v1.0.28: fix sync rewrite/delete loop, Avast-inspired icon

Sync loop root-cause fixes (three independent bugs):

1. Folder change clears stale file states (AddPairViewModel): when
   localPath or remotePath changes on an existing pair, all
   SyncFileStateEntity records are wiped. Previously those stale records
   caused every sync to attempt DELETE_REMOTE on the old folder's files
   and to treat all new-folder files as changed — causing both the
   "deleting 32 files" loop and rewrites on every run.

2. Download stores null localModifiedAt (SyncEngine): SAF document
   cursors can return a stale mtime immediately after a write. Storing
   null forces the SKIP reconciliation pass on the next sync to read
   the actual walkFiles cursor value, breaking the download->changed->
   download loop caused by mtime inconsistency.

3. Second-precision mtime comparison (syncDecide): WebDAV RFC-1123 has
   1-second precision; FAT32 has 2-second precision. Comparing at
   millisecond level caused phantom "changed" detections after syncing
   to/from these systems. Now uses epochSecond for both local and remote.

Icon: three bold teal/red/yellow teardrop streaks (Avast palette) flying
into a white cloud centre, on dark charcoal background.

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

app/src/main/kotlin/com/syncflow/domain/sync/SyncEngine.kt

@@ -126,7 +126,9 @@ class SyncEngine @Inject constructor(
                                 logEvent(pair.id, SyncEventType.FILE_DOWNLOADED, rel, null, bytes)
                                 FileOutcome(downloaded = 1, bytesTransferred = bytes,
                                     newState = buildState(pair.id, rel,
-                                        LocalFileInfo(rel, remote!!.sizeBytes, localMtime), remoteAfterTransfer = remote))
+                                        LocalFileInfo(rel, remote!!.sizeBytes, localMtime),
+                                        remoteAfterTransfer = remote,
+                                        storeLocalMtime = false))
                             }
                             SyncDecision.DELETE_LOCAL -> {
                                 accessor.delete(rel)
@@ -203,10 +205,13 @@ class SyncEngine @Inject constructor(
         rel: String,
         local: LocalFileInfo?,
         remoteAfterTransfer: RemoteFile?,
+        storeLocalMtime: Boolean = true,
     ) = SyncFileStateEntity(
         syncPairId = pairId,
         relativePath = rel,
-        localModifiedAt = local?.lastModifiedMs?.let { Instant.ofEpochMilli(it) },
+        // When storeLocalMtime=false, leave localModifiedAt null so the SKIP reconciliation
+        // pass on the next sync reads it from the walkFiles cursor (avoids SAF stale-mtime loops).
+        localModifiedAt = if (storeLocalMtime) local?.lastModifiedMs?.let { Instant.ofEpochMilli(it) } else null,
         localSizeBytes = local?.sizeBytes ?: 0L,
         localHash = null,
         remoteModifiedAt = remoteAfterTransfer?.modifiedAt,
@@ -236,12 +241,16 @@ internal fun syncDecide(
 
     // Treat null known timestamps as "not yet recorded" — don't treat as changed.
     // The SKIP reconciliation pass will fill them in on the next sync.
+    // Use second-precision for both sides: FAT32 has 2-second mtime resolution, WebDAV
+    // RFC-1123 has 1-second resolution, so millisecond comparison causes phantom "changed"
+    // detections and rewrite loops after a fresh download/upload.
     val localChanged = known == null ||
         (localExists && known.localModifiedAt != null &&
-            local!!.lastModifiedMs != known.localModifiedAt.toEpochMilli())
+            local!!.lastModifiedMs / 1000 != known.localModifiedAt.epochSecond)
     val remoteChanged = known == null ||
         (remoteExists && known.remoteModifiedAt != null &&
-            (remote!!.etag != known.remoteEtag || remote.modifiedAt != known.remoteModifiedAt))
+            (remote!!.etag != known.remoteEtag ||
+             remote.modifiedAt.epochSecond != known.remoteModifiedAt.epochSecond))
 
