Tailwind CSS v3 to v4 Migration

The path. Audit first, automate second, verify third. Skipping the audit produces a build that compiles and renders wrong.

Companion skills :

• tailwind-core-v3-vs-v4 : decision tree for staying vs upgrading
• tailwind-errors-v4-migration : trap catalogue after upgrade
• tailwind-impl-config-v4 : v4 CSS-first config surface
• tailwind-impl-config-v3 : v3 JS config surface (source state)

Decision : Do You Even Migrate