v1.0.30: fix sync loop root causes + icon redesign

Three root causes found via live logcat on device:

1. concurrent refresh() race: onStartCommand received twice causes two
   refresh() coroutines to run in parallel, doubling FileObserver and
   catchupScan registrations. Fixed with Mutex.withLock on refresh().

2. catchupScan no cooldown: catchup syncs write files but never set
   syncCooldownUntil, so every written file immediately re-triggers
   onChangeDetected. Fixed by setting cooldown before enqueue and
   watching work completion same as onChangeDetected does.

3. CancellationException caught silently: exception handler
   catch(_: Exception) was catching CancellationException and resetting
   cooldown to 0L, re-opening the loop. Fixed by rethrowing
   CancellationException and setting 60s cooldown on other errors.

Icon: interlocked rings (blue/red/green/orange) with sync arrow at
center, pure black background — matches reference image.

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

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

@@ -23,6 +23,8 @@ import com.syncflow.data.db.SyncPairDao
 import com.syncflow.domain.model.ScheduleType
 import dagger.hilt.android.AndroidEntryPoint
 import kotlinx.coroutines.*
+import kotlinx.coroutines.sync.Mutex
+import kotlinx.coroutines.sync.withLock
 import timber.log.Timber
 import java.io.File
 import javax.inject.Inject
@@ -35,6 +37,8 @@ class FileWatchService : Service() {
 
     private val scope = CoroutineScope(Dispatchers.IO + SupervisorJob())
     private val mainHandler = Handler(Looper.getMainLooper())
+    // Prevents concurrent refresh() calls from doubling watchers + catchup scans
+    private val refreshMutex = Mutex()
 
     // Multiple FileObserver instances per pair: one per directory (recursive)
     private val fileObservers = mutableMapOf<Long, MutableList<FileObserver>>()
@@ -81,7 +85,7 @@ class FileWatchService : Service() {
 
     override fun onBind(intent: Intent?): IBinder? = null
 
-    private suspend fun refresh() {
+    private suspend fun refresh() = refreshMutex.withLock {
         clearWatchers()
         val pairs = syncPairDao.getEnabled().filter { it.scheduleType == ScheduleType.ON_CHANGE }
 
@@ -203,12 +207,23 @@ class FileWatchService : Service() {
         if (hasNew || hasModified || hasDeleted) {
             Timber.d("FileWatchService: catchup detected changes for pair $pairId, scheduling sync")
             val pair = syncPairDao.getById(pairId) ?: return
+            // Set cooldown so file writes during this sync don't immediately re-trigger
+            syncCooldownUntil[pairId] = System.currentTimeMillis() + 120_000
+            val req = SyncWorker.buildOneTimeRequest(pairId, wifiOnly, chargingOnly)
             WorkManager.getInstance(applicationContext)
-                .enqueueUniqueWork(
-                    "catchup_$pairId",
-                    ExistingWorkPolicy.KEEP,
-                    SyncWorker.buildOneTimeRequest(pairId, wifiOnly, chargingOnly),
-                )
+                .enqueueUniqueWork("catchup_$pairId", ExistingWorkPolicy.KEEP, req)
+            scope.launch {
+                try {
+                    WorkManager.getInstance(applicationContext)
+                        .getWorkInfoByIdFlow(req.id)
+                        .first { it?.state?.isFinished == true }
+                    syncCooldownUntil[pairId] = System.currentTimeMillis() + 60_000
+                } catch (e: CancellationException) {
+                    throw e
+                } catch (_: Exception) {
+                    syncCooldownUntil[pairId] = System.currentTimeMillis() + 60_000
+                }
+            }
         }
     }
 
@@ -253,8 +268,10 @@ class FileWatchService : Service() {
                     }
                     delay(12_000)
                     updateNotificationDynamic(null)
+                } catch (e: CancellationException) {
+                    throw e
                 } catch (_: Exception) {
-                    syncCooldownUntil[pairId] = 0L
+                    syncCooldownUntil[pairId] = System.currentTimeMillis() + 60_000
                     updateNotificationDynamic(null)
                 }
             }

app/src/main/res/drawable/ic_launcher_background.xml

@@ -1,25 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:aapt="http://schemas.android.com/aapt"
     android:width="108dp"
     android:height="108dp"
     android:viewportWidth="108"
     android:viewportHeight="108">
 
-    <!-- Dark charcoal background, matching Avast-style dark icon bg -->
+    <!-- Pure black background -->
     <path android:pathData="M0,0 H108 V108 H0 Z"
-        android:fillColor="#1F1F2E"/>
-
-    <!-- Very subtle inner glow -->
-    <path android:pathData="M0,0 H108 V108 H0 Z"
-        android:fillAlpha="0.25">
-        <aapt:attr name="android:fillColor">
-            <gradient android:type="radial"
-                android:gradientRadius="60"
-                android:centerX="54" android:centerY="50"
-                android:startColor="#3D3A50"
-                android:endColor="#00000000"/>
-        </aapt:attr>
-    </path>
+        android:fillColor="#000000"/>
 
