fix: preserve primary image aspect ratio

.memory/worklog.json

@@ -1580,6 +1580,13 @@
       "message": "fix: improve project brief preview layout",
       "hash": "8d4275f",
       "files_changed": 3
+    },
+    {
+      "ts": "2026-05-20T17:11:41+08:00",
+      "type": "commit",
+      "message": "auto-save 2026-05-20 17:11 (~2)",
+      "hash": "36c93cd",
+      "files_changed": 2
     }
   ]
 }

src/app/page.tsx

@@ -92,6 +92,10 @@ function ProjectBrief({ session }: { session: GenSession }) {
   const [previewOpen, setPreviewOpen] = useState(false);
   const [primaryAspectRatio, setPrimaryAspectRatio] = useState('1 / 1');
 
+  useEffect(() => {
+    setPrimaryAspectRatio('1 / 1');
+  }, [primaryImage?.url]);
+
   return (
     <section className="project-brief-panel">
       <div className="flex items-start justify-between gap-4">