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/core/settings.py

@@ -63,6 +63,7 @@ INSTALLED_APPS = [
     'apps.epic',
     'apps.drama',
     # Custom apps
+    'apps.tooltips',
     'apps.ap',
     'apps.api',
     'apps.applets',