Improve 3D gallery and debug checkup workflow for image curation.

Add parquet floor, museum-style exit, movement-tinted walls, and gold/black
frames with gallery sync after Fix it. Debug panel gets Checked and Fix it
buttons; documentation and image-fetch reliability updates included.

Co-authored-by: Cursor <cursoragent@cursor.com>

client/src/pages/CheckupPage.tsx

@@ -130,7 +130,10 @@ function SearchPreviewCell({
   return (
     <div className="checkup-thumb checkup-thumb-search" title={result.query}>
       <img
-        src={debugImageProxyUrl(result.imageUrl)}
+        src={debugImageProxyUrl(result.imageUrl, {
+          searchUrl: result.searchUrl,
+          source: result.source,
+        })}
         alt={`Search: ${result.query}`}
         loading="lazy"
         decoding="async"
@@ -337,7 +340,11 @@ export default function CheckupPage({ onBack, onOpenPainting }: Props) {
       });
 
       try {
-        const updated = await api.fixPaintingImage(row.id, searchState.result.imageUrl);
+        const updated = await api.fixPaintingImage(row.id, searchState.result.imageUrl, {
+          searchUrl: searchState.result.searchUrl,
+          source: searchState.result.source,
+          thumbUrl: searchState.result.thumbUrl,
+        });
         setImageVersionById((prev) => ({ ...prev, [row.id]: (prev[row.id] ?? 0) + 1 }));
         setRows((list) =>
           list.map((r) =>