fix(tailwind): align PostCSS config with Tailwind v4 docs
Root cause: Vercel wasn't processing Tailwind through @tailwindcss/postcss, serving raw CSS with zero utility classes (23KB theme-only vs 53KB with utilities). The source() directive was output literally as @media source(). Fixes per official Tailwind v4 + Next.js setup: - Switch postcss.config.js (CJS) → postcss.config.mjs (ESM) - Remove autoprefixer (built into Tailwind v4) - Use plain @import "tailwindcss" (auto source detection) - Move tailwindcss + @tailwindcss/postcss to dependencies
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next/postcss.config.mjs
0 → 100644
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