Move uncertain modifier assignment step after items review

Changed wizard flow so uncertain modifiers are presented AFTER user
has reviewed all items, not before. This makes more sense because:
- User can see what items exist before deciding modifier assignments
- User understands their menu structure before making decisions
- More informed decisions about which categories need which modifiers

New flow:
1. Business info
2. Categories
3. Modifiers (select which to keep)
4. Items (review and select)
5. Uncertain modifiers (assign to categories) <- moved here
6. Final review and save

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

portal/setup-wizard.html

@@ -1481,8 +1481,8 @@
 
       config.extractedData.modifiers = updatedModifiers;
 
-      // Check if there are uncertain modifiers that need category assignment
+      // Go to items step (uncertain modifiers will be handled after items)
-      showUncertainModifiersStep();
+      showItemsStep();
     }
 
     // New step: Handle uncertain modifier assignments
@@ -1676,7 +1676,8 @@
         checkedIds.has(item.id || i.toString())
       );
 
-      showFinalStep();
+      // Now that user has seen items, ask about uncertain modifiers
+      showUncertainModifiersStep();
     }
 
     // Step 5: Final Review