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>

admin/range.css

@@ -25,7 +25,12 @@
 .cat-green { --c: #4e8051; --fg: #101910; }
 .cat-blue { --c: #6aa5c9; --fg: #14191f; }
 .cat-white { --c: #f7f7f7; --fg: #222; }
-.cat-gray, .cat-purple { --c: #929292; --fg: #222; }
+.cat-gray { --c: #929292; --fg: #222; }
+
+/* レイズを受けたときの対応の枠（3bet は水色、コールは黄）。下地の色と紛れないよう内側に暗い線を添える */
+.facing-3bet { --frame: #3fd4ff; }
+.facing-call { --frame: #ffe23a; }
+.range-cell.facing-3bet, .range-cell.facing-call { box-shadow: inset 0 0 0 3px var(--frame), inset 0 0 0 4px rgba(0, 0, 0, 0.45); }
 
 /* 13×13 の表 */
 .range-matrix { display: grid; grid-template-columns: repeat(13, 1fr); gap: 2px; }
@@ -44,14 +49,13 @@
   cursor: pointer;
   position: relative;
 }
-.range-cell.cat-purple { box-shadow: inset 0 0 0 2px #c12cff; }
 .range-cell.selected { outline: 2px solid var(--gold); outline-offset: 1px; z-index: 1; }
 
 /* 凡例 */
 .range-legend { display: flex; flex-wrap: wrap; gap: 6px 12px; margin-top: 12px; font-size: 12px; color: var(--muted); }
 .range-legend span { display: inline-flex; align-items: center; gap: 6px; }
 .swatch-dot { width: 14px; height: 14px; border-radius: 4px; background: var(--c); flex: none; }
-.swatch-dot.cat-purple { box-shadow: inset 0 0 0 2px #c12cff; }
+.swatch-dot.swatch-frame { background: transparent; box-shadow: inset 0 0 0 3px var(--frame); }
 
 /* 選択したハンド */
 .sel-hand { font-size: 28px; font-weight: 900; line-height: 1.1; }