fix: skip rendering img element when src is empty in image preview dialog

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/ui/image-preview-dialog.tsx

@@ -42,13 +42,15 @@ function ImagePreviewDialog({
           >
             <X className="h-5 w-5" />
           </button>
-          {/* eslint-disable-next-line @next/next/no-img-element */}
+          {src && (
+            /* eslint-disable-next-line @next/next/no-img-element */
             <img
               src={src}
               alt={alt}
               onClick={(e) => e.stopPropagation()}
               className="max-h-[90vh] max-w-[90vw] rounded-lg object-contain"
             />
+          )}
         </DialogPrimitive.Content>
       </DialogPrimitive.Portal>
     </DialogPrimitive.Root>