Feature improvements
Improved view for exam slots - Include a persistent slot selections across weeks and views, better visibility for booking options, and improved management of one-off slots.

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Improved management of supervisors - improved issue where supervisors without active roles were still visible in the available supervisor list. This ensures that only active supervisors are displayed.

Bug Fixes
- Fixed an issue where students could be allocated to the same seat if moved between rooms. Now, already allocated students will be excluded from new allocations, and a message will notify if a student is already allocated
- Corrected the number of allocated students displayed in simple mode. The allocated number now correctly reflects the actual allocations.
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