fix: resolve all DaisyUI audit issues
- settings.js: replace broken CSS vars with getThemeColor() helper
- base.html: add bg-primary text-primary-content active state to drawer
- All templates: btn-small -> btn-sm (DaisyUI standard)
- Delete orphan templates/components/header.html
- auth-utils.js: fix .show class -> use hidden (Tailwind)
- login.html: remove redundant auth-* classes, keep DaisyUI only
- auth-ui.js: update form selector for cleanup
- watchlist.html: fix nav active class styling
- 4 JS files (series-search, tabs, recommendations, anime-details):
- Replace all old CSS classes with DaisyUI/Tailwind
- Remove hardcoded colors, use theme-aware classes
- loading-spinner -> DaisyUI loading component
- no-results/search-results -> Tailwind utility layout
- All badges -> DaisyUI badge variants
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