update_log_5.0.12.md

# WorkersPanel 5.0.12

- Reworked the shift clock page into a responsive, card-based layout.
- Restored the merged clock workflow into the database version:
  - drivers must complete start-of-shift van/partner/registration/odometer details and upload 5 start photos;
  - drivers must complete end-of-shift checks, odometer and upload 6 end photos;
  - porters now complete start and end confirmation checks instead of a plain one-click clock.
- Extended clock records and exports to show van, partner, odometer, start/end checks and phase-specific photos.
- Added migration support for the new clock columns and permissions.