v1.0.23: functional Files tab, background service persistence, startup indexer, curved icon

- FilesScreen: per-file context menu (Open, Share, Rename, Delete), rename dialog,
  delete confirmation, FileProvider-based open/share intents, Snackbar error feedback
- FilesViewModel: FileAction sealed class + SharedFlow; openFile, shareFile,
  deleteFile, renameFile with DB cleanup; resolveFile handles SAF primary: URIs
- FileWatchService: stopWithTask=false keeps watcher alive after app swipe-away;
  catchupScan on startup detects changes missed while service was not running;
  SyncFileStateDao injected; FileObserver used for real-path SAF URIs
- BootReceiver: handles MY_PACKAGE_REPLACED to restart service after app update
- file_paths.xml: added external-path so FileProvider can serve /storage/emulated/0 files
- ic_launcher_foreground: three curved stroke-based arrows (quadratic bezier, round caps)

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

app/src/main/AndroidManifest.xml

@@ -66,13 +66,16 @@
             android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.BOOT_COMPLETED" />
+                <action android:name="android.intent.action.MY_PACKAGE_REPLACED" />
             </intent-filter>
         </receiver>
 
         <!-- File watcher for ON_CHANGE sync pairs -->
+        <!-- stopWithTask=false keeps the service alive when the user swipes the app away -->
         <service
             android:name=".worker.FileWatchService"
             android:foregroundServiceType="dataSync|shortService"
+            android:stopWithTask="false"
             android:exported="false" />
 
         <!-- Required on API 29+ so WorkManager can start a typed foreground service -->