Switch hand ranges to Poker Skill's 6-max charts with 3bet/call frames

- Replace the Yokosawa ranges with the 6-max opening ranges (UTG, HJ, CO,
  SB, BTN). Colors keep the old order: navy (strong UTG), red UTG, yellow
  HJ, green CO, blue SB, white BTN. SB is narrower than BTN, so blue sits
  one tier above white; the purple-frame category is gone.
- Show the "BTN vs CO open" chart on the range page as frames: light blue
  for 3bet, yellow for call.
- Grade BTN facing an unlimped CO open by those frames in reviews; other
  spots keep the color-tier rule (BB defends down to green).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

server/review/analyze.js

@@ -11,7 +11,7 @@ const { codes, rangeOf, narrow, rangeEquity, showdownShare } = require('./equity
 
 const STREETS = ['PREFLOP', 'FLOP', 'TURN', 'RIVER'];
 // レビューで色に添える説明（クイズ用の分類名がそのままでは分かりにくいもの）
-const COLOR_LABEL = { purple: '1人（SBのみ）', gray: 'レンジ外' };
+const COLOR_LABEL = { gray: 'レンジ外' };
 
 // 失った期待値がポット（コール後）のこの割合までは誤差として満点にする
 const TOLERANCE = 0.03;