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/kotlin/com/syncflow/ui/home/HomeViewModel.kt

@@ -1,13 +1,17 @@
 package com.syncflow.ui.home
 
+import android.content.Context
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
+import androidx.work.ExistingPeriodicWorkPolicy
 import androidx.work.WorkManager
 import com.syncflow.data.db.SyncPairDao
 import com.syncflow.data.db.entities.SyncPairEntity
 import com.syncflow.domain.model.ScheduleType
+import com.syncflow.worker.FileWatchService
 import com.syncflow.worker.SyncWorker
 import dagger.hilt.android.lifecycle.HiltViewModel
+import dagger.hilt.android.qualifiers.ApplicationContext
 import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.stateIn
 import kotlinx.coroutines.launch
@@ -17,6 +21,7 @@ import javax.inject.Inject
 class HomeViewModel @Inject constructor(
     private val syncPairDao: SyncPairDao,
     private val workManager: WorkManager,
+    @ApplicationContext private val context: Context,
 ) : ViewModel() {
 
     val syncPairs = syncPairDao.observeAll()
@@ -29,21 +34,28 @@ class HomeViewModel @Inject constructor(
 
     fun toggleEnabled(pair: SyncPairEntity) {
         viewModelScope.launch {
-            syncPairDao.update(pair.copy(isEnabled = !pair.isEnabled))
-            if (!pair.isEnabled && pair.scheduleType != ScheduleType.MANUAL) {
-                val req = SyncWorker.buildPeriodicRequest(
-                    pair.id,
-                    pair.scheduleIntervalMinutes.toLong().coerceAtLeast(15),
-                    pair.wifiOnly,
-                    pair.chargingOnly,
-                )
-                workManager.enqueueUniquePeriodicWork(
-                    "periodic_${pair.id}",
-                    androidx.work.ExistingPeriodicWorkPolicy.UPDATE,
-                    req,
-                )
+            val nowEnabled = !pair.isEnabled
+            syncPairDao.update(pair.copy(isEnabled = nowEnabled))
+            if (nowEnabled) {
+                when (pair.scheduleType) {
+                    ScheduleType.ON_CHANGE -> FileWatchService.start(context)
+                    ScheduleType.MANUAL -> { /* nothing */ }
+                    else -> {
+                        val req = SyncWorker.buildPeriodicRequest(
+                            pair.id,
+                            pair.scheduleIntervalMinutes.toLong().coerceAtLeast(15),
+                            pair.wifiOnly,
+                            pair.chargingOnly,
+                        )
+                        workManager.enqueueUniquePeriodicWork("periodic_${pair.id}", ExistingPeriodicWorkPolicy.UPDATE, req)
+                    }
+                }
             } else {
                 workManager.cancelAllWorkByTag("sync_${pair.id}")
+                // Refresh watcher (it will stop itself if no ON_CHANGE pairs remain)
+                if (pair.scheduleType == ScheduleType.ON_CHANGE) {
+                    FileWatchService.start(context)
+                }
             }
         }
     }