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/apps/dashboard/static/apps/dashboard/game-kit.js

@@ -60,7 +60,7 @@
 
     function attachTooltip(el) {
         el.addEventListener('mouseenter', function () {
-            var tooltip = el.querySelector('.token-tooltip');
+            var tooltip = el.querySelector('.tt');
             if (!tooltip) return;
             var rect = el.getBoundingClientRect();
             tooltip.style.position = 'fixed';
@@ -69,7 +69,7 @@
             tooltip.style.display = 'block';
         });
         el.addEventListener('mouseleave', function () {
-            var tooltip = el.querySelector('.token-tooltip');
+            var tooltip = el.querySelector('.tt');
             if (tooltip) tooltip.style.display = '';
         });
     }