fix: Fix image preview for Windows paths in playground (#12136)

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

Author: Cristhianzl

src/frontend/src/components/core/playgroundComponent/chat-view/chat-messages/components/__tests__/chat-message.test.tsx

@@ -180,13 +180,13 @@ describe("ChatMessage Component", () => {
       chat: {
         ...mockChat,
         message: "",
-        files: ["/path/to/file.jpg"],
+        files: ["/path/to/file.pdf"],
       },
     };
 
     render(<ChatMessage {...propsWithFiles} />);
-    // Should render UserMessage with file preview (shows loading icon for files)
-    expect(screen.getByTestId("loading-icon")).toBeInTheDocument();
+    // Should render UserMessage with file preview (non-image files show File icon)
+    expect(screen.getByTestId("forwarded-icon")).toBeInTheDocument();
   });
 
   it("renders bot message when no text and no files", () => {