better task complete animation

app.py

@@ -95,14 +95,12 @@ def sync_check():
     
     entry_id = str(current_entry['_id']) if current_entry else 'none'
     
-    # Create simple hash of tasks (IDs joined string)
-    # If a task is completed, it drops from this list -> hash changes -> client reloads
+    # Return list of IDs for smart diffing on frontend
     task_ids = sorted([str(t['_id']) for t in active_tasks])
-    tasks_hash = ','.join(task_ids)
     
     return jsonify({
         'entry_hash': entry_id,
-        'tasks_hash': tasks_hash
+        'task_ids': task_ids
     })
 
 @app.route('/register', methods=['GET', 'POST'])