fix: title bar buttons work with a finger on Wayland (Issue #36)

winit 0.29 draws the title bar itself on Wayland but only handles the
mouse there. A vendored copy of winit 0.29.15 (vendor/winit, used via
[patch.crates-io]) passes touches on the decorations to the frame like a
left click, so close, minimize and maximize work with a finger and
dragging the title bar moves the window.

CI no longer sets a global -D warnings, which would also apply to the
vendored crate; clippy still runs with -D warnings.

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

vendor/winit/src/platform/modifier_supplement.rs

@@ -0,0 +1,24 @@
+#![cfg(any(windows_platform, macos_platform, x11_platform, wayland_platform))]
+
+use crate::keyboard::Key;
+
+/// Additional methods for the `KeyEvent` which cannot be implemented on all
+/// platforms.
+pub trait KeyEventExtModifierSupplement {
+    /// Identical to `KeyEvent::text` but this is affected by <kbd>Ctrl</kbd>.
+    ///
+    /// For example, pressing <kbd>Ctrl</kbd>+<kbd>a</kbd> produces `Some("\x01")`.
+    fn text_with_all_modifiers(&self) -> Option<&str>;
+
+    /// This value ignores all modifiers including,
+    /// but not limited to <kbd>Shift</kbd>, <kbd>Caps Lock</kbd>,
+    /// and <kbd>Ctrl</kbd>. In most cases this means that the
+    /// unicode character in the resulting string is lowercase.
+    ///
+    /// This is useful for key-bindings / shortcut key combinations.
+    ///
+    /// In case `logical_key` reports `Dead`, this will still report the
+    /// key as `Character` according to the current keyboard layout. This value
+    /// cannot be `Dead`.
+    fn key_without_modifiers(&self) -> Key;
+}