fix: resolve JSX parsing error with emoji in guide page

Changed guide page emoji from 📚 to 📖 to resolve syntax error that was
preventing the dev server from compiling. The original emoji was causing
JSX parser issues with 'Unexpected token PageWithNav' error.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

apps/web/src/app/guide/page.tsx

@@ -17,7 +17,7 @@ type TabType = 'reading' | 'arithmetic'
 export default function GuidePage() {
   const [activeTab, setActiveTab] = useState<TabType>('reading')
   return (
-    <PageWithNav navTitle="Interactive Guide" navEmoji="📚">
+    <PageWithNav navTitle="Interactive Guide" navEmoji="📖">
       <div className={css({ minHeight: '100vh', bg: 'gray.50' })}>
 
       {/* Hero Section */}