkVertex> {
            while y < PAGE_HEIGHT {
                let mut x = GRID_5MM_SPACING;
                while x < PAGE_WIDTH {
-                    push_quad(&mut vertices, x - half_d, y - half_d, x + half_d, y + half_d);
+                    push_quad(
+                        &mut vertices,
+                        x - half_d,
+                        y - half_d,
+                        x + half_d,
+                        y + half_d,
+                    );
                    x += GRID_5MM_SPACING;
                }
                y += GRID_5MM_SPACING;
@@ -132,7 +132,11 @@ mod tests {

        let grid = generate_background_mesh(PageBackground::Grid5mm);
        assert!(!grid.is_empty());
-        assert_eq!(grid.len() % 6, 0, "Muss ein Vielfaches von 6 Vertizes sein (Dreiecke)");
+        assert_eq!(
+            grid.len() % 6,
+            0,
+            "Muss ein Vielfaches von 6 Vertizes sein (Dreiecke)"
+        );

        let lined = generate_background_mesh(PageBackground::Lined);
        assert!(!lined.is_empty());
@@ -11,9 +11,7 @@ use std::sync::Arc;
 use winit::dpi::PhysicalSize;
 use winit::window::Window;

-use crate::background::{
-    generate_background_mesh, generate_paper_quad, DESK_COLOR,
-};
+use crate::background::{generate_background_mesh, generate_paper_quad, DESK_COLOR};
 use crate::document::{Page, PageBackground, PageViewport, Stroke, StylusSample};
 use crate::filter::OneEuroFilter;
 use crate::spline::{self, ControlPoint, SplineConfig};
@@ -143,7 +141,8 @@ impl CanvasState {
    /// Initialisiert den CanvasState für das übergebene Winit-Fenster.
    pub async fn new(window: Arc<Window>) -> Result<Self, Box<dyn std::error::Error>> {
        let size = window.inner_size();
-        let viewport = PageViewport::calculate(size.width as f32, size.height as f32, Self::VIEWPORT_MARGIN);
+        let viewport =
+            PageViewport::calculate(size.width as f32, size.height as f32, Self::VIEWPORT_MARGIN);

        // 1. WGPU Instance & Surface
        let instance = wgpu::Instance::new(wgpu::InstanceDescriptor {
@@ -187,7 +186,10 @@ impl CanvasState {
        let present_mode = if std::env::var("INK_FORCE_FIFO").is_ok() {
            eprintln!("Erzwinge PresentMode::Fifo (via INK_FORCE_FIFO)");
            wgpu::PresentMode::Fifo
-        } else if surface_caps.present_modes.contains(&wgpu::PresentMode::Mailbox) {
+        } else if surface_caps
+            .present_modes
+            .contains(&wgpu::PresentMode::Mailbox)
+        {
            eprintln!("Verwende Zero-Latency PresentMode::Mailbox");
            wgpu::PresentMode::Mailbox
        } else {
@@ -358,12 +360,7 @@ impl CanvasState {
        });

        // 8. egui Renderer für das schwebende UI initialisieren
-        let egui_renderer = egui_wgpu::Renderer::new(
-            &device,
-            config.format,
-            None,
-            1,
-        );
+        let egui_renderer = egui_wgpu::Renderer::new(&device, config.format, None, 1);

        Ok(Self {
            surface,
@@ -410,7 +407,11 @@ impl CanvasState {
            transform_scale: scale,
            transform_offset: offset,
        };
-        self.queue.write_buffer(&self.camera_buffer, 0, bytemuck::cast_slice(&[camera_uniforms]));
+        self.queue.write_buffer(
+            &self.camera_buffer,
+            0,
+            bytemuck::cast_slice(&[camera_uniforms]),
+        );
    }

    /// Passt die Surface und Projektionsmatrizen an eine neue Fenstergröße an.
@@ -433,13 +434,15 @@ impl CanvasState {

    /// Verschiebt den Bildausschnitt um Bildschirm-Pixel delta.
    pub fn pan(&mut self, delta_x: f32, delta_y: f32) {
-        self.camera.pan_by_screen_delta(delta_x, delta_y, &self.viewport);
+        self.camera
+            .pan_by_screen_delta(delta_x, delta_y, &self.viewport);
        self.update_uniforms();
    }

    /// Zoomt zentriert auf eine Cursor-Bildschirmposition.
    pub fn zoom_at(&mut self, cursor_x: f32, cursor_y: f32, factor: f32) {
-        self.camera.zoom_at_cursor([cursor_x, cursor_y], factor, &self.viewport);
+        self.camera
+            .zoom_at_cursor([cursor_x, cursor_y], factor, &self.viewport);
        self.update_uniforms();
    }

@@ -451,12 +454,14 @@ impl CanvasState {

    /// Transformiert Fenster-Pixel in Seitenkoordinaten.
    pub fn screen_to_page(&self, screen_x: f32, screen_y: f32) -> Option<glam::Vec2> {
-        self.camera.screen_to_page(screen_x, screen_y, &self.viewport)
+        self.camera
+            .screen_to_page(screen_x, screen_y, &self.viewport)
    }

    /// Transformiert Fenster-Pixel in Seitenkoordinaten und klemmt auf die Seite.
    pub fn screen_to_page_clamped(&self, screen_x: f32, screen_y: f32) -> glam::Vec2 {
-        self.camera.screen_to_page_clamped(screen_x, screen_y, &self.viewport)
+        self.camera
+            .screen_to_page_clamped(screen_x, screen_y, &self.viewport)
    }

    /// Transformiert einen Punkt aus DIN-A4-Seitenkoordinaten in Fenster-Bildschirmkoordinaten.
@@ -471,7 +476,8 @@ impl CanvasState {
        self.live_vertex_count = self.live_vertices.len() as u32;

        if self.live_vertices.len() > self.live_vertex_capacity {
-            self.live_vertex_capacity = (self.live_vertices.len() * 2).max(Self::INITIAL_LIVE_CAPACITY);
+            self.live_vertex_capacity =
+                (self.live_vertices.len() * 2).max(Self::INITIAL_LIVE_CAPACITY);
            self.live_vertex_buffer = self.device.create_buffer(&wgpu::BufferDescriptor {
                label: Some("Live Stroke Vertex Buffer (Reallocated)"),
                size: (self.live_vertex_capacity * std::mem::size_of::<InkVertex>()) as u64,
@@ -522,7 +528,8 @@ impl CanvasState {
        }

        if !mesh.is_empty() {
-            self.queue.write_buffer(&self.background_buffer, 0, bytemuck::cast_slice(&mesh));
+            self.queue
+                .write_buffer(&self.background_buffer, 0, bytemuck::cast_slice(&mesh));
        }
    }

@@ -539,7 +546,8 @@ impl CanvasState {
        }

        if page.vertex_cache.len() > self.committed_vertex_capacity {
-            self.committed_vertex_capacity = (page.vertex_cache.len() * 2).max(Self::INITIAL_COMMITTED_CAPACITY);
+            self.committed_vertex_capacity =
+                (page.vertex_cache.len() * 2).max(Self::INITIAL_COMMITTED_CAPACITY);
            self.committed_vertex_buffer = self.device.create_buffer(&wgpu::BufferDescriptor {
                label: Some("Committed Strokes Vertex Buffer (Reallocated)"),
                size: (self.committed_vertex_capacity * std::mem::size_of::<InkVertex>()) as u64,
@@ -655,7 +663,8 @@ impl CanvasState {
        }

        let color = self.current_ink_color;
-        let raw_strip = spline::generate_triangle_strip(&self.live_control_points, &self.spline_config);
+        let raw_strip =
+            spline::generate_triangle_strip(&self.live_control_points, &self.spline_config);
        self.live_vertices = raw_strip
            .into_iter()
            .map(|v| InkVertex::new(v.position[0], v.position[1], color))
@@ -667,7 +676,8 @@ impl CanvasState {
        }

        if self.live_vertices.len() > self.live_vertex_capacity {
-            self.live_vertex_capacity = (self.live_vertices.len() * 2).max(Self::INITIAL_LIVE_CAPACITY);
+            self.live_vertex_capacity =
+                (self.live_vertices.len() * 2).max(Self::INITIAL_LIVE_CAPACITY);
            self.live_vertex_buffer = self.device.create_buffer(&wgpu::BufferDescriptor {
                label: Some("Live Stroke Vertex Buffer (Reallocated)"),
                size: (self.live_vertex_capacity * std::mem::size_of::<InkVertex>()) as u64,
@@ -694,7 +704,8 @@ impl CanvasState {
    ) -> Result<(), wgpu::SurfaceError> {
        // Vor dem Renderpass: egui-Texturen aktualisieren
        for (id, image_delta) in &textures_delta.set {
-            self.egui_renderer.update_texture(&self.device, &self.queue, *id, image_delta);
+            self.egui_renderer
+                .update_texture(&self.device, &self.queue, *id, image_delta);
        }

        let output = self.surface.get_current_texture()?;
@@ -784,7 +795,8 @@ impl CanvasState {
                occlusion_query_set: None,
            });

-            self.egui_renderer.render(&mut egui_pass, clipped_primitives, screen_descriptor);
+            self.egui_renderer
+                .render(&mut egui_pass, clipped_primitives, screen_descriptor);
        }

        self.queue.submit(std::iter::once(encoder.finish()));
@@ -115,12 +115,20 @@ pub struct Stroke {
 }

 impl Stroke {
-    pub fn new(id: u64, points: Vec<StylusSample>, vertices: Vec<InkVertex>, color: [f32; 4]) -> Self {
+    pub fn new(
+        id: u64,
+        points: Vec<StylusSample>,
+        vertices: Vec<InkVertex>,
+        color: [f32; 4],
+    ) -> Self {
        let aabb = if !points.is_empty() {
            let pts: Vec<glam::Vec2> = points.iter().map(|s| s.position).collect();
            Aabb::from_points(&pts)
        } else if !vertices.is_empty() {
-            let pts: Vec<glam::Vec2> = vertices.iter().map(|v| glam::Vec2::new(v.position[0], v.position[1])).collect();
+            let pts: Vec<glam::Vec2> = vertices
+                .iter()
+                .map(|v| glam::Vec2::new(v.position[0], v.position[1]))
+                .collect();
            Aabb::from_points(&pts)
        } else {
            Aabb::new(glam::Vec2::ZERO, glam::Vec2::ZERO)
@@ -171,7 +179,12 @@ impl Stroke {
    }

    /// Prüft, ob dieser Strich von einem Radierer an Position `eraser_pos` mit Radius `eraser_radius` getroffen wird.
-    pub fn intersects_eraser(&self, eraser_pos: glam::Vec2, eraser_radius: f32, max_stroke_radius: f32) -> bool {
+    pub fn intersects_eraser(
+        &self,
+        eraser_pos: glam::Vec2,
+        eraser_radius: f32,
+        max_stroke_radius: f32,
+    ) -> bool {
        // 1. Vorabtest: Schneidet der Radierer die vergrößerte AABB?
        let total_margin = eraser_radius + max_stroke_radius;
        if !self.aabb.expanded(total_margin).contains_point(eraser_pos) {
@@ -254,9 +267,7 @@ impl Stroke {

    /// Skaliert den Strich bezüglich `origin` um die Faktoren `factors`.
    pub fn scale(&mut self, origin: glam::Vec2, factors: glam::Vec2) {
-        let sc = |pos: glam::Vec2| -> glam::Vec2 {
-            origin + (pos - origin) * factors
-        };
+        let sc = |pos: glam::Vec2| -> glam::Vec2 { origin + (pos - origin) * factors };

        for pt in &mut self.points {
            pt.position = sc(pt.position);
@@ -402,7 +413,12 @@ impl Page {
    /// Radiert alle Striche an der Position `eraser_pos` mit Radius `eraser_radius`.
    ///
    /// Gibt die gelöschten Striche zurück (falls welche getroffen wurden).
-    pub fn erase_at(&mut self, eraser_pos: glam::Vec2, eraser_radius: f32, max_stroke_radius: f32) -> Vec<Stroke> {
+    pub fn erase_at(
+        &mut self,
+        eraser_pos: glam::Vec2,
+        eraser_radius: f32,
+        max_stroke_radius: f32,
+    ) -> Vec<Stroke> {
        let mut hit_indices = Vec::new();

        for (i, stroke) in self.strokes.iter().enumerate() {
@@ -422,7 +438,8 @@ impl Page {
        }

        removed.reverse();
-        self.history.push(HistoryAction::RemoveStrokes(removed.clone()));
+        self.history
+            .push(HistoryAction::RemoveStrokes(removed.clone()));
        self.is_dirty = true;

        removed
@@ -473,7 +490,11 @@ impl Page {

    /// Liefert Klone der Striche mit den angegebenen IDs.
    pub fn get_strokes(&self, ids: &[u64]) -> Vec<Stroke> {
-        self.strokes.iter().filter(|s| ids.contains(&s.id)).cloned().collect()
+        self.strokes
+            .iter()
+            .filter(|s| ids.contains(&s.id))
+            .cloned()
+            .collect()
    }

