Update UI to use Tailwind CSS with dark theme
- Replace custom CSS with Tailwind CSS via CDN - Consistent dark theme across all pages - Responsive layouts with mobile-friendly breakpoints - Updated: home, login/register, runs list, cache list, run detail, cache detail - Modern card-based UI with hover states and status badges 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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