fix: remove unused ts-expect-error and fix flaky drag test

- Remove stale @ts-expect-error in imagePreviewStore.test.ts (createMockNode
  now accepts Record<string, unknown> so animatedImages is valid)
- Add waitFor + nextFrame in interaction.spec.ts beforeEach to let canvas
  settle after UseNewMenu layout shift

Amp-Thread-ID: https://ampcode.com/threads/T-019c7313-f15a-707b-94a5-33f473a8dad5

browser_tests/tests/interaction.spec.ts

@@ -13,6 +13,9 @@ import type { NodeReference } from '../fixtures/utils/litegraphUtils'
 
 test.beforeEach(async ({ comfyPage }) => {
   await comfyPage.settings.setSetting('Comfy.UseNewMenu', 'Disabled')
+  // Wait for the legacy menu to appear and canvas to settle after layout shift.
+  await comfyPage.page.locator('.comfy-menu').waitFor({ state: 'visible' })
+  await comfyPage.nextFrame()
 })
 
 test.describe('Item Interaction', { tag: ['@screenshot', '@node'] }, () => {

src/stores/imagePreviewStore.test.ts

@@ -161,7 +161,6 @@ describe('imagePreviewStore getPreviewParam', () => {
 
   it('should return empty string if node.animatedImages is true', () => {
     const store = useNodeOutputStore()
-    // @ts-expect-error `animatedImages` property is not typed
     const node = createMockNode({ animatedImages: true })
     const outputs = createMockOutputs([{ filename: 'img.png' }])
     expect(store.getPreviewParam(node, outputs)).toBe('')