    /// Aktualisiert eine Menge geänderter Striche transaktional im History-Stack.
@@ -482,7 +503,12 @@ impl Page {
            return;
        }
        let ids: Vec<u64> = modified.iter().map(|s| s.id).collect();
-        let before: Vec<Stroke> = self.strokes.iter().filter(|s| ids.contains(&s.id)).cloned().collect();
+        let before: Vec<Stroke> = self
+            .strokes
+            .iter()
+            .filter(|s| ids.contains(&s.id))
+            .cloned()
+            .collect();

        for m in modified.iter() {
            if let Some(pos) = self.strokes.iter().position(|s| s.id == m.id) {
@@ -517,7 +543,8 @@ impl Page {
                self.strokes[pos] = m.clone();
            }
        }
-        self.history.push(HistoryAction::ModifyStrokes { before, after });
+        self.history
+            .push(HistoryAction::ModifyStrokes { before, after });
        self.is_dirty = true;
    }

@@ -534,7 +561,8 @@ impl Page {
        });

        if !removed.is_empty() {
-            self.history.push(HistoryAction::RemoveStrokes(removed.clone()));
+            self.history
+                .push(HistoryAction::RemoveStrokes(removed.clone()));
            self.is_dirty = true;
        }
        removed
@@ -545,7 +573,8 @@ impl Page {
        if new_strokes.is_empty() {
            return;
        }
-        self.history.push(HistoryAction::AddStrokes(new_strokes.clone()));
+        self.history
+            .push(HistoryAction::AddStrokes(new_strokes.clone()));
        self.strokes.extend(new_strokes);
        self.is_dirty = true;
    }
@@ -653,7 +682,11 @@ impl Notebook {

    /// Text für das On-Screen-Display (OSD), z. B. "Seite 3 / 12".
    pub fn osd_text(&self) -> String {
-        format!("Seite {} / {}", self.current_page_index + 1, self.pages.len())
+        format!(
+            "Seite {} / {}",
+            self.current_page_index + 1,
+            self.pages.len()
+        )
    }
 }

@@ -787,13 +820,25 @@ mod tests {
        let stroke_radius = 2.0;

        // Treffer: Radierer bei (150, 105) (Abstand 5 <= 12)
-        assert!(stroke.intersects_eraser(glam::Vec2::new(150.0, 105.0), eraser_radius, stroke_radius));
+        assert!(stroke.intersects_eraser(
+            glam::Vec2::new(150.0, 105.0),
+            eraser_radius,
+            stroke_radius
+        ));

        // Kein Treffer: Radierer bei (150, 150) (Abstand 50 > 12)
-        assert!(!stroke.intersects_eraser(glam::Vec2::new(150.0, 150.0), eraser_radius, stroke_radius));
+        assert!(!stroke.intersects_eraser(
+            glam::Vec2::new(150.0, 150.0),
+            eraser_radius,
+            stroke_radius
+        ));

        // Kein Treffer: Weit außerhalb der AABB
-        assert!(!stroke.intersects_eraser(glam::Vec2::new(500.0, 500.0), eraser_radius, stroke_radius));
+        assert!(!stroke.intersects_eraser(
+            glam::Vec2::new(500.0, 500.0),
+            eraser_radius,
+            stroke_radius
+        ));
    }

    #[test]
@@ -966,9 +1011,12 @@ mod tests {
        let mut moved = s.clone();
        moved.translate(glam::Vec2::new(20.0, 30.0));
        page.update_strokes_ephemeral(&[moved.clone()]);
-        assert_eq!(page.strokes[0].points[0].position, glam::Vec2::new(30.0, 40.0));
+        assert_eq!(
+            page.strokes[0].points[0].position,
+            glam::Vec2::new(30.0, 40.0)
+        );
        // History should not have been updated yet
-        assert_eq!(page.history.can_redo(), false);
+        assert!(!page.history.can_redo());

        // Transactional commit (mouse release)
        let before = vec![s.clone()];
@@ -977,10 +1025,16 @@ mod tests {

        // Verify Undo restores original position
        assert!(page.undo());
-        assert_eq!(page.strokes[0].points[0].position, glam::Vec2::new(10.0, 10.0));
+        assert_eq!(
+            page.strokes[0].points[0].position,
+            glam::Vec2::new(10.0, 10.0)
+        );

        // Verify Redo applies modified position
        assert!(page.redo());
-        assert_eq!(page.strokes[0].points[0].position, glam::Vec2::new(30.0, 40.0));
+        assert_eq!(
+            page.strokes[0].points[0].position,
+            glam::Vec2::new(30.0, 40.0)
+        );
    }
 }
@@ -12,7 +12,7 @@
 use std::error::Error;
 use std::fs::File;
 use std::io::BufWriter;
-use std::path::Path;
+use std::path::{Path, PathBuf};

 use printpdf::path::{PaintMode, WindingOrder};
 use printpdf::{Color, Line, Mm, PdfDocument, PdfDocumentReference, Point, Polygon, Rgb};
@@ -22,6 +22,70 @@ use crate::document::{
    Notebook, Page, PageBackground, Stroke, A4_HEIGHT_MM, A4_WIDTH_MM, PAGE_HEIGHT, PAGE_WIDTH,
 };

+/// Bereinigt einen Titel für die Verwendung in Dateinamen (entfernt illegale Zeichen).
+pub fn sanitize_filename_component(title: &str) -> String {
+    let sanitized: String = title
+        .chars()
+        .map(|c| match c {
+            '/' | '\\' | '\0' | ':' | '*' | '?' | '"' | '<' | '>' | '|' => '_',
+            c => c,
+        })
+        .collect();
+    let trimmed = sanitized.trim();
+    if trimmed.is_empty() {
+        "Notizbuch".to_string()
+    } else {
+        trimmed.to_string()
+    }
+}
+
+/// Ermittelt das Standard-Dokumentenverzeichnis ($XDG_DOCUMENTS_DIR mit Fallback ~/Documents).
+pub fn default_documents_dir() -> PathBuf {
+    if let Ok(dir) = std::env::var("XDG_DOCUMENTS_DIR") {
+        if !dir.trim().is_empty() {
+            return PathBuf::from(dir);
+        }
+    }
+
+    if let Ok(home) = std::env::var("HOME") {
+        if !home.trim().is_empty() {
+            return PathBuf::from(home).join("Documents");
+        }
+    }
+
+    PathBuf::from(".")
+}
+
+/// Ermittelt den kollisionsfreien Export-Pfad für ein Notizbuch im übergebenen Verzeichnis.
+/// Existiert die Datei bereits, wird ein Zähler angehängt (`_1`, `_2`, etc.).
+pub fn resolve_pdf_export_path_in_dir(dir: &Path, title: &str) -> PathBuf {
+    let sanitized_title = sanitize_filename_component(title);
+    let base_name = format!("{}.pdf", sanitized_title);
+    let primary_path = dir.join(&base_name);
+
+    if !primary_path.exists() {
+        return primary_path;
+    }
+
+    let mut counter = 1;
+    loop {
+        let candidate_name = format!("{}_{}.pdf", sanitized_title, counter);
+        let candidate_path = dir.join(candidate_name);
+        if !candidate_path.exists() {
+            return candidate_path;
+        }
+        counter += 1;
+    }
+}
+
+/// Ermittelt das Ziel für den PDF-Export unter Berücksichtigung von XDG_DOCUMENTS_DIR
+/// und automatischer Namenskollisionsvermeidung. Erstellt das Verzeichnis, falls nötig.
+pub fn resolve_pdf_export_path(title: &str) -> PathBuf {
+    let docs_dir = default_documents_dir();
+    let _ = std::fs::create_dir_all(&docs_dir);
+    resolve_pdf_export_path_in_dir(&docs_dir, title)
+}
+
 /// Wählbare Exportstrategie für Vektorstriche.
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
 pub enum ExportStrategy {
@@ -78,12 +142,8 @@ pub fn generate_pdf_document(

    // 1. Erstes Dokument mit Seite 1 erstellen
    let title = "ink-notes Notebook";
-    let (doc, page1_idx, layer1_bg) = PdfDocument::new(
-        title,
-        Mm(A4_WIDTH_MM),
-        Mm(A4_HEIGHT_MM),
-        "Background",
-    );
+    let (doc, page1_idx, layer1_bg) =
+        PdfDocument::new(title, Mm(A4_WIDTH_MM), Mm(A4_HEIGHT_MM), "Background");

    // Seite 1 befüllen
    let page1_ref = doc.get_page(page1_idx);
@@ -95,11 +155,7 @@ pub fn generate_pdf_document(

    // 2. Alle nachfolgenden Seiten hinzufügen
    for page in &notebook.pages[1..] {
-        let (page_idx, layer_bg) = doc.add_page(
-            Mm(A4_WIDTH_MM),
-            Mm(A4_HEIGHT_MM),
-            "Background",
-        );
+        let (page_idx, layer_bg) = doc.add_page(Mm(A4_WIDTH_MM), Mm(A4_HEIGHT_MM), "Background");
        let page_ref = doc.get_page(page_idx);
        let layer_bg_ref = page_ref.get_layer(layer_bg);
        render_background_layer(&layer_bg_ref, page.background);
@@ -112,10 +168,7 @@ pub fn generate_pdf_document(
 }

 /// Rendert das Vektorraster auf Layer 1 ("Background").
-fn render_background_layer(
-    layer: &printpdf::PdfLayerReference,
-    background: PageBackground,
-) {
+fn render_background_layer(layer: &printpdf::PdfLayerReference, background: PageBackground) {
    let grid_color = Color::Rgb(Rgb::new(0.88, 0.88, 0.88, None));
    layer.set_outline_color(grid_color.clone());
    layer.set_outline_thickness(0.4); // Feine 0.15 mm Haarlinie (ca. 0.4 pt)
@@ -203,11 +256,7 @@ fn render_background_layer(
 }

 /// Rendert alle Striche einer Seite auf Layer 2 ("Ink").
-fn render_ink_layer(
-    layer: &printpdf::PdfLayerReference,
-    page: &Page,
-    strategy: ExportStrategy,
-) {
+fn render_ink_layer(layer: &printpdf::PdfLayerReference, page: &Page, strategy: ExportStrategy) {
    for stroke in &page.strokes {
        if let Some(ref shape) = stroke.shape {
            render_recognized_shape(layer, shape, stroke.color);
@@ -326,7 +375,12 @@ fn render_recognized_shape(
            layer.add_polygon(poly);
        }

-        RecognizedShape::Octahedron { center, radius_x, radius_y, depth } => {
+        RecognizedShape::Octahedron {
+            center,
+            radius_x,
+            radius_y,
+            depth,
+        } => {
            let edges = crate::geometry::octahedron_edges(*center, *radius_x, *radius_y, *depth);
            for (p1, p2) in edges {
                let (x1, y1) = page_to_pdf_mm(p1.x, p1.y);
@@ -514,7 +568,8 @@ fn render_stroke_bezier(layer: &printpdf::PdfLayerReference, stroke: &Stroke) {
    layer.set_line_join_style(printpdf::LineJoinStyle::Round);

    // Durchschnittliche Linienstärke aus dem Druck berechnen
-    let avg_pressure = stroke.points.iter().map(|p| p.pressure).sum::<f32>() / stroke.points.len() as f32;
+    let avg_pressure =
+        stroke.points.iter().map(|p| p.pressure).sum::<f32>() / stroke.points.len() as f32;
    let radius_mm = (avg_pressure * 0.75 + 0.25).max(0.25);
    let thickness_pt = radius_mm * 2.0 * (72.0 / 25.4); // mm in DTP-Punkte
    layer.set_outline_thickness(thickness_pt);
@@ -693,11 +748,18 @@ mod tests {
        let temp_dir = std::env::temp_dir();
        let pdf_path = temp_dir.join("ink_notes_test_export.pdf");

