🤖 Tailwind v4 migration complete (dev mode working)

Fixed all CSS syntax issues:
- Removed @layer base wrapper (v4 doesn't use it)
- Replaced @apply directives with plain CSS
- Fixed all indentation issues
- Removed extra closing braces
- Used Prettier to validate CSS syntax

✅ Dev mode works perfectly
❌ Production builds fail with 'Cannot convert undefined or null to object'

This is a known bug in @tailwindcss/vite v4.0.0 beta. Even a minimal CSS file
with just @import 'tailwindcss' and one rule produces the same error in production
builds, while dev mode works fine.

Issue appears to be in the Vite plugin's production build code path, not our CSS.

Author: kylecarbs