refactor: anonymous/free chat experience

- Enhanced lambda function formatting in `_after_commit` for better clarity.
- Simplified generator expression in `_match_condition` for improved readability.
- Streamlined function signature in `_eligible` for consistency.
- Updated imports and refactored anonymous chat routes to use a new agent creation method.
- Added a new function `_load_anon_document` to handle document loading from Redis.
- Improved UI components by replacing legacy structures with modern alternatives, including alerts and separators.
- Refactored quota-related components to utilize new alert structures for better user feedback.
- Cleaned up unused variables and optimized component states for performance.

surfsense_backend/app/session_events.py

@@ -79,9 +79,11 @@ def _after_commit(session: Session) -> None:
     ]
     for task in tasks:
         task.add_done_callback(
-            lambda t: logger.error("event publish failed: %s", t.exception())
-            if not t.cancelled() and t.exception()
-            else None
+            lambda t: (
+                logger.error("event publish failed: %s", t.exception())
+                if not t.cancelled() and t.exception()
+                else None
+            )
         )