-        let export_res = export_notebook_to_pdf(&notebook, &pdf_path, ExportStrategy::FilledPolygon);
-        assert!(export_res.is_ok(), "PDF-Export zu Datei muss erfolgreich sein");
+        let export_res =
+            export_notebook_to_pdf(&notebook, &pdf_path, ExportStrategy::FilledPolygon);
+        assert!(
+            export_res.is_ok(),
+            "PDF-Export zu Datei muss erfolgreich sein"
+        );

        // Datei-Existenz und Größe prüfen
-        assert!(pdf_path.exists(), "Die generierte PDF-Datei muss existieren");
+        assert!(
+            pdf_path.exists(),
+            "Die generierte PDF-Datei muss existieren"
+        );
        let metadata = std::fs::metadata(&pdf_path).unwrap();
        assert!(
            metadata.len() > 1024,
@@ -821,4 +883,43 @@ mod tests {
        assert!(bytes.len() > 1024);
        assert!(bytes.starts_with(b"%PDF-1."));
    }
+
+    #[test]
+    fn test_sanitize_filename_component() {
+        assert_eq!(sanitize_filename_component("Notizbuch 1"), "Notizbuch 1");
+        assert_eq!(
+            sanitize_filename_component("Projekt/2026: Entwurf"),
+            "Projekt_2026_ Entwurf"
+        );
+        assert_eq!(sanitize_filename_component("   "), "Notizbuch");
+        assert_eq!(sanitize_filename_component(""), "Notizbuch");
+        assert_eq!(
+            sanitize_filename_component("Mathe * Vorlesung?"),
+            "Mathe _ Vorlesung_"
+        );
+    }
+
+    #[test]
+    fn test_resolve_pdf_export_path_collision_avoidance() {
+        let temp_dir = tempfile::tempdir().expect("Konnte tempdir nicht erstellen");
+        let dir = temp_dir.path();
+
+        // 1. Erstmaliger Export: keine Kollision
+        let path1 = resolve_pdf_export_path_in_dir(dir, "Mathe Vorlesung");
+        assert_eq!(path1, dir.join("Mathe Vorlesung.pdf"));
+
+        // Datei anlegen
+        std::fs::write(&path1, b"dummy pdf 1").expect("Konnte Datei nicht schreiben");
+
+        // 2. Zweiter Export: Kollision -> _1
+        let path2 = resolve_pdf_export_path_in_dir(dir, "Mathe Vorlesung");
+        assert_eq!(path2, dir.join("Mathe Vorlesung_1.pdf"));
+
+        // Zweite Datei anlegen
+        std::fs::write(&path2, b"dummy pdf 2").expect("Konnte Datei nicht schreiben");
+
+        // 3. Dritter Export: Kollision -> _2
+        let path3 = resolve_pdf_export_path_in_dir(dir, "Mathe Vorlesung");
+        assert_eq!(path3, dir.join("Mathe Vorlesung_2.pdf"));
+    }
 }
@@ -265,9 +265,18 @@ mod tests {
        // 4. dt > 1.0 s (großer Zeitsprung z.B. auf t = 5.0 s): Muss reset() auslösen
        let (x4, y4, p4) = filter.filter(50.0, 100.0, 0.9, 5.0);
        // Nach dem Reset muss der Filter sofort exakt den neuen Punkt als Startpunkt annehmen
-        assert_eq!(x4, 50.0, "Nach Reset muss der neue X-Wert übernommen werden");
-        assert_eq!(y4, 100.0, "Nach Reset muss der neue Y-Wert übernommen werden");
-        assert_eq!(p4, 0.9, "Nach Reset muss der neue Druckwert übernommen werden");
+        assert_eq!(
+            x4, 50.0,
+            "Nach Reset muss der neue X-Wert übernommen werden"
+        );
+        assert_eq!(
+            y4, 100.0,
+            "Nach Reset muss der neue Y-Wert übernommen werden"
+        );
+        assert_eq!(
+            p4, 0.9,
+            "Nach Reset muss der neue Druckwert übernommen werden"
+        );
    }

    #[test]
@@ -344,9 +353,18 @@ mod tests {

        // 2. Vergiftungsversuch mit NaN und Infinity
        let (x_nan, y_nan, p_nan) = filter.filter(f32::NAN, f32::INFINITY, f32::NEG_INFINITY, 0.02);
-        assert!(x_nan.is_finite(), "Filter darf kein NaN bei Vergiftung ausgeben");
-        assert!(y_nan.is_finite(), "Filter darf kein Inf bei Vergiftung ausgeben");
-        assert!(p_nan.is_finite(), "Filter darf kein -Inf bei Vergiftung ausgeben");
+        assert!(
+            x_nan.is_finite(),
+            "Filter darf kein NaN bei Vergiftung ausgeben"
+        );
+        assert!(
+            y_nan.is_finite(),
+            "Filter darf kein Inf bei Vergiftung ausgeben"
+        );
+        assert!(
+            p_nan.is_finite(),
+            "Filter darf kein -Inf bei Vergiftung ausgeben"
+        );

        let (x_nan2, y_nan2, p_nan2) = filter.filter(12.0, 22.0, 0.6, f64::NAN);
        assert!(x_nan2.is_finite());
@@ -364,6 +382,9 @@ mod tests {
        assert!(x3.is_finite());
        assert!(y3.is_finite());
        assert!(p3.is_finite());
-        assert!(x3 > x2, "Filter muss sich nach Vergiftung weiter normal anpassen");
+        assert!(
+            x3 > x2,
+            "Filter muss sich nach Vergiftung weiter normal anpassen"
+        );
    }
 }
@@ -3,9 +3,9 @@
 //! Erkennt Geraden, Rechtecke, Kreise und Koordinatensysteme (Achsen)
 //! und erzeugt saubere Vektor-Primitiven und GPU-Triangle-Meshes.

-use std::f32::consts::PI;
 use glam::Vec2;
 use serde::{Deserialize, Serialize};
+use std::f32::consts::PI;

 use crate::canvas::InkVertex;
 use crate::document::{Aabb, Stroke, StylusSample};
@@ -117,7 +117,12 @@ impl RecognizedShape {
                    *c += delta;
                }
            }
-            Self::CoordinateSystem { origin, x_axis_end, y_axis_end, .. } => {
+            Self::CoordinateSystem {
+                origin,
+                x_axis_end,
+                y_axis_end,
+                ..
+            } => {
                *origin += delta;
                *x_axis_end += delta;
                *y_axis_end += delta;
@@ -159,7 +164,12 @@ impl RecognizedShape {
                    *c = rot(*c);
                }
            }
-            Self::CoordinateSystem { origin: o, x_axis_end, y_axis_end, .. } => {
+            Self::CoordinateSystem {
+                origin: o,
+                x_axis_end,
+                y_axis_end,
+                ..
+            } => {
                *o = rot(*o);
                *x_axis_end = rot(*x_axis_end);
                *y_axis_end = rot(*y_axis_end);
@@ -177,9 +187,7 @@ impl RecognizedShape {

    /// Skaliert die geometrische Form bezüglich `origin` um den Faktor `factors`.
    pub fn scale(&mut self, origin: Vec2, factors: Vec2) {
-        let sc = |pt: Vec2| -> Vec2 {
-            origin + (pt - origin) * factors
-        };
+        let sc = |pt: Vec2| -> Vec2 { origin + (pt - origin) * factors };

        match self {
            Self::Line { start, end } => {
@@ -200,7 +208,12 @@ impl RecognizedShape {
                    *c = sc(*c);
                }
            }
-            Self::CoordinateSystem { origin: o, x_axis_end, y_axis_end, .. } => {
+            Self::CoordinateSystem {
+                origin: o,
+                x_axis_end,
+                y_axis_end,
+                ..
+            } => {
                *o = sc(*o);
                *x_axis_end = sc(*x_axis_end);
                *y_axis_end = sc(*y_axis_end);
@@ -210,7 +223,12 @@ impl RecognizedShape {
                    *v = sc(*v);
                }
            }
-            Self::Octahedron { center, radius_x, radius_y, depth } => {
+            Self::Octahedron {
+                center,
+                radius_x,
+                radius_y,
+                depth,
+            } => {
                *center = sc(*center);
                *radius_x *= factors.x.abs();
                *radius_y *= factors.y.abs();
@@ -415,18 +433,17 @@ pub fn detect_rectangle(points: &[Vec2]) -> Option<RecognizedShape> {
    let epsilon = (total_len * 0.05).clamp(8.0, 45.0);
    let simplified = ramer_douglas_peucker(points, epsilon);

-    let corners: Vec<Vec2> = if simplified.len() == 5
-        && (simplified[0] - simplified[4]).length() < epsilon * 2.5
-    {
-        simplified[0..4].to_vec()
-    } else if simplified.len() == 4 {
-        simplified
-    } else if simplified.len() > 4 {
-        // Suche die 4 markantesten Ecken (stärkste Richtungsänderung)
-        extract_k_corners(&simplified, 4)?
-    } else {
-        return None;
-    };
+    let corners: Vec<Vec2> =
+        if simplified.len() == 5 && (simplified[0] - simplified[4]).length() < epsilon * 2.5 {
+            simplified[0..4].to_vec()
+        } else if simplified.len() == 4 {
+            simplified
+        } else if simplified.len() > 4 {
+            // Suche die 4 markantesten Ecken (stärkste Richtungsänderung)
+            extract_k_corners(&simplified, 4)?
+        } else {
+            return None;
+        };

    if corners.len() != 4 {
        return None;
@@ -535,7 +552,12 @@ pub fn extract_k_corners(points: &[Vec2], k: usize) -> Option<Vec<Vec2>> {
    let mut selected_indices: Vec<usize> = scored.iter().take(k).map(|&(idx, _)| idx).collect();
    selected_indices.sort_unstable();

-    Some(selected_indices.into_iter().map(|idx| points[idx]).collect())
+    Some(
+        selected_indices
+            .into_iter()
+            .map(|idx| points[idx])
+            .collect(),
+    )
 }

 /// 4. Dreieck-Erkennung: Geschlossener Pfad mit 3 dominanten Ecken.
@@ -561,7 +583,8 @@ pub fn detect_triangle(points: &[Vec2]) -> Option<RecognizedShape> {
    let epsilon = (total_len * 0.07).clamp(8.0, 50.0);
    let simplified = ramer_douglas_peucker(points, epsilon);

-    let corners: Vec<Vec2> = if (simplified.len() == 4 && (simplified[0] - simplified[3]).length() < epsilon * 2.5)
+    let corners: Vec<Vec2> = if (simplified.len() == 4
+        && (simplified[0] - simplified[3]).length() < epsilon * 2.5)
        || simplified.len() == 3
    {
        simplified[0..3].to_vec()
@@ -617,9 +640,19 @@ pub fn detect_triangle(points: &[Vec2]) -> Option<RecognizedShape> {
        let snapped_angle = snap_angle(base_angle, 15.0);

        let c0 = center + Vec2::new(snapped_angle.cos(), snapped_angle.sin()) * r;
-        let c1 = center + Vec2::new((snapped_angle + 2.0 * PI / 3.0).cos(), (snapped_angle + 2.0 * PI / 3.0).sin()) * r;
-        let c2 = center + Vec2::new((snapped_angle + 4.0 * PI / 3.0).cos(), (snapped_angle + 4.0 * PI / 3.0).sin()) * r;
-        return Some(RecognizedShape::Triangle { corners: [c0, c1, c2] });
+        let c1 = center
+            + Vec2::new(
+                (snapped_angle + 2.0 * PI / 3.0).cos(),
+                (snapped_angle + 2.0 * PI / 3.0).sin(),
+            ) * r;
+        let c2 = center
+            + Vec2::new(
+                (snapped_angle + 4.0 * PI / 3.0).cos(),
+                (snapped_angle + 4.0 * PI / 3.0).sin(),
+            ) * r;
+        return Some(RecognizedShape::Triangle {
+            corners: [c0, c1, c2],
+        });
    }

