fix: JSX structure in credit.tsx

- Fix nested tag structure: AI Credits tab was incorrectly nested inside Platform Ledger section
- Close Platform Ledger section before starting AI Credits tab
- Move AI Credits tab to be a sibling of Platform Ledger tab, not a child
- Wrap AI Credits content in proper section element for consistent styling

Fixes build errors in admin-solid

src/routes/admin/credit.tsx

@@ -923,10 +923,10 @@ export default function CreditPage() {
                 </div>
               </Show>
             </div>
-          </Show>
           </section>
         </Show>
       </div>
+    </Show>
   );
 }