v1.0.15: ON_CHANGE file watching, browser fix, rich notifications

- Add FileWatchService for real-time ON_CHANGE sync (FileObserver for
  direct paths, ContentObserver for SAF content:// URIs), 5s debounce
- Fix remote browser stuck spinner: cancel in-flight jobs on navigation,
  reset entries immediately, add Retry button on error
- Fix browser reuse bug: LaunchedEffect key now includes initialPath
- Fix WebDavProvider: rethrow XML parse errors (no more silent Empty
  folder) and URL-decode file names from href
- Notifications now use BigTextStyle showing per-file-type counts
  (Uploaded/Downloaded/Deleted) matching Autosync notification style
- Wire FileWatchService into BootReceiver and HomeViewModel toggle
- Register FileWatchService in AndroidManifest

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/src/main/AndroidManifest.xml

@@ -68,6 +68,12 @@
             </intent-filter>
         </receiver>
 
+        <!-- File watcher for ON_CHANGE sync pairs -->
+        <service
+            android:name=".worker.FileWatchService"
+            android:foregroundServiceType="dataSync"
+            android:exported="false" />
+
         <!-- Required on API 29+ so WorkManager can start a typed foreground service -->
         <service
             android:name="androidx.work.impl.foreground.SystemForegroundService"