Update test coverage timestamps and fix coroutine cleanup in task creation tests by properly closing coroutines in mocked asyncio.create_task calls

tests/backend/test_routes_tasks.py

@@ -549,7 +549,11 @@ class TestCreateTaskWithPlaybook:
         with patch("app.routes.tasks.ws_manager") as mock_ws, \
              patch("app.routes.tasks.asyncio.create_task") as mock_create_task:
             mock_ws.broadcast = AsyncMock()
-            mock_create_task.return_value = MagicMock()
+            def _create_task_and_close(coro):
+                coro.close()
+                return MagicMock()
+
+            mock_create_task.side_effect = _create_task_and_close
             
             response = await client.post(
                 "/api/tasks",
@@ -566,8 +570,14 @@ class TestCreateTaskWithPlaybook:
     @pytest.mark.asyncio
     async def test_create_task_default_target(self, client: AsyncClient, db_session):
         """Création de tâche avec target par défaut."""
-        with patch("app.routes.tasks.ws_manager") as mock_ws:
+        with patch("app.routes.tasks.ws_manager") as mock_ws, \
+             patch("app.routes.tasks.asyncio.create_task") as mock_create_task:
             mock_ws.broadcast = AsyncMock()
+            def _create_task_and_close(coro):
+                coro.close()
+                return MagicMock()
+
+            mock_create_task.side_effect = _create_task_and_close
             
             response = await client.post(
                 "/api/tasks",