UI polish: opponent draw flash, compact house rules with suit separators, toast styling.

- Opponent draw highlight: scale + outline flash animation
- House rules reorganized: Gameplay, Jokers, Card Values, Bonuses & Penalties
- Compact inline rule descriptions with alternating suit separators (♣♦♠♥)
- Wolfpack + Four of a Kind combo note when both selected
- Toast notifications now yellow/green with charcoal text
- Brief pause after AI draw for visual feedback

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

server/ai.py

@@ -1073,7 +1073,9 @@ async def process_cpu_turn(
         return
 
     await broadcast_callback()
-    await asyncio.sleep(0.4 + random.uniform(0, 0.4))
+    # Brief pause after draw to let the flash animation register visually
+    await asyncio.sleep(0.08)
+    await asyncio.sleep(0.35 + random.uniform(0, 0.35))
 
     # Decide whether to swap or discard
     swap_pos = GolfAI.choose_swap_or_discard(drawn, cpu_player, profile, game)