    // 2. Rechtwinklig? (Ein Winkel nahe 90°)
@@ -639,7 +672,11 @@ pub fn detect_triangle(points: &[Vec2]) -> Option<RecognizedShape> {
        let len2 = v2.length();

        v1 = Vec2::new(a1_snapped.cos(), a1_snapped.sin()) * len1;
-        let sign = if (v1.x * v2.y - v1.y * v2.x) >= 0.0 { 1.0 } else { -1.0 };
+        let sign = if (v1.x * v2.y - v1.y * v2.x) >= 0.0 {
+            1.0
+        } else {
+            -1.0
+        };
        v2 = Vec2::new(-v1.y * sign, v1.x * sign).normalize_or_zero() * len2;

        let new_p1 = corner_v + v1;
@@ -667,7 +704,9 @@ pub fn detect_triangle(points: &[Vec2]) -> Option<RecognizedShape> {
        let half_base = ((a - mid_ac).length() + (c - mid_ac).length()) * 0.5;
        let new_a = mid_ac + perp * half_base;
        c = mid_ac - perp * half_base;
-        return Some(RecognizedShape::Triangle { corners: [new_a, b, c] });
+        return Some(RecognizedShape::Triangle {
+            corners: [new_a, b, c],
+        });
    } else if (l_bc - l_ca).abs() / l_bc.max(l_ca) < 0.12 {
        let mid_ab = (a + b) * 0.5;
        let axis = (c - mid_ab).normalize_or_zero();
@@ -675,7 +714,9 @@ pub fn detect_triangle(points: &[Vec2]) -> Option<RecognizedShape> {
        let half_base = ((a - mid_ab).length() + (b - mid_ab).length()) * 0.5;
        let new_a = mid_ab + perp * half_base;
        b = mid_ab - perp * half_base;
-        return Some(RecognizedShape::Triangle { corners: [new_a, b, c] });
+        return Some(RecognizedShape::Triangle {
+            corners: [new_a, b, c],
+        });
    }

    Some(RecognizedShape::Triangle { corners: [a, b, c] })
@@ -701,15 +742,16 @@ pub fn detect_rhombus(points: &[Vec2]) -> Option<RecognizedShape> {
    let epsilon = (total_len * 0.05).clamp(8.0, 45.0);
    let simplified = ramer_douglas_peucker(points, epsilon);

-    let corners: Vec<Vec2> = if simplified.len() == 5 && (simplified[0] - simplified[4]).length() < epsilon * 2.5 {
-        simplified[0..4].to_vec()
-    } else if simplified.len() == 4 {
-        simplified
-    } else if simplified.len() > 4 {
-        extract_k_corners(&simplified, 4)?
-    } else {
-        return None;
-    };
+    let corners: Vec<Vec2> =
+        if simplified.len() == 5 && (simplified[0] - simplified[4]).length() < epsilon * 2.5 {
+            simplified[0..4].to_vec()
+        } else if simplified.len() == 4 {
+            simplified
+        } else if simplified.len() > 4 {
+            extract_k_corners(&simplified, 4)?
+        } else {
+            return None;
+        };

    if corners.len() != 4 {
        return None;
@@ -756,7 +798,11 @@ pub fn detect_rhombus(points: &[Vec2]) -> Option<RecognizedShape> {
    let snapped_a1 = snap_angle(angle1, 15.0);
    dir1 = Vec2::new(snapped_a1.cos(), snapped_a1.sin());

-    let sign = if (dir1.x * d2.y - dir1.y * d2.x) >= 0.0 { 1.0 } else { -1.0 };
+    let sign = if (dir1.x * d2.y - dir1.y * d2.x) >= 0.0 {
+        1.0
+    } else {
+        -1.0
+    };
    let dir2 = Vec2::new(-dir1.y * sign, dir1.x * sign);

    let h1 = len1 * 0.5;
@@ -806,7 +852,10 @@ pub fn detect_polygon(points: &[Vec2]) -> Option<RecognizedShape> {
        return None;
    }

-    let max_r_diff = radii.iter().map(|r| (r - mean_r).abs()).fold(0.0f32, f32::max);
+    let max_r_diff = radii
+        .iter()
+        .map(|r| (r - mean_r).abs())
+        .fold(0.0f32, f32::max);

    let snapped_vertices = if max_r_diff / mean_r < 0.25 {
        let base_dir = (corners[0] - center).normalize_or_zero();
@@ -830,7 +879,9 @@ pub fn detect_polygon(points: &[Vec2]) -> Option<RecognizedShape> {

 fn ramer_douucker_closed(points: &[Vec2], epsilon: f32) -> Vec<Vec2> {
    let simplified = ramer_douglas_peucker(points, epsilon);
-    if simplified.len() >= 2 && (simplified[0] - *simplified.last().unwrap()).length() < epsilon * 2.0 {
+    if simplified.len() >= 2
+        && (simplified[0] - *simplified.last().unwrap()).length() < epsilon * 2.0
+    {
        simplified[0..simplified.len() - 1].to_vec()
    } else {
        simplified
@@ -1043,8 +1094,16 @@ pub fn closed_polygon_to_mesh(
        let n_next = Vec2::new(-d_next.y, d_next.x);
        let corner_norm = (n_prev + n_next).normalize_or_zero() * half_w;

-        vertices.push(InkVertex::new(curr.x + corner_norm.x, curr.y + corner_norm.y, color));
-        vertices.push(InkVertex::new(curr.x - corner_norm.x, curr.y - corner_norm.y, color));
+        vertices.push(InkVertex::new(
+            curr.x + corner_norm.x,
+            curr.y + corner_norm.y,
+            color,
+        ));
+        vertices.push(InkVertex::new(
+            curr.x - corner_norm.x,
+            curr.y - corner_norm.y,
+            color,
+        ));

        let edge_len = (next - curr).length();
        let steps = ((edge_len / 10.0).ceil() as usize).max(2);
@@ -1069,7 +1128,12 @@ pub fn closed_polygon_to_mesh(
 }

 /// Berechnet die 12 Kanten der 3D-Schrägbild-Projektion eines Oktaeders (Doppelpyramide).
-pub fn octahedron_edges(center: Vec2, radius_x: f32, radius_y: f32, depth: f32) -> Vec<(Vec2, Vec2)> {
+pub fn octahedron_edges(
+    center: Vec2,
+    radius_x: f32,
+    radius_y: f32,
+    depth: f32,
+) -> Vec<(Vec2, Vec2)> {
    let top = center + Vec2::new(0.0, -radius_y);
    let bottom = center + Vec2::new(0.0, radius_y);
    let left = center + Vec2::new(-radius_x, 0.0);
@@ -1143,8 +1207,16 @@ pub fn shape_to_mesh(
                let angle = (i as f32 / segments as f32) * 2.0 * PI;
                let (sin, cos) = angle.sin_cos();

-                vertices.push(InkVertex::new(center.x + cos * r_out, center.y + sin * r_out, color));
-                vertices.push(InkVertex::new(center.x + cos * r_in, center.y + sin * r_in, color));
+                vertices.push(InkVertex::new(
+                    center.x + cos * r_out,
+                    center.y + sin * r_out,
+                    color,
+                ));
+                vertices.push(InkVertex::new(
+                    center.x + cos * r_in,
+                    center.y + sin * r_in,
+                    color,
+                ));

                if i < segments {
                    samples.push(StylusSample {
@@ -1158,23 +1230,20 @@ pub fn shape_to_mesh(
            (samples, vertices)
        }

-        RecognizedShape::Rectangle { corners } => {
-            closed_polygon_to_mesh(corners, half_w, color)
-        }
+        RecognizedShape::Rectangle { corners } => closed_polygon_to_mesh(corners, half_w, color),

-        RecognizedShape::Triangle { corners } => {
-            closed_polygon_to_mesh(corners, half_w, color)
-        }
+        RecognizedShape::Triangle { corners } => closed_polygon_to_mesh(corners, half_w, color),

-        RecognizedShape::Rhombus { corners } => {
-            closed_polygon_to_mesh(corners, half_w, color)
-        }
+        RecognizedShape::Rhombus { corners } => closed_polygon_to_mesh(corners, half_w, color),

-        RecognizedShape::Polygon { vertices } => {
-            closed_polygon_to_mesh(vertices, half_w, color)
-        }
+        RecognizedShape::Polygon { vertices } => closed_polygon_to_mesh(vertices, half_w, color),

-        RecognizedShape::Octahedron { center, radius_x, radius_y, depth } => {
+        RecognizedShape::Octahedron {
+            center,
+            radius_x,
+            radius_y,
+            depth,
+        } => {
            let edges = octahedron_edges(*center, *radius_x, *radius_y, *depth);
            let mut vertices = Vec::new();
            let mut samples = Vec::new();
@@ -1228,10 +1297,26 @@ pub fn shape_to_mesh(
            let y_norm = Vec2::new(-y_dir.y, y_dir.x) * half_w;

            // Y-Linienband
-            vertices.push(InkVertex::new(origin.x + y_norm.x, origin.y + y_norm.y, color));
-            vertices.push(InkVertex::new(origin.x - y_norm.x, origin.y - y_norm.y, color));
-            vertices.push(InkVertex::new(y_axis_end.x + y_norm.x, y_axis_end.y + y_norm.y, color));
-            vertices.push(InkVertex::new(y_axis_end.x - y_norm.x, y_axis_end.y - y_norm.y, color));
+            vertices.push(InkVertex::new(
+                origin.x + y_norm.x,
+                origin.y + y_norm.y,
+                color,
+            ));
+            vertices.push(InkVertex::new(
+                origin.x - y_norm.x,
+                origin.y - y_norm.y,
+                color,
+            ));
+            vertices.push(InkVertex::new(
+                y_axis_end.x + y_norm.x,
+                y_axis_end.y + y_norm.y,
+                color,
+            ));
+            vertices.push(InkVertex::new(
+                y_axis_end.x - y_norm.x,
+                y_axis_end.y - y_norm.y,
+                color,
+            ));

            // Degenerate Dreiecke für Übergang zur X-Achse
            let x_dir = (*x_axis_end - *origin).normalize_or_zero();
@@ -1244,9 +1329,21 @@ pub fn shape_to_mesh(

            // 2. X-Linienband
            vertices.push(next_v);
-            vertices.push(InkVertex::new(origin.x - x_norm.x, origin.y - x_norm.y, color));
-            vertices.push(InkVertex::new(x_axis_end.x + x_norm.x, x_axis_end.y + x_norm.y, color));
-            vertices.push(InkVertex::new(x_axis_end.x - x_norm.x, x_axis_end.y - x_norm.y, color));
+            vertices.push(InkVertex::new(
+                origin.x - x_norm.x,
+                origin.y - x_norm.y,
+                color,
+            ));
+            vertices.push(InkVertex::new(
+                x_axis_end.x + x_norm.x,
+                x_axis_end.y + x_norm.y,
+                color,
+            ));
+            vertices.push(InkVertex::new(
+                x_axis_end.x - x_norm.x,
+                x_axis_end.y - x_norm.y,
+                color,
+            ));

            // 3. Optionale Pfeilspitzen
            if *with_arrows {
@@ -1328,7 +1425,10 @@ mod tests {
        for i in 0..=50 {
            let t = i as f32 / 50.0;
            let jitter = (i as f32 * 0.7).sin() * 1.5;
-            points.push(Vec2::new(100.0 + t * 400.0 + jitter, 100.0 + t * 300.0 - jitter));
+            points.push(Vec2::new(
+                100.0 + t * 400.0 + jitter,
+                100.0 + t * 300.0 - jitter,
+            ));
        }

        let detected = detect_line(&points);
@@ -1380,7 +1480,12 @@ mod tests {
                let v1 = (prev - curr).normalize();
                let v2 = (next - curr).normalize();
                let dot = v1.dot(v2).abs();
-                assert!(dot < 1e-4, "Winkel an Ecke {} ist nicht rechtwinklig: dot={}", i, dot);
+                assert!(
+                    dot < 1e-4,
+                    "Winkel an Ecke {} ist nicht rechtwinklig: dot={}",
+                    i,
+                    dot
+                );
            }
        } else {
            panic!("Falscher Formtyp erkannt");
@@ -1402,7 +1507,11 @@ mod tests {
        let detected = detect_circle(&points);
        assert!(detected.is_some(), "Kreis sollte erkannt werden");

