v1.0.29: fix sync loop, stale-state auto-heal, icon redesign

- SyncEngine: self-healing stale folder state detection (isRetry) wipes
  orphaned SyncFileStateEntity records when localPath changes without a
  pair re-save — prevents repeated DELETE_REMOTE on 32 old files
- SyncEngine: second-precision mtime comparison (/ 1000 / .epochSecond)
  eliminates phantom localChanged=true from FAT32/WebDAV precision mismatch
- FileWatchService: syncCooldownUntil map suppresses FileObserver events
  for 120s after sync starts and 60s after it finishes, breaking the
  download→FileObserver→sync→download feedback loop
- Icon: three bold teardrop shapes (teal/red/amber) rotated 0/120/240°
  on dark charcoal background with white cloud at intersection

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

app/src/main/kotlin/com/syncflow/worker/FileWatchService.kt

@@ -40,6 +40,9 @@ class FileWatchService : Service() {
     private val fileObservers = mutableMapOf<Long, MutableList<FileObserver>>()
     private val contentObservers = mutableMapOf<Long, ContentObserver>()
     private val debounceJobs = mutableMapOf<Long, Job>()
+    // After a watcher-triggered sync completes, suppress FileObserver events for this long
+    // to stop the feedback loop: sync writes files → FileObserver fires → another sync → repeat.
+    private val syncCooldownUntil = mutableMapOf<Long, Long>()
 
     companion object {
         const val CHANNEL_WATCH = "sync_watching"
@@ -210,6 +213,13 @@ class FileWatchService : Service() {
     }
 
     private fun onChangeDetected(pairId: Long, wifiOnly: Boolean, chargingOnly: Boolean) {
+        // Ignore events fired by our own sync writing files — prevents the feedback loop
+        // where downloaded/uploaded files trigger another sync indefinitely.
+        if (System.currentTimeMillis() < (syncCooldownUntil[pairId] ?: 0L)) {
+            Timber.d("FileWatchService: suppressing change event for pair $pairId (sync cooldown)")
+            return
+        }
+
         debounceJobs[pairId]?.cancel()
         debounceJobs[pairId] = scope.launch {
             delay(5_000)
@@ -217,19 +227,22 @@ class FileWatchService : Service() {
             if (pair == null || !pair.isEnabled) return@launch
             Timber.d("FileWatchService: triggering sync for pair $pairId after debounce")
 
+            // Block new triggers from this point until 60s after sync completes
+            syncCooldownUntil[pairId] = System.currentTimeMillis() + 120_000
+
             val req = SyncWorker.buildOneTimeRequest(pairId, wifiOnly, chargingOnly, silent = true)
             WorkManager.getInstance(applicationContext)
                 .enqueueUniqueWork("onchange_$pairId", ExistingWorkPolicy.KEEP, req)
 
-            // Update notification while sync is in progress
             updateNotificationDynamic("Syncing: ${pair.name}…")
 
-            // Wait for completion and show result in the persistent notification
             scope.launch {
                 try {
                     val info = WorkManager.getInstance(applicationContext)
                         .getWorkInfoByIdFlow(req.id)
                         .first { it?.state?.isFinished == true }
+                    // Extend cooldown: 60s after sync finishes to let filesystem settle
+                    syncCooldownUntil[pairId] = System.currentTimeMillis() + 60_000
                     val summary = info?.outputData?.getString(SyncWorker.KEY_RESULT_SUMMARY)
                     val watchCount = fileObservers.keys.size + contentObservers.size
                     val watching = "Watching $watchCount folder${if (watchCount != 1) "s" else ""}"
@@ -239,8 +252,9 @@ class FileWatchService : Service() {
                         updateNotificationDynamic("$watching")
                     }
                     delay(12_000)
-                    updateNotificationDynamic(null) // revert to default watching text
+                    updateNotificationDynamic(null)
                 } catch (_: Exception) {
+                    syncCooldownUntil[pairId] = 0L
                     updateNotificationDynamic(null)
                 }
             }
@@ -254,6 +268,7 @@ class FileWatchService : Service() {
         contentObservers.clear()
         debounceJobs.values.forEach { it.cancel() }
         debounceJobs.clear()
+        syncCooldownUntil.clear()
     }
 
     private fun ensureChannel() {