Phase 5: queue 60s timeout with retry prompt, match history accepts game_key,
spectate routes to correct game scene, shop shows "owned" indicator, profile
shows dash instead of 1200 for unrated players.

Phase 6: remove duplicate disconnectWatch calls (use match-session only),
fix auth.php double token verification with requireAuthUser(), cascade
delete related data on account deletion.

Phase 1: fix opponentRating using actual rating in live mode instead of
botElos lookup.

Fix achievements recursive mount — update in-place instead of re-calling
mountAchievements.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>