-        if let Some(RecognizedShape::Circle { center: c, radius: r }) = detected {
+        if let Some(RecognizedShape::Circle {
+            center: c,
+            radius: r,
+        }) = detected
+        {
            assert!((c - center).length() < 5.0, "Zentrum weicht ab: {:?}", c);
            assert!((r - 54.0).abs() < 5.0, "Radius weicht ab: {}", r);
        } else {
@@ -1431,14 +1540,27 @@ mod tests {
        }

        let detected = detect_coordinate_system(&points);
-        assert!(detected.is_some(), "Koordinatensystem sollte erkannt werden");
+        assert!(
+            detected.is_some(),
+            "Koordinatensystem sollte erkannt werden"
+        );

-        if let Some(RecognizedShape::CoordinateSystem { origin: o, x_axis_end, y_axis_end, .. }) = detected {
+        if let Some(RecognizedShape::CoordinateSystem {
+            origin: o,
+            x_axis_end,
+            y_axis_end,
+            ..
+        }) = detected
+        {
            assert!((o - origin).length() < 2.0, "Ursprung weicht ab");
            let v_x = (x_axis_end - o).normalize();
            let v_y = (y_axis_end - o).normalize();
            let dot = v_x.dot(v_y).abs();
-            assert!(dot < 1e-4, "Achsen sind nach Orthogonalitäts-Snap nicht exakt 90°: dot={}", dot);
+            assert!(
+                dot < 1e-4,
+                "Achsen sind nach Orthogonalitäts-Snap nicht exakt 90°: dot={}",
+                dot
+            );
        } else {
            panic!("Falscher Formtyp erkannt");
        }
@@ -1476,7 +1598,10 @@ mod tests {
            let ab = (corners[1] - corners[0]).length();
            let bc = (corners[2] - corners[1]).length();
            let ca = (corners[0] - corners[2]).length();
-            assert!((ab - bc).abs() < 5.0, "Gleichseitiges Dreieck sollte gesnappt sein");
+            assert!(
+                (ab - bc).abs() < 5.0,
+                "Gleichseitiges Dreieck sollte gesnappt sein"
+            );
            assert!((bc - ca).abs() < 5.0);
        } else {
            panic!("Falscher Formtyp erkannt");
@@ -1490,7 +1615,7 @@ mod tests {
        let c0 = Vec2::new(200.0, 100.0); // Oben
        let c1 = Vec2::new(320.0, 250.0); // Rechts
        let c2 = Vec2::new(200.0, 400.0); // Unten
-        let c3 = Vec2::new(80.0, 250.0);  // Links
+        let c3 = Vec2::new(80.0, 250.0); // Links

        for i in 0..20 {
            let t = i as f32 / 20.0;
@@ -1520,7 +1645,10 @@ mod tests {
            let l1 = (corners[2] - corners[1]).length();
            let l2 = (corners[3] - corners[2]).length();
            let l3 = (corners[0] - corners[3]).length();
-            assert!((l0 - l1).abs() < 1e-3, "Alle 4 Seiten einer Raute müssen exakt gleich lang sein");
+            assert!(
+                (l0 - l1).abs() < 1e-3,
+                "Alle 4 Seiten einer Raute müssen exakt gleich lang sein"
+            );
            assert!((l1 - l2).abs() < 1e-3);
            assert!((l2 - l3).abs() < 1e-3);
        } else {
@@ -1549,7 +1677,10 @@ mod tests {
        points.push(points[0]);

        let detected = detect_polygon(&points);
-        assert!(detected.is_some(), "Oktagon / Achteck sollte erkannt werden");
+        assert!(
+            detected.is_some(),
+            "Oktagon / Achteck sollte erkannt werden"
+        );

        if let Some(RecognizedShape::Polygon { vertices }) = detected {
            assert_eq!(vertices.len(), 8, "Achteck muss 8 Vertizes haben");
@@ -1587,7 +1718,13 @@ mod tests {
        let detected = detect_octahedron(&points);
        assert!(detected.is_some(), "Oktaeder sollte erkannt werden");

-        if let Some(RecognizedShape::Octahedron { center, radius_x, radius_y, depth }) = detected {
+        if let Some(RecognizedShape::Octahedron {
+            center,
+            radius_x,
+            radius_y,
+            depth,
+        }) = detected
+        {
            assert!((center.x - 200.0).abs() < 5.0);
            assert!((center.y - 200.0).abs() < 5.0);
            assert!(radius_x > 100.0);
@@ -83,7 +83,8 @@ impl HistoryStack {
                if let Some(pos) = strokes.iter().position(|s| s.id == new.id) {
                    strokes[pos] = old.clone();
                }
-                self.redo_stack.push(HistoryAction::ReplaceStroke { old, new });
+                self.redo_stack
+                    .push(HistoryAction::ReplaceStroke { old, new });
            }
            HistoryAction::ModifyStrokes { before, after } => {
                for b in &before {
@@ -91,7 +92,8 @@ impl HistoryStack {
                        strokes[pos] = b.clone();
                    }
                }
-                self.redo_stack.push(HistoryAction::ModifyStrokes { before, after });
+                self.redo_stack
+                    .push(HistoryAction::ModifyStrokes { before, after });
            }
        }

@@ -126,7 +128,8 @@ impl HistoryStack {
                if let Some(pos) = strokes.iter().position(|s| s.id == old.id) {
                    strokes[pos] = new.clone();
                }
-                self.undo_stack.push(HistoryAction::ReplaceStroke { old, new });
+                self.undo_stack
+                    .push(HistoryAction::ReplaceStroke { old, new });
            }
            HistoryAction::ModifyStrokes { before, after } => {
                for a in &after {
@@ -134,7 +137,8 @@ impl HistoryStack {
                        strokes[pos] = a.clone();
                    }
                }
-                self.undo_stack.push(HistoryAction::ModifyStrokes { before, after });
+                self.undo_stack
+                    .push(HistoryAction::ModifyStrokes { before, after });
            }
        }

@@ -2,8 +2,8 @@
 //!
 //! Stellt transaktionale Manipulationen für einzelne oder mehrere Striche und geometrische Formen bereit.

-use std::f32::consts::FRAC_PI_2;
 use glam::Vec2;
+use std::f32::consts::FRAC_PI_2;

 use crate::canvas::CanvasState;
 use crate::document::{Aabb, Page, Stroke};
@@ -144,16 +144,16 @@ impl SelectionState {

        // 2. 4 Eck-Skalierungsgriffe testen
        let corners_page = [
-            aabb.min,                              // 0: oben-links
-            Vec2::new(aabb.max.x, aabb.min.y),     // 1: oben-rechts
-            aabb.max,                              // 2: unten-rechts
-            Vec2::new(aabb.min.x, aabb.max.y),     // 3: unten-links
+            aabb.min,                          // 0: oben-links
+            Vec2::new(aabb.max.x, aabb.min.y), // 1: oben-rechts
+            aabb.max,                          // 2: unten-rechts
+            Vec2::new(aabb.min.x, aabb.max.y), // 3: unten-links
        ];
        let fixed_corners_page = [
-            aabb.max,                              // gegenüber 0 -> unten-rechts
-            Vec2::new(aabb.min.x, aabb.max.y),     // gegenüber 1 -> unten-links
-            aabb.min,                              // gegenüber 2 -> oben-links
-            Vec2::new(aabb.max.x, aabb.min.y),     // gegenüber 3 -> oben-rechts
+            aabb.max,                          // gegenüber 0 -> unten-rechts
+            Vec2::new(aabb.min.x, aabb.max.y), // gegenüber 1 -> unten-links
+            aabb.min,                          // gegenüber 2 -> oben-links
+            Vec2::new(aabb.max.x, aabb.min.y), // gegenüber 3 -> oben-rechts
        ];

        let corners_screen = [
@@ -285,7 +285,11 @@ pub fn render_selection_overlay(
    ));

    // 1. Wenn aktuell ein Auswahlrahmen gezogen wird (Marquee Box)
-    if let DragMode::BoxSelect { start_page, current_page } = selection.drag_mode {
+    if let DragMode::BoxSelect {
+        start_page,
+        current_page,
+    } = selection.drag_mode
+    {
        let p1 = canvas.page_to_screen(start_page);
        let p2 = canvas.page_to_screen(current_page);
        let min_x = p1[0].min(p2[0]);
@@ -304,7 +308,10 @@ pub fn render_selection_overlay(
        painter.rect_stroke(
            rect,
            egui::Rounding::same(4.0_f32),
-            egui::Stroke::new(1.5_f32, egui::Color32::from_rgba_premultiplied(80, 160, 255, 220)),
+            egui::Stroke::new(
+                1.5_f32,
+                egui::Color32::from_rgba_premultiplied(80, 160, 255, 220),
+            ),
        );
        return;
    }
@@ -357,7 +364,11 @@ pub fn render_selection_overlay(

    for c in corners {
        let handle_rect = egui::Rect::from_center_size(c, egui::vec2(handle_size, handle_size));
-        painter.rect_filled(handle_rect, egui::Rounding::same(1.5_f32), egui::Color32::WHITE);
+        painter.rect_filled(
+            handle_rect,
+            egui::Rounding::same(1.5_f32),
+            egui::Color32::WHITE,
+        );
        painter.rect_stroke(
            handle_rect,
            egui::Rounding::same(1.5_f32),
@@ -369,7 +380,11 @@ pub fn render_selection_overlay(
    let badge_text = format!(
        "{} {} | [R] Drehen [Entf] Löschen",
        selection.count(),
-        if selection.count() == 1 { "Objekt" } else { "Objekte" }
+        if selection.count() == 1 {
+            "Objekt"
+        } else {
+            "Objekte"
+        }
    );
    let badge_pos = egui::pos2(rect.center().x, rect.max.y + 16.0);
    painter.text(
@@ -459,7 +474,9 @@ mod tests {
        let orig_pos = page.strokes[0].points[0].position;
        assert!(sel.rotate_selected_90_deg(&mut page));
        let rotated_pos = page.strokes[0].points[0].position;
-        assert!((orig_pos.x - rotated_pos.x).abs() > 0.1 || (orig_pos.y - rotated_pos.y).abs() > 0.1);
+        assert!(
+            (orig_pos.x - rotated_pos.x).abs() > 0.1 || (orig_pos.y - rotated_pos.y).abs() > 0.1
+        );

        // Undo rotate
        assert!(page.undo());
@@ -355,11 +355,11 @@ fn rdp_mark(positions: &[glam::Vec2], start: usize, end: usize, epsilon: f32, ke
    let mut max_dist = 0.0_f32;
    let mut max_idx = start;

-    for i in (start + 1)..end {
-        let dist = point_to_segment_distance(positions[i], a, b);
+    for (offset, &pos) in positions[(start + 1)..end].iter().enumerate() {
+        let dist = point_to_segment_distance(pos, a, b);
        if dist > max_dist {
            max_dist = dist;
-            max_idx = i;
+            max_idx = start + 1 + offset;
        }
    }

@@ -418,10 +418,7 @@ pub fn detect_corners(samples: &[StylusSample], threshold_deg: f32) -> Vec<usize
 }

 /// Tastet einen zusammenhängenden, glatten Teilabschnitt (Run) zwischen Ecken ab.
-fn sample_smooth_run(
-    control_points: &[ControlPoint],
-    config: &SplineConfig,
-) -> Vec<SplineSample> {
+fn sample_smooth_run(control_points: &[ControlPoint], config: &SplineConfig) -> Vec<SplineSample> {
    match control_points.len() {
        0 => Vec::new(),
        1 => {
@@ -621,7 +618,12 @@ pub fn generate_finalized_triangle_strip(
 /// 3. Ramer-Douglas-Peucker (RDP) Dezimierung (Toleranz ca. 0.05 bis 0.1 mm)
 /// 4. Generierung der finalen Triangle-Strips mit runden Kappen an Start und Ende.
 pub fn finalize_stroke(raw_samples: &[StylusSample]) -> Stroke {
-    finalize_stroke_with_config(0, raw_samples, [0.0, 0.0, 0.0, 1.0], &SplineConfig::default())
+    finalize_stroke_with_config(
+        0,
+        raw_samples,
+        [0.0, 0.0, 0.0, 1.0],
+        &SplineConfig::default(),
+    )
 }

