Fix sidebar-claude tsconfig paths: point '@/*' at src

The bundler does honor tsconfig 'paths' (via resolve.tsConfig in
plugin-js-frameworks), but the mapping '@/*' -> './*' pointed at
the project root, not src/. So '@/lib/utils' resolved to
sidebar-claude/lib/utils (non-existent) instead of src/lib/utils.

Restore the '@/lib/utils' import now that the mapping is correct.

Author: cezaraugusto

examples/sidebar-claude/src/components/ui/button.tsx

@@ -2,7 +2,7 @@ import * as React from 'react'
 import {Slot} from '@radix-ui/react-slot'
 import {cva, type VariantProps} from 'class-variance-authority'
 
-import {cn} from '../../lib/utils'
+import {cn} from '@/lib/utils'
 
 const buttonVariants = cva(
   "inline-flex items-center justify-center gap-2 whitespace-nowrap rounded-md text-sm font-medium transition-all disabled:pointer-events-none disabled:opacity-50 [&_svg]:pointer-events-none [&_svg:not([class*='size-'])]:size-4 shrink-0 [&_svg]:shrink-0 outline-none focus-visible:border-ring focus-visible:ring-ring/50 focus-visible:ring-[3px] aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive",

examples/sidebar-claude/tsconfig.json

@@ -16,7 +16,7 @@
     "skipLibCheck": true,
     "baseUrl": ".",
     "paths": {
-      "@/*": ["./*"]
+      "@/*": ["./src/*"]
     },
     "verbatimModuleSyntax": false
   },