- Replace Magra with Geist Mono font
- Rename font variables to geistSans/geistMono
- Apply both font variables to body
- Redesign sticky header with glass-strong and CalendarDays icon
- Wrap main content in max-w-4xl centered container
- Add glass-strong className to Toaster
- Default theme changed to dark
Sort imports alphabetically, convert value imports to type-only where
appropriate, normalize indentation to tabs, and sort exports
alphabetically across UI components, pages, and lib modules.