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

fix: cancel button actually cancels matchmaking

fix(spark): Batches 2 + 3 — atomic ELO, real DB IDs, polish

fix(spark): Batch 1 — practice ELO leak, schema alignment, RLS tightening

feat(spark): add custom match invite link with waiting screen and copy button

feat(spark): rewrite landing page with hero preview, CTAs, leaderboard, deferred spectrum

feat(spark): open matchmaking + persist practice debates to DB

feat(spark): practice mode awards half ELO

feat(spark): complete debate arena rework to conversational flow

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

fix: simplify topic selection — host picks, guest receives

fix: resolve multiplayer matchmaking race condition in Spark debates

feat: redesign Spark landing page with arena aesthetic

feat: add OG social images for Triviaverse, Spark, and Game Night

fix: AI opponent takes opposite side based on spectrum + judge anti-style bias

feat: add full debate transcript and expandable rounds to verdict

feat: allow users to suggest custom debate topics

fix: resolve all type errors from spectrum redesign

feat(spark): update debate room and components for spectrum redesign

feat(spark): update matchmaking lobby - spectrum slider, open matchmaking

feat(spark): critical reliability - disconnect detection, API error handling, judge timeout

fix: persist ELO ratings and games_played to database

feat: redesign judge to be qualitative instead of numeric categories

feat: add OG image and metadata for Spark Debate Arena

feat: add real-time feedback throughout the debate flow

fix: matchmaking race condition where opponent misses the match

feat: add Spark Micro-Debate Arena