feat: remove Supabase, bundle questions locally, use JSON DB + API

fix: leaderboard tracking, score bugs, mobile admin, OG image

feat: make multiplayer matchmaking snappy and engaging

fix: persist ELO ratings and games_played to database

feat: add Spark Micro-Debate Arena

fix(cosmetics): wire all four cosmetic categories to their visible elements

fix(multiplayer): submit leaderboard entry on match completion

fix(challenge-me): prevent medium phase skip due to race condition in transition

UX: decrease question transition delays across all modes for faster, snappier gameplay

UX: smooth game start transitions by adding "3, 2, 1, Go" countdown states to Solo and Game Night modes

fix: prevent challenge-me mode from hanging on infinite spinner at end of game

Fix Quick Match multiplayer sync and solo scoring feedback

Fix Challenge Me 3-round system + improve Nebula Arcade drawer

feat: add room-based multiplayer, Game Night, and 124 new questions

feat: redesign landing page with floating tiles, hero pillars, scoring transparency

feat: wire game results to Supabase with async question loading

feat: enhance answer feedback with green/red glow, icons, and floating text

feat: upgrade all pages with Lucide icons, glow effects, and confetti

feat: polish — page transitions, sound integration, screen shake, remaining files

feat: multiplayer — matchmaking, 1v1 match with bot demo, match results with ELO

feat: results screen, leaderboard page, procedural sound system

feat: Challenge Me phase transitions + Streak progressive difficulty

feat: game UI components + Quick Fire gameplay with timer, scoring, and results