Remove list footer divider and reverse sync spinner

Remove the bottom divider from the lists/drawer footer and adjust the
sync icon animation to spin in the correct (reverse) direction when
syncing.

- Remove the border-t divider classes from the drawer footer to eliminate the
visual divider at the bottom of the lists panel.
- Replace the Tailwind animate-spin class with an inline CSS animation that
runs in reverse when app.syncing is true so the sync icon spins the
expected direction.

apps/tauri/src/lib/screens/TasksScreen.svelte

@@ -327,7 +327,7 @@
     </div>
 
     <!-- Drawer footer: sync status -->
-    <div class="shrink-0 border-t border-border-light px-4 py-2.5 dark:border-border-dark">
+    <div class="shrink-0 px-4 py-2.5">
       {#if app.isWebdav}
         <div class="flex items-center gap-2">
           <!-- Status dot -->
@@ -344,7 +344,7 @@
             class="rounded-lg p-1.5 hover:bg-black/5 disabled:opacity-30 dark:hover:bg-white/10"
             title="Sync now"
           >
-            <svg class="h-4 w-4 {app.syncing ? 'animate-spin' : ''}" viewBox="0 0 20 20" fill="currentColor">
+            <svg class="h-4 w-4" style={app.syncing ? 'animation: spin 1s linear infinite reverse' : ''} viewBox="0 0 20 20" fill="currentColor">
               <path fill-rule="evenodd" d="M4 2a1 1 0 011 1v2.101a7.002 7.002 0 0111.601 2.566 1 1 0 11-1.885.666A5.002 5.002 0 005.999 7H9a1 1 0 010 2H4a1 1 0 01-1-1V3a1 1 0 011-1zm.008 9.057a1 1 0 011.276.61A5.002 5.002 0 0014.001 13H11a1 1 0 110-2h5a1 1 0 011 1v5a1 1 0 11-2 0v-2.101a7.002 7.002 0 01-11.601-2.566 1 1 0 01.61-1.276z" clip-rule="evenodd" />
             </svg>
           </button>