* [Android] Bug fixes and performance improvements:
  - Fixes a potential UI freeze during application startup
  - Prevents App Not Responding (ANR) crashes when tapping notification actions (Cancel/Pause/Resume) under heavy system load
  - Fixes group notifications running in the foreground (issue #648)
  - Migrated build configuration to Flutter's built-in Kotlin Gradle plugin configuration and upgraded Gradle to 8.14
* [iOS] Group notification and permission improvements:
  - Fixes redundant updates and visual "flashing" of group notifications (fixes #656)
  - Migrated the example app to native Swift Package Manager (SPM) and added environment-variable-based compile-time permission bypass flags for SPM users
  - Removed 'Background Fetch' requirement from documentation and example plist files, preventing unexpected wake-ups when the device is locked and resolving potential keychain access issues (fixes #668)
* [Desktop] Temp directory fallback:
  - Added fallback to the target download directory on desktop platforms when the system temporary directory is inaccessible (e.g., in macOS app sandbox mode, fixes #649)
* [Chore / Maintenance] Code formatting updated to match the latest Dart formatter