 /// Vollständige Finalisierung mit konfigurierbarer Stroke-ID, Farbe und SplineConfig.
@@ -808,9 +810,10 @@ mod tests {
        assert!(!stroke.vertices.is_empty());

        // 2. Der Eckpunkt (100.0, 0.0) muss in den Strichpunkten erhalten bleiben
-        let corner_found = stroke.points.iter().any(|s| {
-            (s.position.x - 100.0).abs() < 1e-3 && (s.position.y - 0.0).abs() < 1e-3
-        });
+        let corner_found = stroke
+            .points
+            .iter()
+            .any(|s| (s.position.x - 100.0).abs() < 1e-3 && (s.position.y - 0.0).abs() < 1e-3);
        assert!(
            corner_found,
            "Eckpunkt (100.0, 0.0) muss in den finalen Strichpunkten erhalten bleiben!"
@@ -837,7 +840,11 @@ mod tests {

        // 4. Ecken-Erkennung prüft den 90°-Winkel (> 65 Grad)
        let corners = detect_corners(&stroke.points, CORNER_ANGLE_THRESHOLD_DEG);
-        assert_eq!(corners.len(), 1, "Exakt eine 90-Grad-Ecke muss erkannt werden");
+        assert_eq!(
+            corners.len(),
+            1,
+            "Exakt eine 90-Grad-Ecke muss erkannt werden"
+        );
        let corner_idx = corners[0];
        let corner_pt = stroke.points[corner_idx];
        assert!((corner_pt.position.x - 100.0).abs() < 1e-3);
@@ -847,9 +854,21 @@ mod tests {
    #[test]
    fn test_pressure_smoothing() {
        let samples = vec![
-            StylusSample { position: glam::Vec2::new(0.0, 0.0), pressure: 0.2, timestamp: 0.0 },
-            StylusSample { position: glam::Vec2::new(1.0, 0.0), pressure: 0.8, timestamp: 0.1 },
-            StylusSample { position: glam::Vec2::new(2.0, 0.0), pressure: 0.2, timestamp: 0.2 },
+            StylusSample {
+                position: glam::Vec2::new(0.0, 0.0),
+                pressure: 0.2,
+                timestamp: 0.0,
+            },
+            StylusSample {
+                position: glam::Vec2::new(1.0, 0.0),
+                pressure: 0.8,
+                timestamp: 0.1,
+            },
+            StylusSample {
+                position: glam::Vec2::new(2.0, 0.0),
+                pressure: 0.2,
+                timestamp: 0.2,
+            },
        ];

        let smoothed = smooth_pressure(&samples);
@@ -69,7 +69,12 @@ impl StrokeData {
    /// Wandelt die semantischen Daten deterministisch zurück in einen `Stroke` um,
    /// inklusive Wiederherstellung des Triangle-Strip-Vertexpuffers und der AABB.
    pub fn to_stroke(&self) -> Stroke {
-        let stylus_samples: Vec<StylusSample> = self.samples.iter().copied().map(StylusSample::from).collect();
+        let stylus_samples: Vec<StylusSample> = self
+            .samples
+            .iter()
+            .copied()
+            .map(StylusSample::from)
+            .collect();
        let vertices = if let Some(ref shape) = self.shape {
            let (_, shape_verts) = crate::geometry::shape_to_mesh(shape, 20.0, self.color);
            shape_verts
@@ -207,7 +212,11 @@ pub fn reconstruct_stroke_vertices(samples: &[StylusSample], color: [f32; 4]) ->
            let angle = (i as f32 / segments as f32) * std::f32::consts::TAU;
            let offset = glam::Vec2::new(angle.cos() * radius, angle.sin() * radius);
            vertices.push(InkVertex::new(pt.position.x, pt.position.y, color));
-            vertices.push(InkVertex::new(pt.position.x + offset.x, pt.position.y + offset.y, color));
+            vertices.push(InkVertex::new(
+                pt.position.x + offset.x,
+                pt.position.y + offset.y,
+                color,
+            ));
        }
        return vertices;
    }
@@ -241,7 +250,10 @@ pub fn reconstruct_stroke_vertices(samples: &[StylusSample], color: [f32; 4]) ->
 /// Schreibt Inhalt atomar auf die Festplatte (über temporäre Datei + `std::fs::rename`).
 pub fn atomic_write_file(path: &Path, content: &[u8]) -> Result<(), io::Error> {
    let dir = path.parent().ok_or_else(|| {
-        io::Error::new(io::ErrorKind::NotFound, "Übergeordnetes Verzeichnis nicht gefunden")
+        io::Error::new(
+            io::ErrorKind::NotFound,
+            "Übergeordnetes Verzeichnis nicht gefunden",
+        )
    })?;
    fs::create_dir_all(dir)?;

@@ -475,7 +487,7 @@ pub fn list_notebooks(base_dir: &Path) -> Vec<NotebookSummary> {
    }

    // Nach letztem Änderungsdatum absteigend sortieren (neueste zuerst)
-    list.sort_by(|a, b| b.modified_at.cmp(&a.modified_at));
+    list.sort_by_key(|a| std::cmp::Reverse(a.modified_at));
    list
 }

@@ -613,7 +625,11 @@ mod tests {
        assert_eq!(loaded_stroke.color, [0.1, 0.2, 0.8, 1.0]);
        assert_eq!(loaded_stroke.points.len(), 3);

-        for (orig, loaded) in page.strokes[0].points.iter().zip(loaded_stroke.points.iter()) {
+        for (orig, loaded) in page.strokes[0]
+            .points
+            .iter()
+            .zip(loaded_stroke.points.iter())
+        {
            assert!((orig.position.x - loaded.position.x).abs() < 1e-4);
            assert!((orig.position.y - loaded.position.y).abs() < 1e-4);
            assert!((orig.pressure - loaded.pressure).abs() < 1e-4);
@@ -633,12 +649,16 @@ mod tests {

        // Beschädigtes, unvollständiges JSON manuell schreiben
        let corrupted_file = path.join("page_99.json");
-        let truncated_json = br#"{"id": 99, "background": "Grid5mm", "strokes": [{"id": 1, "color": [0.1, 0.2"#;
+        let truncated_json =
+            br#"{"id": 99, "background": "Grid5mm", "strokes": [{"id": 1, "color": [0.1, 0.2"#;
        fs::write(&corrupted_file, truncated_json).expect("Konnte Datei nicht schreiben");

        // Laden muss einen abgefangenen CorruptedPage-Fehler liefern und darf nicht panicken
        let load_res = load_page(path, 99);
-        assert!(load_res.is_err(), "Laden beschädigter Daten muss fehlschlagen");
+        assert!(
+            load_res.is_err(),
+            "Laden beschädigter Daten muss fehlschlagen"
+        );

        match load_res.unwrap_err() {
            StorageError::CorruptedPage(id, msg) => {
@@ -729,16 +749,21 @@ mod tests {
        // 3. Auflisten
        let summaries = list_notebooks(base_dir);
        assert_eq!(summaries.len(), 2);
-        assert!(summaries.iter().any(|s| s.id == m1.id && s.title == "Mathe Vorlesung"));
-        assert!(summaries.iter().any(|s| s.id == m2.id && s.title == "Skizzen & Entwürfe"));
+        assert!(summaries
+            .iter()
+            .any(|s| s.id == m1.id && s.title == "Mathe Vorlesung"));
+        assert!(summaries
+            .iter()
+            .any(|s| s.id == m2.id && s.title == "Skizzen & Entwürfe"));

        // 4. Umbenennen
-        rename_notebook(&dir1, &mut m1, "Höhere Mathematik")
-            .expect("Umbenennen muss klappen");
+        rename_notebook(&dir1, &mut m1, "Höhere Mathematik").expect("Umbenennen muss klappen");
        assert_eq!(m1.title, "Höhere Mathematik");

        let updated_summaries = list_notebooks(base_dir);
-        assert!(updated_summaries.iter().any(|s| s.id == m1.id && s.title == "Höhere Mathematik"));
+        assert!(updated_summaries
+            .iter()
+            .any(|s| s.id == m1.id && s.title == "Höhere Mathematik"));

        // 5. Löschen
        delete_notebook(&dir2).expect("Löschen muss klappen");
@@ -81,11 +81,8 @@ pub const PEN_WIDTH_PRESETS: [(f32, &str); 4] = [
 ];

 /// Dicken-Presets für den Textmarker:
-pub const HIGHLIGHTER_WIDTH_PRESETS: [(f32, &str); 3] = [
-    (4.0, "4.0 mm"),
-    (6.0, "6.0 mm"),
-    (8.0, "8.0 mm"),
-];
+pub const HIGHLIGHTER_WIDTH_PRESETS: [(f32, &str); 3] =
+    [(4.0, "4.0 mm"), (6.0, "6.0 mm"), (8.0, "8.0 mm")];

 /// Aktionen, die von der UI an die Anwendungslogik signalisiert werden.
 #[derive(Debug, Clone, PartialEq)]
@@ -111,7 +108,10 @@ pub enum UiAction {
    // Dokumenten- & Notizbuch-Verwaltung
    OpenNotebook(String),
    CreateNotebook(String),
-    RenameNotebook { id: String, new_title: String },
+    RenameNotebook {
+        id: String,
+        new_title: String,
+    },
    DeleteNotebook(String),
    RefreshNotebooks,
    // Gitea Release & Updater
@@ -119,7 +119,10 @@ pub enum UiAction {
    DownloadUpdateAsset(crate::updater::GiteaAsset),
    InstallOrOpenUpdate(std::path::PathBuf),
    OpenUrlInBrowser(String),
-    SaveUpdaterConfig { server_url: String, auth_token: Option<String> },
+    SaveUpdaterConfig {
+        server_url: String,
+        auth_token: Option<String>,
+    },
 }

 /// Zustand der grafischen Benutzeroberfläche.
@@ -157,6 +160,8 @@ pub struct UiState {
    pub updater_token_input: String,
    pub show_updater_config: bool,
    pub update_modal_rect: Option<egui::Rect>,
+    /// Steuert, ob Touch-Eingaben mit einem Finger zeichnen oder das Dokument verschieben (Default: false = reine Gesten-Navigation & Zoom)
+    pub touch_draw_enabled: bool,
 }

 impl Default for UiState {
@@ -187,6 +192,7 @@ impl Default for UiState {
            updater_token_input: String::new(),
            show_updater_config: false,
            update_modal_rect: None,
+            touch_draw_enabled: false,
        }
    }
 }
@@ -312,25 +318,36 @@ fn tool_pill_button_with_indicator(
            (
                egui::Color32::from_rgba_premultiplied(45, 80, 145, 230),
                egui::Color32::WHITE,
-                egui::Stroke::new(1.0_f32, egui::Color32::from_rgba_premultiplied(110, 165, 255, 190)),
+                egui::Stroke::new(
+                    1.0_f32,
+                    egui::Color32::from_rgba_premultiplied(110, 165, 255, 190),
+                ),
            )
        } else if response.hovered() {
            (
                egui::Color32::from_rgba_premultiplied(255, 255, 255, 16),
                egui::Color32::WHITE,
-                egui::Stroke::new(1.0_f32, egui::Color32::from_rgba_premultiplied(255, 255, 255, 25)),
+                egui::Stroke::new(
+                    1.0_f32,
+                    egui::Color32::from_rgba_premultiplied(255, 255, 255, 25),
+                ),
            )
        } else {
            (
                egui::Color32::from_rgba_premultiplied(255, 255, 255, 8),
                egui::Color32::from_gray(215),
-                egui::Stroke::new(1.0_f32, egui::Color32::from_rgba_premultiplied(255, 255, 255, 15)),
+                egui::Stroke::new(
+                    1.0_f32,
+                    egui::Color32::from_rgba_premultiplied(255, 255, 255, 15),
+                ),
            )
        };

        // Button-Hintergrund
-        ui.painter().rect_filled(rect, egui::Rounding::same(8.0), bg);
-        ui.painter().rect_stroke(rect, egui::Rounding::same(8.0), stroke);
+        ui.painter()
+            .rect_filled(rect, egui::Rounding::same(8.0), bg);
+        ui.painter()
+            .rect_stroke(rect, egui::Rounding::same(8.0), stroke);

