fix(storybook): wire Tailwind v4 theme into Storybook preview

- Split globals.css into globals.css + theme.css so Storybook can
  import design tokens without the @import "tailwindcss" directive
  that breaks Vite's preview module loading
- Prepend @tailwindcss/vite plugin for correct processing order
- Add @source to scan core-ui components for utility class generation

apps/storybook/tsconfig.json

@@ -5,6 +5,12 @@
       "@/*": ["./src/*"]
     }
   },
-  "include": ["src/**/*.ts", "src/**/*.tsx", "*.ts", "*.tsx"],
+  "include": [
+    "src/**/*.ts",
+    "src/**/*.tsx",
+    ".storybook/**/*.ts",
+    "*.ts",
+    "*.tsx"
+  ],
   "exclude": ["node_modules"]
 }