feat: add executable builds for Linux, macOS, and Windows to release workflow

- Build PyInstaller executables for all platforms
- Keep Python distribution packages (wheel/sdist)
- Platform-specific executable naming and permissions

Author: VoxHash

.github/workflows/release.yml

@@ -33,12 +33,30 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           pip install -r requirements.txt
-          pip install build wheel
+          pip install pyinstaller build wheel
 
-      - name: Build distribution
+      - name: Build Python distribution
         run: |
           python -m build
 
+      - name: Build executable (Linux)
+        if: matrix.os == 'ubuntu-latest'
+        run: |
+          pyinstaller --onefile --windowed --name=BrowserBookmarkChecker --add-data "assets:assets" --add-data "bookmark_checker/i18n:bookmark_checker/i18n" --hidden-import=PyQt6 --hidden-import=rapidfuzz --hidden-import=bs4 bookmark_checker/__main__.py
+          chmod +x dist/BrowserBookmarkChecker
+
+      - name: Build executable (Windows)
+        if: matrix.os == 'windows-latest'
+        shell: bash
+        run: |
+          pyinstaller --onefile --windowed --name=BrowserBookmarkChecker --add-data "assets;assets" --add-data "bookmark_checker/i18n;bookmark_checker/i18n" --hidden-import=PyQt6 --hidden-import=rapidfuzz --hidden-import=bs4 bookmark_checker/__main__.py
+
+      - name: Build executable (macOS)
+        if: matrix.os == 'macos-latest'
+        run: |
+          pyinstaller --onefile --windowed --name=BrowserBookmarkChecker --add-data "assets:assets" --add-data "bookmark_checker/i18n:bookmark_checker/i18n" --hidden-import=PyQt6 --hidden-import=rapidfuzz --hidden-import=bs4 bookmark_checker/__main__.py
+          chmod +x dist/BrowserBookmarkChecker
+
       - name: Upload artifacts
         uses: actions/upload-artifact@v4
         with: