Introduced a useragent_helper with a function to generate a compliant User-Agent string for Cloudlog, and updated QRZ API calls in Qrz controller and Logbook_model to use this helper. This ensures consistent and QRZ-compliant User-Agent headers for all outgoing requests.
Added a check and error log for missing station_callsign during QRZ import. This helps identify records with incomplete data and prevents potential issues when processing QSOs.
Simplifies the QRZ data download process by removing the custom date selection logic. Now, all QRZ data is downloaded regardless of the date specified in the request.
Improves performance of QRZ QSO upload by batching database updates in the controller and model, reducing the number of individual update queries. Adds a new migration to create indexes supporting QRZ upload/download operations. Refactors QRZ download batch processing to use temporary tables and efficient JOINs for large batch updates, further enhancing speed and scalability.
This commit has some further changes to text throughout the application. There are also some small fixes for text formatting. E.g. making sure that the small "helper" text under certain form fields is all consistent in terms of colour, font, etc.