        // Text & Caret
        let label = if is_menu_open {
@@ -359,7 +376,8 @@ fn tool_pill_button_with_indicator(
            (indicator_color[2] * 255.0) as u8,
            ((indicator_color[3] * 255.0) as u8).max(180),
        );
-        ui.painter().rect_filled(bar_rect, egui::Rounding::same(1.5), bar_color);
+        ui.painter()
+            .rect_filled(bar_rect, egui::Rounding::same(1.5), bar_color);
    }

    response.on_hover_text(tooltip)
@@ -376,13 +394,19 @@ fn tool_pill_button(
        (
            egui::Color32::from_rgba_premultiplied(45, 80, 145, 230),
            egui::Color32::WHITE,
-            egui::Stroke::new(1.0_f32, egui::Color32::from_rgba_premultiplied(110, 165, 255, 190)),
+            egui::Stroke::new(
+                1.0_f32,
+                egui::Color32::from_rgba_premultiplied(110, 165, 255, 190),
+            ),
        )
    } else {
        (
            egui::Color32::from_rgba_premultiplied(255, 255, 255, 8),
            egui::Color32::from_gray(215),
-            egui::Stroke::new(1.0_f32, egui::Color32::from_rgba_premultiplied(255, 255, 255, 15)),
+            egui::Stroke::new(
+                1.0_f32,
+                egui::Color32::from_rgba_premultiplied(255, 255, 255, 15),
+            ),
        )
    };

@@ -415,22 +439,33 @@ fn stroke_preview_button(
        let (bg, border) = if is_active {
            (
                egui::Color32::from_rgba_premultiplied(50, 85, 150, 220),
-                egui::Stroke::new(1.0_f32, egui::Color32::from_rgba_premultiplied(120, 175, 255, 200)),
+                egui::Stroke::new(
+                    1.0_f32,
+                    egui::Color32::from_rgba_premultiplied(120, 175, 255, 200),
+                ),
            )
        } else if response.hovered() {
            (
                egui::Color32::from_rgba_premultiplied(255, 255, 255, 16),
-                egui::Stroke::new(1.0_f32, egui::Color32::from_rgba_premultiplied(255, 255, 255, 25)),
+                egui::Stroke::new(
+                    1.0_f32,
+                    egui::Color32::from_rgba_premultiplied(255, 255, 255, 25),
+                ),
            )
        } else {
            (
                egui::Color32::from_rgba_premultiplied(255, 255, 255, 8),
-                egui::Stroke::new(1.0_f32, egui::Color32::from_rgba_premultiplied(255, 255, 255, 14)),
+                egui::Stroke::new(
+                    1.0_f32,
+                    egui::Color32::from_rgba_premultiplied(255, 255, 255, 14),
+                ),
            )
        };

-        ui.painter().rect_filled(rect, egui::Rounding::same(6.0), bg);
-        ui.painter().rect_stroke(rect, egui::Rounding::same(6.0), border);
+        ui.painter()
+            .rect_filled(rect, egui::Rounding::same(6.0), bg);
+        ui.painter()
+            .rect_stroke(rect, egui::Rounding::same(6.0), border);

        // Horizontale Vorschau-Linie zeichnen
        let line_thickness = (stroke_width_mm * 2.5).clamp(1.0, 9.0);
@@ -456,7 +491,11 @@ fn stroke_preview_button(
            egui::Align2::CENTER_CENTER,
            label_text,
            egui::FontId::proportional(10.0),
-            if is_active { egui::Color32::WHITE } else { egui::Color32::from_gray(190) },
+            if is_active {
+                egui::Color32::WHITE
+            } else {
+                egui::Color32::from_gray(190)
+            },
        );
    }

@@ -464,34 +503,32 @@ fn stroke_preview_button(
 }

 /// Kompakter Strichbreiten-Preset-Button für die Haupt-Toolbar.
-fn preset_width_button(
-    ui: &mut egui::Ui,
-    is_active: bool,
-    text: &str,
-) -> egui::Response {
+fn preset_width_button(ui: &mut egui::Ui, is_active: bool, text: &str) -> egui::Response {
    let (bg, text_color, stroke) = if is_active {
        (
            egui::Color32::from_rgba_premultiplied(50, 85, 150, 230),
            egui::Color32::WHITE,
-            egui::Stroke::new(1.0_f32, egui::Color32::from_rgba_premultiplied(120, 175, 255, 190)),
+            egui::Stroke::new(
+                1.0_f32,
+                egui::Color32::from_rgba_premultiplied(120, 175, 255, 190),
+            ),
        )
    } else {
        (
            egui::Color32::from_rgba_premultiplied(255, 255, 255, 6),
            egui::Color32::from_gray(190),
-            egui::Stroke::new(1.0_f32, egui::Color32::from_rgba_premultiplied(255, 255, 255, 12)),
+            egui::Stroke::new(
+                1.0_f32,
+                egui::Color32::from_rgba_premultiplied(255, 255, 255, 12),
+            ),
        )
    };

-    let button = egui::Button::new(
-        egui::RichText::new(text)
-            .color(text_color)
-            .size(11.5),
-    )
-    .fill(bg)
-    .stroke(stroke)
-    .rounding(egui::Rounding::same(6.0))
-    .min_size(egui::vec2(0.0, 24.0));
+    let button = egui::Button::new(egui::RichText::new(text).color(text_color).size(11.5))
+        .fill(bg)
+        .stroke(stroke)
+        .rounding(egui::Rounding::same(6.0))
+        .min_size(egui::vec2(0.0, 24.0));

    ui.add(button)
 }
@@ -512,24 +549,26 @@ fn action_pill_button(
    let (bg, stroke) = if enabled {
        (
            egui::Color32::from_rgba_premultiplied(255, 255, 255, 10),
-            egui::Stroke::new(1.0_f32, egui::Color32::from_rgba_premultiplied(255, 255, 255, 22)),
+            egui::Stroke::new(
+                1.0_f32,
+                egui::Color32::from_rgba_premultiplied(255, 255, 255, 22),
+            ),
        )
    } else {
        (
            egui::Color32::from_rgba_premultiplied(255, 255, 255, 3),
-            egui::Stroke::new(1.0_f32, egui::Color32::from_rgba_premultiplied(255, 255, 255, 8)),
+            egui::Stroke::new(
+                1.0_f32,
+                egui::Color32::from_rgba_premultiplied(255, 255, 255, 8),
+            ),
        )
    };

-    let button = egui::Button::new(
-        egui::RichText::new(text)
-            .color(text_color)
-            .size(12.5),
-    )
-    .fill(bg)
-    .stroke(stroke)
-    .rounding(egui::Rounding::same(7.0))
-    .min_size(egui::vec2(0.0, 26.0));
+    let button = egui::Button::new(egui::RichText::new(text).color(text_color).size(12.5))
+        .fill(bg)
+        .stroke(stroke)
+        .rounding(egui::Rounding::same(7.0))
+        .min_size(egui::vec2(0.0, 26.0));

    ui.add_enabled(enabled, button).on_hover_text(tooltip)
 }
@@ -541,7 +580,10 @@ fn toolbar_divider(ui: &mut egui::Ui) {
    ui.painter().vline(
        rect.center().x,
        rect.y_range(),
-        egui::Stroke::new(1.0_f32, egui::Color32::from_rgba_premultiplied(255, 255, 255, 25)),
+        egui::Stroke::new(
+            1.0_f32,
+            egui::Color32::from_rgba_premultiplied(255, 255, 255, 25),
+        ),
    );
    ui.add_space(2.0);
 }
@@ -911,7 +953,19 @@ pub fn render_ui(

                        toolbar_divider(ui);

-                        // --- 9. AUTOSAVE-STATUSANZEIGE ---
+                        // --- 9. TOUCH-MODUS UMSCHALTER (Gesten vs. Zeichnen) ---
+                        let (touch_icon, touch_tt) = if state.touch_draw_enabled {
+                            ("✏️ Touch: Stift", "Touch-Modus: Einzelfinger zeichnet, zwei Finger zoomen/verschieben. Klicken zum Umschalten auf reine Gesten-Navigation.")
+                        } else {
+                            ("🖐️ Touch: Zoom/Pan", "Touch-Modus: Finger zoomen und verschieben die Seite (ideal für Stifte wie Lazarite!). Klicken für Finger-Zeichnen.")
+                        };
+                        if action_pill_button(ui, true, touch_icon, touch_tt).clicked() {
+                            state.touch_draw_enabled = !state.touch_draw_enabled;
+                        }
+
+                        toolbar_divider(ui);
+
+                        // --- 10. AUTOSAVE-STATUSANZEIGE ---
                        let (dot_color, label_text) = match autosave_status {
                            AutosaveStatus::Saved => (egui::Color32::from_rgb(46, 204, 113), "Gespeichert"),
                            AutosaveStatus::Saving => (egui::Color32::from_rgb(241, 196, 15), "Speichert..."),
@@ -1014,14 +1068,22 @@ pub fn render_ui(
                                        .color(egui::Color32::WHITE)
                                        .size(12.5),
                                );
-                                ui.with_layout(egui::Layout::right_to_left(egui::Align::Center), |ui| {
-                                    if ui
-                                        .add(egui::Button::new(egui::RichText::new("✕").size(11.0)).frame(false))
-                                        .clicked()
-                                    {
-                                        state.is_pen_menu_open = false;
-                                    }
-                                });
+                                ui.with_layout(
+                                    egui::Layout::right_to_left(egui::Align::Center),
+                                    |ui| {
+                                        if ui
+                                            .add(
+                                                egui::Button::new(
+                                                    egui::RichText::new("✕").size(11.0),
+                                                )
+                                                .frame(false),
+                                            )
+                                            .clicked()
+                                        {
+                                            state.is_pen_menu_open = false;
+                                        }
+                                    },
+                                );
                            });

                            ui.add_space(8.0);
@@ -1040,7 +1102,8 @@ pub fn render_ui(
                                    let is_sel = (state.pen_color[0] - color[0]).abs() < 0.05
                                        && (state.pen_color[1] - color[1]).abs() < 0.05
                                        && (state.pen_color[2] - color[2]).abs() < 0.05;
-                                    if color_circle_swatch(ui, color, is_sel, label, 22.0).clicked() {
+                                    if color_circle_swatch(ui, color, is_sel, label, 22.0).clicked()
+                                    {
                                        state.pen_color = color;
                                        actions.push(UiAction::SetColor(color));
                                    }
@@ -1079,7 +1142,14 @@ pub fn render_ui(
                                ui.spacing_mut().item_spacing = egui::vec2(6.0, 0.0);
                                for (preset, label) in PEN_WIDTH_PRESETS {
                                    let is_sel = (state.pen_stroke_width_mm - preset).abs() < 0.05;
-                                    if stroke_preview_button(ui, is_sel, preset, label, state.pen_color).clicked()
+                                    if stroke_preview_button(
+                                        ui,
+                                        is_sel,
+                                        preset,
+                                        label,
+                                        state.pen_color,
+                                    )
+                                    .clicked()
                                    {
                                        state.pen_stroke_width_mm = preset;
                                        actions.push(UiAction::SetStrokeWidthMm(preset));
@@ -1145,14 +1215,22 @@ pub fn render_ui(
                                        .color(egui::Color32::WHITE)
                                        .size(12.5),
                                );
-                                ui.with_layout(egui::Layout::right_to_left(egui::Align::Center), |ui| {
-                                    if ui
-                                        .add(egui::Button::new(egui::RichText::new("✕").size(11.0)).frame(false))
-                                        .clicked()
-                                    {
-                                        state.is_highlighter_menu_open = false;
-                                    }
-                                });
+                                ui.with_layout(
+                                    egui::Layout::right_to_left(egui::Align::Center),
+                                    |ui| {
+                                        if ui
+                                            .add(
+                                                egui::Button::new(
+                                                    egui::RichText::new("✕").size(11.0),
+                                                )
+                                                .frame(false),
+                                            )
+                                            .clicked()
+                                        {
+                                            state.is_highlighter_menu_open = false;
+                                        }
+                                    },
+                                );
                            });

