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/kotlin/com/syncflow/worker/BootReceiver.kt

@@ -18,7 +18,8 @@ class BootReceiver : BroadcastReceiver() {
     @Inject lateinit var syncPairDao: SyncPairDao
 
     override fun onReceive(context: Context, intent: Intent) {
-        if (intent.action != Intent.ACTION_BOOT_COMPLETED) return
+        val validActions = setOf(Intent.ACTION_BOOT_COMPLETED, Intent.ACTION_MY_PACKAGE_REPLACED)
+        if (intent.action !in validActions) return
         val wm = WorkManager.getInstance(context)
         val pending = goAsync()
         CoroutineScope(Dispatchers.IO).launch {