fix: keep remote image markdown when normalization fails

app/(chat)/api/chat/route.ts

@@ -929,18 +929,37 @@ async function normalizeAssistantImageMarkdown(
           altText,
           thumbnailUrl
         );
-        const hostedThumbnailUrl = await ensureHostedImageUrl(thumbnailUrl);
-        const hostedOriginalUrl =
-          originalUrl && originalUrl !== thumbnailUrl
-            ? await ensureHostedImageUrl(originalUrl)
-            : hostedThumbnailUrl;
 
-        uploadedUrls.push(hostedThumbnailUrl);
+        let hostedThumbnailUrl = thumbnailUrl;
-        uploadedUrls.push(hostedOriginalUrl);
+        let hostedOriginalUrl =
-        rebuilt += `![thumb|||${hostedOriginalUrl}|||${parsedImageSize || imageSize}](${hostedThumbnailUrl})`;
+          originalUrl && originalUrl !== thumbnailUrl ? originalUrl : thumbnailUrl;
+
+        try {
+          hostedThumbnailUrl = await ensureHostedImageUrl(thumbnailUrl);
+        } catch (error) {
+          console.error("[Chat API] Failed to normalize remote thumbnail URL:", error);
+        }
+
+        if (originalUrl && originalUrl !== thumbnailUrl) {
+          try {
+            hostedOriginalUrl = await ensureHostedImageUrl(originalUrl);
+          } catch (error) {
+            console.error("[Chat API] Failed to normalize remote original URL:", error);
+            hostedOriginalUrl = hostedThumbnailUrl || originalUrl;
+          }
+        } else {
+          hostedOriginalUrl = hostedThumbnailUrl;
+        }
+
+        const finalThumbnailUrl = hostedThumbnailUrl || thumbnailUrl;
+        const finalOriginalUrl = hostedOriginalUrl || finalThumbnailUrl;
+
+        uploadedUrls.push(finalThumbnailUrl);
+        uploadedUrls.push(finalOriginalUrl);
+        rebuilt += `![thumb|||${finalOriginalUrl}|||${parsedImageSize || imageSize}](${finalThumbnailUrl})`;
       } catch (error) {
-        console.error("[Chat API] Failed to normalize remote image URL:", error);
+        console.error("[Chat API] Failed to parse remote image markdown metadata:", error);
-        rebuilt += "";
+        rebuilt += matchText;
       }
 
       cursor = start + matchText.length;