     return when {
         !localExists && !remoteExists -> SyncDecision.SKIP

app/src/main/kotlin/com/syncflow/ui/addpair/AddPairViewModel.kt

@@ -5,6 +5,7 @@ import androidx.lifecycle.SavedStateHandle
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import com.syncflow.data.db.CloudAccountDao
+import com.syncflow.data.db.SyncFileStateDao
 import com.syncflow.data.db.SyncPairDao
 import com.syncflow.data.db.entities.CloudAccountEntity
 import com.syncflow.data.db.entities.SyncPairEntity
@@ -58,6 +59,7 @@ data class AddPairUiState(
 @HiltViewModel
 class AddPairViewModel @Inject constructor(
     private val syncPairDao: SyncPairDao,
+    private val fileStateDao: SyncFileStateDao,
     private val accountDao: CloudAccountDao,
     @ApplicationContext private val context: Context,
     savedState: SavedStateHandle,
@@ -148,7 +150,20 @@ class AddPairViewModel @Inject constructor(
                     notifyOnComplete = s.notifyOnComplete, notifyOnError = s.notifyOnError,
                     isEnabled = true, lastSyncAt = null, lastSyncResult = SyncStatus.IDLE, pendingConflicts = 0,
                 )
-                if (editPairId == null) syncPairDao.insert(entity) else syncPairDao.update(entity)
+                if (editPairId == null) {
+                    syncPairDao.insert(entity)
+                } else {
+                    val existing = syncPairDao.getById(editPairId)
+                    syncPairDao.update(entity)
+                    // If local or remote folder changed, old file-state records no longer
+                    // correspond to any real path — wipe them so the next sync starts fresh
+                    // instead of trying to delete/re-upload stale paths.
+                    if (existing != null &&
+                        (existing.localPath != entity.localPath || existing.remotePath != entity.remotePath)
+                    ) {
+                        fileStateDao.deleteForPair(editPairId)
+                    }
+                }
             }
                 .onSuccess {
                     if (s.scheduleType == ScheduleType.ON_CHANGE) FileWatchService.start(context)

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

@@ -6,14 +6,19 @@
     android:viewportWidth="108"
     android:viewportHeight="108">
 
-    <!-- Deep purple-black base, matching the knot reference icon's dark background -->
+    <!-- Dark charcoal background, matching Avast-style dark icon bg -->
-    <path android:pathData="M0,0 H108 V108 H0 Z">
+    <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="76"
+                android:gradientRadius="60"
-                android:centerX="54" android:centerY="44"
+                android:centerX="54" android:centerY="50"
-                android:startColor="#1E1628"
+                android:startColor="#3D3A50"
-                android:endColor="#080610"/>
+                android:endColor="#00000000"/>
         </aapt:attr>
     </path>
 

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

@@ -1,23 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!--
-  SyncFlow icon foreground (108x108dp, safe zone 72dp centred at 54,54).
+  SyncFlow icon foreground.
+  Design: three bold teardrop "speed streak" shapes in Avast color palette
+  (teal, red, yellow) converging on a white cloud in the centre.
+  Each teardrop has a pointed tail (far from cloud) and a wide rounded head
+  (near the cloud), like motion streaks flying into the sync point.
 
-  Design: two thick tube-style sync arcs that form a circular refresh symbol,
+  Safe zone: 18-90dp band. Cloud centred at (54, 55).
-  inspired by the braided knot icon's color palette:
-    Arc 1 (left side, CW): coral #E8665A -> orange #E8A040
-    Arc 2 (right side, CW): steel blue #4A7FD4 -> purple #7B5EA7
-  Each arc has a thin inner highlight to give a 3D glossy tube look.
-
-  Geometry: circle centred at (54,54), radius 27.
-    Arc 1: 100 deg to 260 deg CW (160 deg, through west/left)
-      start (49.31, 80.59)  end (49.31, 27.41)
-    Arc 2: 280 deg to  80 deg CW (160 deg, through east/right)
-      start (58.69, 27.41)  end (58.69, 80.59)
-  20-degree gaps at top (~260-280) and bottom (~80-100).
-
-  Highlights at r=23 (inner edge):
-    Arc 1 highlight: (49.99, 76.64) to (49.99, 31.36)
-    Arc 2 highlight: (58.01, 31.36) to (58.01, 76.64)
 -->
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:aapt="http://schemas.android.com/aapt"
@@ -26,74 +15,88 @@
     android:viewportWidth="108"
     android:viewportHeight="108">
 
-    <!-- Arc 1 shadow (offset slightly down-right for depth) -->
+    <!-- SHADOW layer under teardrops for depth -->
     <path
-        android:pathData="M 50.31,82.59 A 27,27 0 0,1 50.31,29.41"
+        android:pathData="M 54,28 C 42,28 30,36 32,50 C 22,55 22,70 34,72 L 74,72 C 84,72 88,62 82,55 C 86,43 76,33 66,35 C 62,30 58,28 54,28 Z"
-        android:fillColor="#00000000"
+        android:fillColor="#000000"
-        android:strokeWidth="9"
+        android:fillAlpha="0.20"
-        android:strokeLineCap="round"
+        android:translateY="2.5"/>
-        android:strokeColor="#44000000"/>
 
