tooltips app TDD spike + kit bag refactor to .tt

- New apps.tooltips: TooltipContent model, {% tooltip data %} inclusion
  tag, _tooltip.html partial with .tt/.tt-title/.tt-description etc.
  class contract; 34 tests green
- Kit bag panel (_kit_bag_panel.html): .token-tooltip → .tt + child
  class renames (tt-title, tt-description, tt-shoptalk, tt-expiry)
- game-kit.js attachTooltip: .token-tooltip → .tt selector
- SCSS: .tt added alongside .token-tooltip for display:none default +
  hover rules in _wallet-tokens.scss and _game-kit.scss

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/static_src/scss/_game-kit.scss

@@ -105,10 +105,12 @@
         transition: filter 0.15s;
         padding: 0 0.125rem;
 
-        &:hover .token-tooltip { display: none; } // JS positions these as fixed
+        &:hover .token-tooltip,
+        &:hover .tt { display: none; } // JS positions these as fixed
     }
 
-    .token-tooltip {
+    .token-tooltip,
+    .tt {
         z-index: 9999;
     }
 

src/static_src/scss/_wallet-tokens.scss

@@ -1,4 +1,5 @@
-.token-tooltip {
+.token-tooltip,
+.tt {
     display: none;
     width: 16rem;
     max-width: 16rem;
@@ -66,7 +67,8 @@
         transform: translateX(-50%);
     }
 
-    &:hover .token-tooltip {
+    &:hover .token-tooltip,
+    &:hover .tt {
         display: block;
     }
 }