feat(frontend): detect HF Space cold start and auto-retry once awake

feat(confidence): match exacto de carta = alta confianza

refactor(frontend): lint sin errores y React doctor (Capa 3)

feat(frontend): light/dark theme toggle con tokens de marca

fix(frontend): envia card_mentions al backend para lookup directo de cartas

feat(frontend): render rb_* symbol icons, keyword tooltips, tolerant card detection

fix(cards): collapse cosmetic card variants by shared artwork

feat(cards): add slug/prefix lookup, card search, and multi-word detection

feat(frontend): add lookupCard helper backed by the static card index

feat(cards): emit frontend lookup index from parse_cards.py

feat(ui): add keyword badges with skewed style in answer display

feat(ui): add @mention dropdown for TCG keywords in query input

feat(llm): add multi-provider abstraction supporting Groq and OpenAI-compat

feat(hardening): frontend error states -- typed errors + ErrorDisplay component

feat: scaffold Next.js frontend with lib, store, and API proxy route