fix: correct JSX structure in EditCookbook.tsx

- Added missing closing div tags for form-section-content and form-section
- The Cover Image form-group was properly closed but the parent containers were not
- Resolves JSX parsing error at line 465/466

packages/web/src/pages/EditCookbook.tsx

@@ -320,6 +320,7 @@ function EditCookbook() {
             </div>
           </div>
         </div>
+          </div>
         </div>
 
         {/* SECTION 2: ORGANIZE THIS COOKBOOK */}