Fix Tailwind CSS v4 migration

- Update globals.css to use @import "tailwindcss" and @config
- Remove incompatible plugins (tailwindcss-animate, @tailwindcss/forms)
- Add @tailwindcss/postcss for v4 compatibility

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

tailwind.config.js

@@ -72,10 +72,5 @@ module.exports = {
       },
     },
   },
-  plugins: [
-    require("tailwindcss-animate"),
-    require("@tailwindcss/forms")({
-      strategy: "class",
-    }),
-  ],
+  plugins: [],
 }