fix: AppImage EGL crash on modern distros, update link capability (v1.4.2)

- Switch Linux CI build from ubuntu-22.04 to ubuntu-24.04 — bundles
  WebKitGTK 2.44 which uses eglGetPlatformDisplay instead of the
  deprecated eglGetDisplay(EGL_DEFAULT_DISPLAY) that fails on Mesa 25.x
  (CachyOS/Arch with RDNA 4 and other modern hardware)
- Add EGL_PLATFORM=x11 to AppRun as additional safeguard for XWayland
- Fix shell:allow-open capability missing URL scope (update toast link
  was silently blocked by Tauri v2 without explicit allow-list)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.github/workflows/release.yml

@@ -89,7 +89,7 @@ jobs:
     needs: create-release
     permissions:
       contents: write
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@v5
 
@@ -129,7 +129,7 @@ jobs:
           APPIMAGE=$(find src-tauri/target/release/bundle/appimage -name "*.AppImage" -not -name "*.tar.gz" | head -1)
           echo "Patching: $APPIMAGE"
           APPIMAGE_EXTRACT_AND_RUN=1 ./"$APPIMAGE" --appimage-extract
-          sed -i '/^exec /i export WEBKIT_DISABLE_COMPOSITING_MODE=1\nexport WEBKIT_DISABLE_DMABUF_RENDERER=1\nexport GDK_BACKEND=x11' squashfs-root/AppRun
+          sed -i '/^exec /i export WEBKIT_DISABLE_COMPOSITING_MODE=1\nexport WEBKIT_DISABLE_DMABUF_RENDERER=1\nexport GDK_BACKEND=x11\nexport EGL_PLATFORM=x11' squashfs-root/AppRun
           wget -q "https://github.com/AppImage/AppImageKit/releases/download/continuous/appimagetool-x86_64.AppImage" \
             -O appimagetool
           chmod +x appimagetool