Replace all DaisyUI component classes with pure Tailwind CSS utility
classes following TailwindUI conventions. Use dark: variants for dark
mode instead of DaisyUI's data-theme semantic color system.
- Remove DaisyUI plugin and theme vendor files
- Configure Tailwind v4 custom dark variant for data-theme attribute
- Migrate all components: cards, tables, badges, buttons, forms,
navigation, dropdowns, modals, alerts, star ratings, spinners
- Update all auth pages (login, register, settings, password reset,
confirmation) to TailwindUI card layout
- Update content pages (about, API docs, status, packets, bad packets,
info, weather) to TailwindUI patterns
- Replace opacity-based text styling with semantic gray colors
- Update test assertions to match new class names
