- Updated the WebSocket hub to replace the insecure `user_id` query parameter with an authentication token for secure connections.
- Introduced typed events for mail operations (created, updated, deleted) to streamline event handling.
- Implemented heartbeat functionality (ping/pong) to maintain connection health.
- Enhanced client reconnection logic and delta replay for improved user experience.
- Added limits on connections per user/session to prevent abuse and ensure stability.
- Introduced a new sync pipeline for IMAP that integrates a rules engine and webhook execution.
- Enhanced the `SyncWorker` to support attachment management and folder synchronization.
- Added functionality to detect special folder types (Sent, Drafts, Trash, Archive, Spam) during sync.
- Implemented a database schema for tracking rule executions and their outcomes.
- Created unit tests for the new rules engine and webhook execution logic.
- Updated migration scripts to accommodate new database structures for rule executions and folder states.
- Enhanced error handling and logging throughout the sync process for better observability.
