Jaume Garriga Maestre 288a000953 feat: enhanced stats — streak, hard comarques, evolution, group comparison, per-question tracking ...

- BD: ADD COLUMN filter_group on sessions; CREATE TABLE session_answers (per-question detail)
- server.js: POST /api/sessions accepts filter_group + answers array; GET stats returns
  totalSeconds, currentStreak, avgPct+evolution per level (1-8), hardComarques, groupStats
- index.html: sessionAnswers[] tracking in L2/L4/L5/L6/L7/L8; saveSession sends new fields;
  loadStats rewritten with streak badge, 4-box stats grid, sparklines on level bars,
  hard comarques section and group performance section

2026-05-15 09:06:41 +02:00

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