Optimize: Skip color photo processing when not uploading new photos

- Check if any color photos are being uploaded before processing
- Only parse/merge color photos if new files exist
- Reduces form submission time from 25+ seconds to ~6 seconds (75% improvement)
- Particularly beneficial for products with many colors (16+ colors)
- Tested: Classic T Shirt save now completes in 6.1 seconds vs 25+ seconds

.claude/settings.local.json

@@ -103,7 +103,8 @@
       "Bash(git commit -m 'Feature: Add file removal and print area edit toggles to photo upload *)",
       "Bash(git commit -m 'Fix: Show Remove and Modify print area buttons for existing images *)",
       "Bash(git commit -m 'Fix: Handle image removal in product editor *)",
-      "Bash(git commit -m 'Refactor: Move image display into PhotoPrintAreaField component *)"
+      "Bash(git commit -m 'Refactor: Move image display into PhotoPrintAreaField component *)",
+      "Bash(git commit -m 'Optimize: Skip color photo processing when not uploading new photos *)"
     ]
   }
 }