Time Controls:
- 4 categories: Bullet (1+0, 1+1, 2+1), Blitz (3+0, 3+2, 5+0, 5+3),
  Rapid (10+0, 10+5, 15+10, 20+0), Classical (30+0, 30+20, 45+0, 60+0)
- Category tabs with dynamic option switching
- Both multiplayer and custom game sections

ELO:
- Default starts at 0 (was 1200)
- DB columns altered: DEFAULT 0
- Floor at 0 (was 100)
- FIDE calculation unchanged (K-factor based on games played)

Bot games:
- Always rated=false (removed toggle)
- Shows "مباراة تدريبية (غير مصنفة)" instead of rated toggle
- Quick match also unrated

Premove:
- Selected square now visually highlighted during opponent's turn
- premove-from class applied immediately for visual feedback
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>