- Upgraded tailwindcss v3 → v4.2.1, postcss plugin to @tailwindcss/postcss - Deleted tailwind.config.js, migrated theme to CSS @theme block in index.css - Replaced @tailwind directives with @import 'tailwindcss' - Added @custom-variant dark, @utility blocks for custom utilities - Updated class names across 128 files (shadow-sm → shadow-xs, etc.) - Removed autoprefixer (built into v4) - Added migration plan doc Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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