1. Renamed "تقييم اللاعبين" to "تصنيف وتعيين اللاعبين" throughout
   (sidebar, page titles, buttons) — better describes the actual action
   of classifying players into groups.

2. Assessment page now shows discipline tabs — clicking a discipline
   filters groups to only show those belonging to that activity.
   Player's selected disciplines are already visible at top.

3. Fixed medical certificate bug: when approving via the player profile
   edit form (updateMedical), the document's approval_status was not
   being synced. Now setting player to fit/conditional also marks the
   latest document as approved, and unfit marks it as rejected.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>