refactor: move the event loop into the library as app::run (prep for Issue #42)

src/main.rs is now only the desktop entry point; the app itself lives in
src/app.rs, so other entry points such as android_main can start it. The code
is unchanged apart from crate:: paths; the source scans in the i18n and UI
tests and the docs point to app.rs.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/i18n.rs

@@ -156,7 +156,7 @@ mod tests {
         ("file_picker.rs", include_str!("file_picker.rs")),
         ("geometry.rs", include_str!("geometry.rs")),
         ("library.rs", include_str!("library.rs")),
-        ("main.rs", include_str!("main.rs")),
+        ("app.rs", include_str!("app.rs")),
         ("page_export.rs", include_str!("page_export.rs")),
         ("pdf_doc.rs", include_str!("pdf_doc.rs")),
         ("pdf_merge.rs", include_str!("pdf_merge.rs")),

src/lib.rs

@@ -1,5 +1,6 @@
 //! ink-notes: Latenzoptimierte Inking-App für Linux.
 
+pub mod app;
 pub mod assets;
 pub mod autosave;
 pub mod background;

src/storage.rs

@@ -2385,7 +2385,7 @@ mod tests {
             create_new_notebook(temp_dir.path(), "Neue Seiten").unwrap();
         let mut autosave = AutosaveController::new(dir.clone(), Duration::from_secs(60));
 
-        // Wie Taste N in main.rs: neue Seite anhängen, Strich darauf, speichern
+        // Wie Taste N in app.rs: neue Seite anhängen, Strich darauf, speichern
         notebook.next_page();
         let idx = notebook.current_page_index;
         notebook.pages[idx] = page_with_one_stroke(notebook.pages[idx].id, PageBackground::Lined);

src/ui.rs

@@ -6133,7 +6133,7 @@ mod tests {
     const UI_SOURCES: [(&str, &str); 4] = [
         ("ui.rs", include_str!("ui.rs")),
         ("selection.rs", include_str!("selection.rs")),
-        ("main.rs", include_str!("main.rs")),
+        ("app.rs", include_str!("app.rs")),
         ("file_picker.rs", include_str!("file_picker.rs")),
     ];