diff --git a/desktop/frontend-next/src/ui/cards/ToolOutput.tsx b/desktop/frontend-next/src/ui/cards/ToolOutput.tsx
index ae2cabfcff..855cc2f1da 100644
--- a/desktop/frontend-next/src/ui/cards/ToolOutput.tsx
+++ b/desktop/frontend-next/src/ui/cards/ToolOutput.tsx
@@ -298,7 +298,7 @@ function Clip({ id, deps, children }: { id?: string; deps?: unknown; children: R
       // Collapsing now takes time, and mid-transition this measures an intermediate
       // height — at that instant the test flips to "not overflowing" and pulls the
       // expand button. While one is running, wait for it to settle.
-      if (!el.getAnimations().length) measure();
+      if (!el.getAnimations?.().length) measure();
     });
     el.addEventListener("transitionend", measure);
     return () => {
diff --git a/desktop/frontend-next/src/ui/image-preview.interaction.test.tsx b/desktop/frontend-next/src/ui/image-preview.interaction.test.tsx
index c33a9850e9..050f74a2cb 100644
--- a/desktop/frontend-next/src/ui/image-preview.interaction.test.tsx
+++ b/desktop/frontend-next/src/ui/image-preview.interaction.test.tsx
@@ -1,6 +1,6 @@
 // @vitest-environment jsdom
 import "./testkit";
-import { afterEach, describe, expect, it, vi } from "vitest";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 import { cleanup, fireEvent, render, screen, waitFor, within } from "@testing-library/react";
 import userEvent from "@testing-library/user-event";
 import { UserCard } from "./cards/UserCard";
@@ -12,6 +12,8 @@ import type { AgentPort, SessionStatus } from "../port/port";
 
 Element.prototype.getAnimations ??= () => [];
 
+// jsdom has no pointer capture, which the viewer takes when a drag starts.
+beforeEach(() => { HTMLElement.prototype.setPointerCapture = vi.fn(); });
 afterEach(() => { cleanup(); vi.restoreAllMocks(); });
 
 const path = ".reasonix/attachments/preview.png";