SIG SELECT: FLIP→SPIN rename; stage-card reversal JS — TDD

- Template: FLIP btn label → SPIN; .btn-reverse class + .sig-flip-btn kept
- _button-pad.scss: .btn-reverse restyled w. cyan (--priCy/--terCy); .btn-tip
  removed; button section comments added (BIG, BYE, FYI, OK, SPIN etc.)
- sig-select.js: SPIN/FLIP handler also toggles .stage-card--reversed on
  stageCard; updateStage() populates .fan-card-reversal-name (data-reversal)
  + .fan-card-reversal-qualifier (polarity qualifier); resets .stage-card--reversed
  on each new hover — TDD
- SigSelectSpec.js: SPIN card animation describe block (7 specs); spec
  descriptions updated FLIP→SPIN; fixture gains reversal elements +
  data-reversal attr; 235 Jasmine specs green

Code architected by Disco DeDisco <discodedisco@outlook.com>
Git commit message Co-Authored-By:
Claude Sonnet 4.6 <noreply@anthropic.com>

src/templates/apps/gameboard/_partials/_sig_select_overlay.html

@@ -36,7 +36,7 @@ Context: sig_cards, user_polarity, user_seat, sig_reserve_url, sig_reservations_
                 </div>
             </div>
             <div class="sig-stat-block">
-                <button class="btn btn-reverse sig-flip-btn" type="button">FLIP</button>
+                <button class="btn btn-reverse sig-flip-btn" type="button">SPIN</button>
                 <button class="btn btn-caution sig-caution-btn" type="button">FYI</button>
                 <div class="stat-face stat-face--upright">
                     <p class="stat-face-label">Upright</p>