- Add validate_android_assets() function to build-android.sh
- Check for missing source assets (icon.png, splash.png, splash_dark.png)
- Verify Android resources exist (drawable/splash.png, mipmap/*/ic_launcher*.png)
- Auto-regenerate missing resources using @capacitor/assets
- Integrate validation into main build process with exit code 9
- Add npm run assets:validate:android for manual validation
- Support --assets-only flag for asset-only operations
- Create comprehensive documentation in doc/android-asset-validation.md
Fixes build failures caused by missing drawable/splash and mipmap/ic_launcher resources.
Prevents "Android resource linking failed" errors during Gradle builds.
Resolves: Android build failures due to missing asset resources
