- Added endpoints to link and unlink customers to vendors, including validation for relationship types.
- Implemented a UI for managing linked customers in the vendor detail view.
- Introduced a search feature for customers when linking to vendors.
- Updated database schema to support customer-vendor relationships with necessary constraints and indices.
- Added migration scripts for new tables and fields related to supplier invoices and customer-vendor links.
- Modified bottom bar visibility in the frontend for improved user experience.
- Implemented a new bottom bar feature in `bottom-bar.js` that fetches and displays various notifications and statuses in real-time.
- Added functions for handling visibility, state updates, and user interactions within the bottom bar.
- Introduced WebSocket connection for real-time updates and fallback polling mechanism.
- Created a manual testing script `test_manual.py` to validate API endpoints for the manual module.
- Included tests for various paths to ensure expected responses from the server.
