fix(default-app): Change 'Patterns' header to 'Pages' (commontoolsinc#2042)

Update the header label in the default app charm list from "Patterns" to
"Pages" to better reflect the purpose of the listed items.

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

Co-authored-by: Tony Espinoza <[email protected]>
Co-authored-by: Claude <[email protected]>

Author: 3 people

packages/patterns/default-app.tsx

@@ -177,7 +177,7 @@ export default recipe<CharmsListInput, CharmsListOutput>(
                 }
               `}
               </style>
-              <h2>Patterns</h2>
+              <h2>Pages</h2>
 
               <ct-table full-width hover>
                 <tbody>