Migrate 4 web apps from @tailwindcss/postcss to @tailwindcss/vite:
- chat
- manadeck
- manacore
- presi
Changes per app:
- Replace @tailwindcss/postcss with @tailwindcss/vite in package.json
- Add tailwindcss() to vite.config.ts plugins array
- Delete postcss.config.js (no longer needed)
Benefits:
- Faster builds with native Vite integration
- Consistent build pipeline across all 14 web apps
- Simplified configuration (no separate PostCSS config)
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