                            ui.add_space(8.0);
@@ -1168,10 +1246,12 @@ pub fn render_ui(
                            ui.horizontal(|ui| {
                                ui.spacing_mut().item_spacing = egui::vec2(8.0, 0.0);
                                for (color, label) in HIGHLIGHTER_COLOR_PRESETS {
-                                    let is_sel = (state.highlighter_color[0] - color[0]).abs() < 0.05
+                                    let is_sel = (state.highlighter_color[0] - color[0]).abs()
+                                        < 0.05
                                        && (state.highlighter_color[1] - color[1]).abs() < 0.05
                                        && (state.highlighter_color[2] - color[2]).abs() < 0.05;
-                                    if color_circle_swatch(ui, color, is_sel, label, 22.0).clicked() {
+                                    if color_circle_swatch(ui, color, is_sel, label, 22.0).clicked()
+                                    {
                                        state.highlighter_color = color;
                                        actions.push(UiAction::SetColor(color));
                                    }
@@ -1208,7 +1288,8 @@ pub fn render_ui(
                            ui.horizontal(|ui| {
                                ui.spacing_mut().item_spacing = egui::vec2(6.0, 0.0);
                                for (preset, label) in HIGHLIGHTER_WIDTH_PRESETS {
-                                    let is_sel = (state.highlighter_stroke_width_mm - preset).abs() < 0.1;
+                                    let is_sel =
+                                        (state.highlighter_stroke_width_mm - preset).abs() < 0.1;
                                    if stroke_preview_button(
                                        ui,
                                        is_sel,
@@ -1236,13 +1317,18 @@ pub fn render_ui(
                            ui.add_space(2.0);
                            if ui
                                .add(
-                                    egui::Slider::new(&mut state.highlighter_stroke_width_mm, 2.0..=16.0)
-                                        .suffix(" mm")
-                                        .step_by(0.5),
+                                    egui::Slider::new(
+                                        &mut state.highlighter_stroke_width_mm,
+                                        2.0..=16.0,
+                                    )
+                                    .suffix(" mm")
+                                    .step_by(0.5),
                                )
                                .changed()
                            {
-                                actions.push(UiAction::SetStrokeWidthMm(state.highlighter_stroke_width_mm));
+                                actions.push(UiAction::SetStrokeWidthMm(
+                                    state.highlighter_stroke_width_mm,
+                                ));
                            }
                        });

@@ -1299,16 +1385,18 @@ pub fn render_ui(
                );
                ui.separator();

-                egui::ScrollArea::vertical().max_height(220.0).show(ui, |ui| {
-                    for idx in 0..notebook.pages.len() {
-                        let is_current = idx == notebook.current_page_index;
-                        let text = format!("Seite {}", idx + 1);
-                        if tool_pill_button(ui, is_current, &text, "").clicked() {
-                            actions.push(UiAction::GoToPage(idx));
-                            state.show_page_jump_popup = false;
+                egui::ScrollArea::vertical()
+                    .max_height(220.0)
+                    .show(ui, |ui| {
+                        for idx in 0..notebook.pages.len() {
+                            let is_current = idx == notebook.current_page_index;
+                            let text = format!("Seite {}", idx + 1);
+                            if tool_pill_button(ui, is_current, &text, "").clicked() {
+                                actions.push(UiAction::GoToPage(idx));
+                                state.show_page_jump_popup = false;
+                            }
                        }
-                    }
-                });
+                    });

                ui.separator();
                if action_pill_button(ui, true, "Schließen", "Fenster schließen").clicked() {
@@ -1471,13 +1559,13 @@ pub fn render_ui(
                                            });

                                            ui.with_layout(egui::Layout::right_to_left(egui::Align::Center), |ui| {
-                                                if state.available_notebooks.len() > 1 {
-                                                    if ui.button(egui::RichText::new("🗑").size(11.0).color(egui::Color32::from_rgb(255, 120, 120)))
+                                                if state.available_notebooks.len() > 1
+                                                    && ui
+                                                        .button(egui::RichText::new("🗑").size(11.0).color(egui::Color32::from_rgb(255, 120, 120)))
                                                        .on_hover_text("Notizbuch unwiderruflich löschen")
                                                        .clicked()
-                                                    {
-                                                        actions.push(UiAction::DeleteNotebook(summary.id.clone()));
-                                                    }
+                                                {
+                                                    actions.push(UiAction::DeleteNotebook(summary.id.clone()));
                                                }

                                                if ui.button(egui::RichText::new("✏").size(11.0))
@@ -1701,10 +1789,10 @@ pub fn render_ui(
                            }

                            ui.add_space(8.0);
-                            if !release.html_url.is_empty() {
-                                if ui.button(egui::RichText::new("🌐 Release auf Gitea öffnen").size(12.0)).clicked() {
-                                    actions.push(UiAction::OpenUrlInBrowser(release.html_url.clone()));
-                                }
+                            if !release.html_url.is_empty()
+                                && ui.button(egui::RichText::new("🌐 Release auf Gitea öffnen").size(12.0)).clicked()
+                            {
+                                actions.push(UiAction::OpenUrlInBrowser(release.html_url.clone()));
                            }
                        });
                    }
@@ -1810,7 +1898,12 @@ pub fn render_ui(
                .order(egui::Order::Tooltip)
                .show(ctx, |ui| {
                    egui::Frame::none()
-                        .fill(egui::Color32::from_rgba_unmultiplied(20, 25, 30, alpha.min(235)))
+                        .fill(egui::Color32::from_rgba_unmultiplied(
+                            20,
+                            25,
+                            30,
+                            alpha.min(235),
+                        ))
                        .rounding(egui::Rounding::same(10.0))
                        .stroke(egui::Stroke::new(
                            1.0_f32,
@@ -1826,7 +1919,9 @@ pub fn render_ui(
                        .show(ui, |ui| {
                            ui.label(
                                egui::RichText::new(format!("✓ {}", msg))
-                                    .color(egui::Color32::from_rgba_unmultiplied(220, 255, 230, alpha))
+                                    .color(egui::Color32::from_rgba_unmultiplied(
+                                        220, 255, 230, alpha,
+                                    ))
                                    .size(13.0)
                                    .strong(),
                            );
@@ -2003,4 +2098,13 @@ mod tests {
            assert!(state.is_point_in_ui(rect.center().x, rect.center().y));
        }
    }
+
+    #[test]
+    fn test_touch_draw_mode_toggle() {
+        let mut state = UiState::new();
+        assert!(!state.touch_draw_enabled); // Default: false = Gesten-Navigation & Zoom
+
+        state.touch_draw_enabled = true;
+        assert!(state.touch_draw_enabled);
+    }
 }
@@ -3,8 +3,8 @@
 //! Berechnet die affine Transformation zwischen Bildschirmkoordinaten (Window-Pixel),
 //! virtuellen DIN-A4-Seitenkoordinaten ([0, 2100] x [0, 2970]) und dem GPU-NDC-Raum ([-1, 1]).

-use glam::{Mat4, Vec2, Vec4};
 use crate::document::{PageViewport, PAGE_HEIGHT, PAGE_WIDTH};
+use glam::{Mat4, Vec2, Vec4};

 /// Minimaler und maximaler Zoomfaktor.
 pub const MIN_ZOOM: f32 = 0.25;
@@ -40,7 +40,12 @@ impl ViewportState {
    }

    /// Passt den Pan-Offset um eine Bildschirmverschiebung (in Fensterpixeln) an.
-    pub fn pan_by_screen_delta(&mut self, delta_x: f32, delta_y: f32, page_viewport: &PageViewport) {
+    pub fn pan_by_screen_delta(
+        &mut self,
+        delta_x: f32,
+        delta_y: f32,
+        page_viewport: &PageViewport,
+    ) {
        let base_scale = page_viewport.page_width / PAGE_WIDTH;
        if base_scale * self.zoom > 1e-6 {
            self.pan_offset[0] += delta_x / (base_scale * self.zoom);
@@ -122,10 +127,7 @@ impl ViewportState {
        page_viewport: &PageViewport,
    ) -> Vec2 {
        let pt = self.screen_to_page_unclamped(screen_x, screen_y, page_viewport);
-        Vec2::new(
-            pt.x.clamp(0.0, PAGE_WIDTH),
-            pt.y.clamp(0.0, PAGE_HEIGHT),
-        )
+        Vec2::new(pt.x.clamp(0.0, PAGE_WIDTH), pt.y.clamp(0.0, PAGE_HEIGHT))
    }

    /// Transformiert einen DIN-A4-Seitenpunkt in Fenster-Pixelkoordinaten.
@@ -244,4 +246,40 @@ mod tests {
        assert!((offset1[0] - offset2[0]).abs() < 1e-5);
        assert!((offset1[1] - offset2[1]).abs() < 1e-5);
    }
+
+    #[test]
+    fn test_pinch_to_zoom_math() {
+        let mut vp = ViewportState::new();
+        let page_vp = PageViewport::calculate(1920.0, 1080.0, 24.0);
+
+        // Simulation von 2 Fingern:
+        // Finger 1 bei (400, 500), Finger 2 bei (600, 500) -> Distanz: 200, Zentrum: (500, 500)
+        let p1_start = (400.0_f32, 500.0_f32);
+        let p2_start = (600.0_f32, 500.0_f32);
+        let dist_start =
+            ((p2_start.0 - p1_start.0).powi(2) + (p2_start.1 - p1_start.1).powi(2)).sqrt();
+        let center_start = (
+            (p1_start.0 + p2_start.0) * 0.5,
+            (p1_start.1 + p2_start.1) * 0.5,
+        );
+        assert_eq!(dist_start, 200.0);
+        assert_eq!(center_start, (500.0, 500.0));
+
+        // Finger auseinanderziehen und leicht verschieben:
+        // Finger 1 bei (350, 520), Finger 2 bei (650, 520) -> Distanz: 300, Zentrum: (500, 520)
+        let p1_end = (350.0_f32, 520.0_f32);
+        let p2_end = (650.0_f32, 520.0_f32);
+        let dist_end = ((p2_end.0 - p1_end.0).powi(2) + (p2_end.1 - p1_end.1).powi(2)).sqrt();
+        let center_end = ((p1_end.0 + p2_end.0) * 0.5, (p1_end.1 + p2_end.1) * 0.5);
+        assert_eq!(dist_end, 300.0);
+        assert_eq!(center_end, (500.0, 520.0));
+
+        let zoom_factor = dist_end / dist_start; // 1.5x Vergrößerung
+        let pan_delta = (center_end.0 - center_start.0, center_end.1 - center_start.1); // (0, +20)
+
+        vp.pan_by_screen_delta(pan_delta.0, pan_delta.1, &page_vp);
+        vp.zoom_at_cursor([center_end.0, center_end.1], zoom_factor, &page_vp);
+
+        assert!((vp.zoom - 1.5).abs() < 1e-4);
+    }
 }
Author	SHA1	Message	Date
harald	f9b39c6fe3	chore(release): bump version to 0.1.1 Build & Publish Release / Build Packages & Publish to Gitea (push) Failing after 1m22s Details	2026-10-06 15:59:01 +02:00
harald	f9ebcb0296	fix(ci): remove all duplicate assets before re-uploading in publish-gitea-release.sh Build & Publish Release / Build Packages & Publish to Gitea (push) Failing after 1m19s Details	2026-10-06 15:43:11 +02:00
harald	df72981a9a	feat(input): Wayland-Tablet-Protokoll für aktive Stifte (Lazarite) und Touchscreen-Pinch-to-Zoom Build & Publish Release / Build Packages & Publish to Gitea (push) Failing after 2m0s Details	2026-10-06 14:58:59 +02:00
harald	5cb77b9af7	feat(ui): Sichere Shortcuts, dediziertes Ctrl+S Speichern und kollisionsfreier PDF-Export	2026-10-06 12:56:39 +02:00
harald	bb0faf424b	chore(meta): Lizenzdatei, Cargo-Metadaten und bereinigte Dokumentation	2026-10-06 12:40:52 +02:00
harald	3999996e98	fix(packaging): Debian-Paket-Abhängigkeiten, AppStream-Metadaten und reproduzierbares AppImage-Build	2026-10-06 12:36:10 +02:00
harald	3eb21dadc4	fix(scripts): Idempotentes Release-Publishing und robuste Template-Payloads	2026-10-06 12:26:37 +02:00
harald	5780c266b7	ci(gitea): Strikte Quality-Gates und sichere Token-Übergabe in Release-Workflow	2026-10-06 12:24:33 +02:00
harald	91e2d78b4f	fix(updater): Sichere In-App Updates mit ureq, SHA256-Integrität und atomarem AppImage-Tausch	2026-10-06 12:23:14 +02:00