 </vector>

app/src/main/res/drawable/ic_launcher_foreground.xml

@@ -1,67 +1,76 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!--
-  SyncFlow icon foreground.
-  Three bold teardrop shapes in Avast-palette colors (teal, red, amber),
-  tips meeting at center (54,54), wide heads pointing outward at 0/120/240 deg.
-  White cloud centred over the intersection point.
--->
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="108dp"
     android:height="108dp"
     android:viewportWidth="108"
     android:viewportHeight="108">
 
-    <!-- Teal teardrop — head pointing straight up -->
-    <group android:rotation="0"
-        android:pivotX="54"
-        android:pivotY="54">
-        <path
-            android:fillColor="#00C4A7"
-            android:pathData="M 54,57 C 50,57 38,52 34,41 C 30,30 38,20 54,20 C 70,20 78,30 74,41 C 70,52 58,57 54,57 Z"/>
-    </group>
+    <!--
+      Four interlocked ring arcs (blue/red/green/orange), each a thick rounded band
+      arranged in a 2x2 offset so they interweave. A white sync-arrow circle sits
+      at the center. Designed to match the braided-knot reference icon.
+    -->
 
-    <!-- Red teardrop — head pointing lower-right (120 deg CW from up) -->
-    <group android:rotation="120"
-        android:pivotX="54"
-        android:pivotY="54">
-        <path
-            android:fillColor="#F44336"
-            android:pathData="M 54,57 C 50,57 38,52 34,41 C 30,30 38,20 54,20 C 70,20 78,30 74,41 C 70,52 58,57 54,57 Z"/>
-    </group>
+    <!-- Blue ring - top-left -->
+    <path
+        android:strokeColor="#2979FF"
+        android:strokeWidth="7"
+        android:fillColor="#00000000"
+        android:strokeLineCap="round"
+        android:pathData="M 38,36
+                          A 16,16 0 1,1 54,52
+                          A 16,16 0 1,1 38,36 Z"/>
 
-    <!-- Amber teardrop — head pointing lower-left (240 deg CW from up) -->
-    <group android:rotation="240"
-        android:pivotX="54"
-        android:pivotY="54">
-        <path
-            android:fillColor="#FFC107"
-            android:pathData="M 54,57 C 50,57 38,52 34,41 C 30,30 38,20 54,20 C 70,20 78,30 74,41 C 70,52 58,57 54,57 Z"/>
-    </group>
+    <!-- Red ring - top-right -->
+    <path
+        android:strokeColor="#F44336"
+        android:strokeWidth="7"
+        android:fillColor="#00000000"
+        android:strokeLineCap="round"
+        android:pathData="M 54,36
+                          A 16,16 0 1,1 70,52
+                          A 16,16 0 1,1 54,36 Z"/>
 
-    <!-- White cloud centred at (54,52), sits over the teardrop intersection -->
+    <!-- Green ring - bottom-left -->
+    <path
+        android:strokeColor="#00C853"
+        android:strokeWidth="7"
+        android:fillColor="#00000000"
+        android:strokeLineCap="round"
+        android:pathData="M 38,52
+                          A 16,16 0 1,1 54,68
+                          A 16,16 0 1,1 38,52 Z"/>
+
+    <!-- Orange ring - bottom-right -->
+    <path
+        android:strokeColor="#FF6D00"
+        android:strokeWidth="7"
+        android:fillColor="#00000000"
+        android:strokeLineCap="round"
+        android:pathData="M 54,52
+                          A 16,16 0 1,1 70,68
+                          A 16,16 0 1,1 54,52 Z"/>
+
+    <!-- White filled circle at center to create interlock illusion -->
+    <path
+        android:fillColor="#000000"
+        android:pathData="M 46,52 A 8,8 0 1,0 62,52 A 8,8 0 1,0 46,52 Z"/>
+
+    <!-- Sync arrow ring (outer white circle) -->
+    <path
+        android:strokeColor="#FFFFFF"
+        android:strokeWidth="3.5"
+        android:fillColor="#00000000"
+        android:pathData="M 47,52 A 7,7 0 1,0 61,52 A 7,7 0 1,0 47,52 Z"/>
+
+    <!-- Sync arrow head top -->
     <path
         android:fillColor="#FFFFFF"
-        android:pathData="
-          M 42,62
-          A 8,8 0 0,1 42,46
-          A 8,8 0 0,1 51,39
-          A 11,11 0 0,1 67,42
-          A 7,7 0 0,1 68,56
-          A 7,7 0 0,1 66,62
-          Z"/>
+        android:pathData="M 54,45 L 57,49 L 51,49 Z"/>
 
-    <!-- Cloud inner shadow to make it pop from the coloured teardrops -->
+    <!-- Sync arrow head bottom -->
     <path
-        android:fillColor="#00000000"
-        android:strokeColor="#18000000"
-        android:strokeWidth="1.5"
-        android:pathData="
-          M 42,62
-          A 8,8 0 0,1 42,46
-          A 8,8 0 0,1 51,39
-          A 11,11 0 0,1 67,42
-          A 7,7 0 0,1 68,56
-          A 7,7 0 0,1 66,62
-          Z"/>
+        android:fillColor="#FFFFFF"
+        android:pathData="M 54,59 L 51,55 L 57,55 Z"/>
 
 </vector>

version.properties

@@ -1,2 +1,2 @@
-VERSION_NAME=1.0.29
-VERSION_CODE=30
+VERSION_NAME=1.0.30
+VERSION_CODE=31