Features:
- SpaceLayoutManager: full CRUD for facility layouts (grid/lanes/zones/custom)
  with visual segment preview and toggle availability
- SpaceAssignmentWizard: 5-step wizard for assigning groups to facility segments
  Step 1: Search and select training group
  Step 2: Choose which schedule slot to assign
  Step 3: Pick the facility (if not already linked)
  Step 4: Visual grid/lane/zone selector with real-time collision detection
  Step 5: Success confirmation
- Visual grid renders as clickable cells showing available/selected/occupied/disabled states
- Real-time collision checking against existing confirmed reservations
- Saves space_reservation_template on TrainingSchedule for auto-reservation on session creation
- Fix: ReservationService.autoReserveForSession() now uses correct field names
  (space_reservation_template instead of segments, segment_ids instead of segments key)
- Added "التخطيط" action link in facility list table
- Added "تعيين المساحات" to sidebar navigation
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>