v1.0.31: fix remaining sync loop triggers + icon redesign

Three additional fixes found via live device logs:

1. Startup race window: FileObserver fires immediately after
   startWatching() before catchupScan coroutine runs, starting a 5s
   debounce with cooldown=0. Fixed by setting a 15s startup cooldown
   in watchPath() BEFORE calling watchDirRecursive.

2. Stale debounce bypass: debounce job started with cooldown=0 fires
   5s later even after catchupScan has already set cooldown and started
   a catchup sync. Fixed by re-checking cooldown after the 5s delay
   and aborting if already active.

3. Debounce not cancelled by catchupScan: if a debounce was queued
   before catchupScan ran, catchupScan would enqueue a catchup sync
   AND the old debounce would fire 5s later enqueuing a second sync.
   Fixed by cancelling pending debounce in catchupScan before enqueue.

Icon: four thick arcs (blue/red/green/orange) in a 4-way pinwheel
with over/under ordering. White sync-arrow circle at center.
Pure black background.

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

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

@@ -6,71 +6,79 @@
     android:viewportHeight="108">
 
     <!--
-      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.
+      Four thick arcs arranged as an interlocked pinwheel.
+      Each arc sweeps ~210 degrees, rounded caps, radius 18 from center (54,54).
+      Draw order creates natural over/under at the four crossing points:
+        blue under green, green under red, red under orange, orange under blue (re-draw blue tip).
+
+      Arc endpoints computed at radius 18, sweep 210 deg clockwise:
+        start angle  end angle    start point    end point
+        270 (top)    120          (54, 36)        (45, 70)
+          0 (right)  210          (72, 54)        (39, 45)
+         90 (bot)    300          (54, 72)        (63, 38)
+        180 (left)   390=30       (36, 54)        (69, 63)
     -->
 
-    <!-- Blue ring - top-left -->
+    <!-- Blue — starts at top, sweeps clockwise to lower-left -->
     <path
         android:strokeColor="#2979FF"
-        android:strokeWidth="7"
+        android:strokeWidth="8.5"
         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"/>
+        android:pathData="M 54,36 A 18,18 0 1,1 45,70"/>
 
-    <!-- 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"/>
-
-    <!-- Green ring - bottom-left -->
+    <!-- Green — starts at bottom, sweeps clockwise to upper-right -->
     <path
         android:strokeColor="#00C853"
-        android:strokeWidth="7"
+        android:strokeWidth="8.5"
         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"/>
+        android:pathData="M 54,72 A 18,18 0 1,1 63,38"/>
 
-    <!-- Orange ring - bottom-right -->
+    <!-- Red — starts at right, sweeps clockwise to lower-left -->
+    <path
+        android:strokeColor="#E53935"
+        android:strokeWidth="8.5"
+        android:fillColor="#00000000"
+        android:strokeLineCap="round"
+        android:pathData="M 72,54 A 18,18 0 1,1 39,45"/>
+
+    <!-- Orange — starts at left, sweeps clockwise to upper-right -->
     <path
         android:strokeColor="#FF6D00"
-        android:strokeWidth="7"
+        android:strokeWidth="8.5"
         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"/>
+        android:pathData="M 36,54 A 18,18 0 1,1 69,63"/>
 
-    <!-- White filled circle at center to create interlock illusion -->
+    <!-- Re-draw blue start cap on top so it goes OVER orange end -->
+    <path
+        android:strokeColor="#2979FF"
+        android:strokeWidth="8.5"
+        android:fillColor="#00000000"
+        android:strokeLineCap="round"
+        android:pathData="M 54,36 A 18,18 0 0,1 62,37.5"/>
+
+    <!-- White sync circle at center -->
     <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"/>
+        android:pathData="M 45,54 A 9,9 0 1,0 63,54 A 9,9 0 1,0 45,54 Z"/>
 
-    <!-- Sync arrow ring (outer white circle) -->
+    <!-- Sync ring -->
     <path
         android:strokeColor="#FFFFFF"
-        android:strokeWidth="3.5"
+        android:strokeWidth="2.5"
         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"/>
+        android:pathData="M 46.5,54 A 7.5,7.5 0 1,0 61.5,54 A 7.5,7.5 0 1,0 46.5,54 Z"/>
 
-    <!-- Sync arrow head top -->
+    <!-- Top arrow head (pointing up) -->
     <path
         android:fillColor="#FFFFFF"
-        android:pathData="M 54,45 L 57,49 L 51,49 Z"/>
+        android:pathData="M 54,46.5 L 57,50.5 L 51,50.5 Z"/>
 
-    <!-- Sync arrow head bottom -->
+    <!-- Bottom arrow head (pointing down) -->
     <path
         android:fillColor="#FFFFFF"
-        android:pathData="M 54,59 L 51,55 L 57,55 Z"/>
+        android:pathData="M 54,61.5 L 51,57.5 L 57,57.5 Z"/>
 
 </vector>