- Added generated ashell.png, ashell.icns, and ashell.ico to assets/icons/
- Configured gpui WindowOptions to embed and display the icon for Linux
- Added winres build dependency and build.rs to embed Windows .ico into the executable
- Updated package-macos-app.sh and release.yml to bundle macOS .icns into the .app bundle
- Removed manual copying of icons into release zip/tarballs since they are now embedded
