fix(ui): display agent-generated images in response markdown (#1601)

Signed-off-by: Petr Kadlec <petr@puradesign.cz>

Author: kapetr

apps/agentstack-ui/src/components/MarkdownContent/utils.ts

@@ -5,10 +5,18 @@
 
 import { defaultUrlTransform } from 'react-markdown';
 
+import { PLATFORM_FILE_CONTENT_URL_BASE } from '#api/a2a/constants.ts';
+import { getFileIdFromFilePlatformUrl } from '#api/a2a/utils.ts';
+import { getFileContentUrl } from '#modules/files/utils.ts';
+
 export function urlTransform(value: string): string {
   if (value.startsWith('data:image/')) {
     return value;
   }
 
+  if (value.startsWith(PLATFORM_FILE_CONTENT_URL_BASE)) {
+    return getFileContentUrl(getFileIdFromFilePlatformUrl(value));
+  }
+
   return defaultUrlTransform(value);
 }