-    <!-- Arc 2 shadow -->
+    <!-- TEAL teardrop: enters from upper-left, tail at (22,22), head near cloud top-left -->
+    <!-- Teardrop shape: pointed at tail, fat elliptical head, rotated ~45 deg into centre -->
     <path
-        android:pathData="M 59.69,29.41 A 27,27 0 0,1 59.69,82.59"
+        android:pathData="M 35.5,26.5
-        android:fillColor="#00000000"
+                          C 30,21 22,22 22,22
-        android:strokeWidth="9"
+                          C 22,22 27,30 32.5,35.5
-        android:strokeLineCap="round"
+                          C 36,38 40,40 43,42
-        android:strokeColor="#44000000"/>
+                          C 40,39 36,32 35.5,26.5 Z">
-
+        <aapt:attr name="android:fillColor">
-    <!-- Arc 1: left side, coral to orange -->
-    <path
-        android:pathData="M 49.31,80.59 A 27,27 0 0,1 49.31,27.41"
-        android:fillColor="#00000000"
-        android:strokeWidth="9"
-        android:strokeLineCap="round">
-        <aapt:attr name="android:strokeColor">
             <gradient android:type="linear"
-                android:startX="49.31" android:startY="80.59"
+                android:startX="22" android:startY="22"
-                android:endX="49.31" android:endY="27.41"
+                android:endX="43" android:endY="42"
-                android:startColor="#E8665A"
+                android:startColor="#00BFA5"
-                android:endColor="#E8A040"/>
+                android:endColor="#26D6C0"/>
         </aapt:attr>
     </path>
 
-    <!-- Arc 2: right side, blue to purple -->
+    <!-- RED teardrop: enters from upper-right, tail at (86,22), head near cloud top-right -->
     <path
-        android:pathData="M 58.69,27.41 A 27,27 0 0,1 58.69,80.59"
+        android:pathData="M 72.5,26.5
-        android:fillColor="#00000000"
+                          C 78,21 86,22 86,22
-        android:strokeWidth="9"
+                          C 86,22 81,30 75.5,35.5
-        android:strokeLineCap="round">
+                          C 72,38 68,40 65,42
-        <aapt:attr name="android:strokeColor">
+                          C 68,39 72,32 72.5,26.5 Z">
+        <aapt:attr name="android:fillColor">
             <gradient android:type="linear"
-                android:startX="58.69" android:startY="27.41"
+                android:startX="86" android:startY="22"
-                android:endX="58.69" android:endY="80.59"
+                android:endX="65" android:endY="42"
-                android:startColor="#4A7FD4"
+                android:startColor="#E53935"
-                android:endColor="#7B5EA7"/>
+                android:endColor="#EF6558"/>
         </aapt:attr>
     </path>
 
-    <!-- Arc 1 inner highlight (glossy tube sheen) -->
+    <!-- YELLOW teardrop: enters from bottom-centre, tail at (54,88), head near cloud base -->
     <path
-        android:pathData="M 49.99,76.64 A 23,23 0 0,1 49.99,31.36"
+        android:pathData="M 48,75
-        android:fillColor="#00000000"
+                          C 45,82 47,88 54,88
-        android:strokeWidth="2.5"
+                          C 61,88 63,82 60,75
-        android:strokeLineCap="round"
+                          C 58,71 56,68 54,66
-        android:strokeColor="#55FFC8B0"/>
+                          C 52,68 50,71 48,75 Z">
+        <aapt:attr name="android:fillColor">
+            <gradient android:type="linear"
+                android:startX="54" android:startY="88"
+                android:endX="54" android:endY="66"
+                android:startColor="#F9A825"
+                android:endColor="#FFD740"/>
+        </aapt:attr>
+    </path>
 
-    <!-- Arc 2 inner highlight -->
+    <!-- CLOUD body (white, centred at 54,50) -->
     <path
-        android:pathData="M 58.01,31.36 A 23,23 0 0,1 58.01,76.64"
+        android:pathData="
+          M 36,62
+          A 9,9 0 0,1 36,44
+          A 9,9 0 0,1 45,36
+          A 12,12 0 0,1 66,37
+          A 8,8 0 0,1 74,48
+          A 8,8 0 0,1 68,62
+          Z"
+        android:fillColor="#FFFFFF"/>
+
+    <!-- Teal highlight on cloud top-left edge -->
+    <path
+        android:pathData="M 36,53 A 9,9 0 0,1 41,38"
         android:fillColor="#00000000"
-        android:strokeWidth="2.5"
+        android:strokeWidth="2"
         android:strokeLineCap="round"
-        android:strokeColor="#55B0C8FF"/>
+        android:strokeColor="#4000BFA5"/>
 
-    <!-- Arrowhead at end of Arc 1 (260 deg, top-left area, pointing right-up) -->
+    <!-- Red highlight on cloud top-right edge -->
-    <path android:pathData="M 42.13,32.74 L 49.31,27.41 L 40.73,24.86 Z"
+    <path
-        android:fillColor="#E8A040"/>
+        android:pathData="M 63,37 A 8,8 0 0,1 73,48"
-
+        android:fillColor="#00000000"
-    <!-- Arrowhead at end of Arc 2 (80 deg, bottom-right area, pointing left-down) -->
+        android:strokeWidth="2"
-    <path android:pathData="M 67.27,83.14 L 58.69,80.59 L 65.87,75.26 Z"
+        android:strokeLineCap="round"
-        android:fillColor="#7B5EA7"/>
+        android:strokeColor="#40E53935"/>
 
 </vector>

version.properties

@@ -1,2 +1,2 @@
-VERSION_NAME=1.0.27
+VERSION_NAME=1.0.28
-VERSION_CODE=28
+VERSION_CODE=29