- Create SimpleNotesApplication class for app-level lifecycle
- Move NetworkMonitor from Activity to Application context
- Add comprehensive logging to NetworkMonitor (all callbacks)
- Add logging to SyncWorker for debugging
- Remove NetworkMonitor from MainActivity (now in Application)
- Add Battery Optimization dialog in SettingsActivity
- Improve Notifications (showSyncInProgress, showSyncSuccess, showSyncError)
This should fix background sync issues - NetworkMonitor now runs
with Application context instead of Activity context, which should
survive when app is in background.
Debug with: adb logcat | grep -E 'NetworkMonitor|SyncWorker|SimpleNotesApp'
