TOOLTIPS: extract .tt base to _tooltips.scss + natus element/planet title colours

- New _tooltips.scss: .token-tooltip/.tt base block extracted from _wallet-tokens.scss
- core.scss: import order …billboard → tooltips → game-kit → wallet-tokens
- _natus.scss: .tt-title--au/ag/…/pu (--six* dark, --pri* light) + .tt-title--el-* for element ring (--pri* dark, --ter* light) via body[class*="-light"] selector
- natus-wheel.js: element tooltip title switched from inline style to .tt-title--el-{key} CSS class; PLANET_ELEMENTS map drives .tt-title--{el} class on planet titles
- _game-kit.scss: kit bag .tt child font-size rules added (1rem title, 0.75rem desc/shoptalk/expiry)
- CLAUDE.md: SCSS import order updated

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

src/static_src/scss/core.scss

@@ -10,6 +10,7 @@
 @import 'natus';
 @import 'tray';
 @import 'billboard';
+@import 'tooltips';
 @import 'game-kit';
 @import 'wallet-tokens';