feat: Add icon generation script and update README with new functionality

build/scripts/README.md

@@ -10,11 +10,36 @@ Automation scripts for building, releasing, and downloading WebDrop Bridge.
 | `download_release.sh` | Download installer from Forgejo via wget | macOS/Linux |
 | `build_windows.py` | Build Windows MSI installer | Windows |
 | `build_macos.sh` | Build macOS DMG installer | macOS |
+| `generate_icons.py` | Generate `.ico` + `.icns` from one PNG | All (macOS required for `.icns`) |
 | `create_release.ps1` | Create GitHub/Forgejo release | Windows |
 | `create_release.sh` | Create GitHub/Forgejo release | macOS/Linux |
 | `sync_remotes.ps1` | Sync git remotes | Windows |
 | `sync_version.py` | Manage version synchronization | All |
 
+## Icon Generation
+
+Use one master icon PNG and generate both platform formats:
+
+```bash
+python build/scripts/generate_icons.py
+```
+
+Defaults:
+- Source PNG: `resources/icons/app.png`
+- Windows icon: `resources/icons/app.ico`
+- macOS icon: `resources/icons/app.icns`
+
+Generate only one format:
+
+```bash
+python build/scripts/generate_icons.py --only ico
+python build/scripts/generate_icons.py --only icns
+```
+
+Requirements:
+- `Pillow` for `.ico` generation (`pip install -r requirements-dev.txt`)
+- macOS `sips` + `iconutil` for `.icns`
+
 ## Download Scripts
 
 ### Purpose