Migrate Tailwind CSS from v3.4 to v4.3 with updates and fixes#679
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Performs the full v3 -> v4 migration so the Dependabot bump (#597) is safe to ship; merging the version bump alone would have broken the build. - Run official @tailwindcss/upgrade codemod: @tailwind directives -> @import "tailwindcss", utility renames across 49 files (shadow/rounded scale, bg-gradient-to-* -> bg-linear-to-*, flex-grow/shrink -> grow/shrink, outline-none -> outline-hidden), and PostCSS swap to @tailwindcss/postcss (autoprefixer dropped, now bundled in v4). - Retain the existing theme via @config '../../tailwind.config.ts' in globals.css (lowest-risk path; preserves the hsl(var()) shadcn color map, beam keyframes/animations, boxShadow.glow, container, borderRadius). - Replace unmaintained tailwindcss-animate with tw-animate-css (v4-native, pure-CSS; same animate-in/fade/slide/zoom utilities). - Fix codemod false-positive: shadcn Button variant="outline" was wrongly rewritten to "outline-solid" in glossary/page.tsx. - Update docs (CLAUDE.md, README, AGENTS) to reflect v4 + remove the "do not upgrade to v4" rule. Verified: npm run ci (lint+typecheck+test+webpack build) passes; dev (Turbopack) renders light + dark correctly with themed colors, gradients, shadows, glow, and animations. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
feat: migrate Tailwind CSS v3.4 → v4.3 (implements #597)
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