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Replace JS config with CSS-native @theme, @Utility, and @source directives. Remove postcss/autoprefixer dependencies in favor of @tailwindcss/cli. Convert cross-referenced base classes (focus-ring, btn, nav-item, toast) to @Utility so @apply works correctly in v4. Remove 12 unused component classes.
Main reverted tailwindcss to ^3.4.0 with postcss/autoprefixer — resolve in favor of our v4 migration (@tailwindcss/cli + tailwindcss ^4.0.0). Regenerate package-lock.json.
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Summary
@tailwinddirectives with@import "tailwindcss"and@sourcefor content detectiontailwind.config.jsto@theme { ... }CSS custom propertiesfocus-ring,btn,nav-item,toast) to@utilityso@applyworks in v4tailwindcss+postcss+autoprefixerto@tailwindcss/clitailwind.config.jsandpostcss.config.js(no longer needed)btn-primary,btn-danger,badge-*,card-hover,file-item-selected,input-error,truncate-2)Test plan
npm run build:csssucceeds with no errors (Tailwind v4.2.1)output.csscontains custom color utilities (bg-cloud-600,text-cloud-700)output.csscontains component classes (.btn-ghost,.toast-success,.modal-backdrop)dotnet buildsucceeds (0 errors)