upgrade Tailwind CSS to v4 #23
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✅ What changed
Upgraded Tailwind dependency to v4
Updated config syntax (CSS-first @theme), directives (@import "tailwindcss"), and PostCSS/Vite plugin setup
🎯 Why it matters
Faster builds and dev experience
Enables modern CSS features (variables, cascade, container queries), future‑proofing the UI
🧪 How it was tested
Ran npx @tailwindcss/upgrade
Confirmed styles on key pages
Build/dev pipelines (npm run dev/build) succeed without errors
✅ Checklist:
[x] Ran upgrade tool
[x] Style sanity‑checked
[x] Verified clean builds