[test] add test to verify panning on touch devices works as expected with Vue renderer (#5833)

## Summary

Added mobile touch pan interaction test for Vue nodes canvas
functionality.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5833-test-add-test-to-verify-panning-on-touch-devices-works-as-expected-with-Vue-renderer-27c6d73d3650810ebe01c0f7711670b9)
by [Unito](https://www.unito.io)

---------

Co-authored-by: github-actions <[email protected]>

Author: christian-byrne

browser_tests/tests/vueNodes/interactions/canvas/pan.spec.ts

@@ -0,0 +1,18 @@
+import {
+  comfyExpect as expect,
+  comfyPageFixture as test
+} from '../../../../fixtures/ComfyPage'
+
+test.describe('Vue Nodes Canvas Pan', () => {
+  test.beforeEach(async ({ comfyPage }) => {
+    await comfyPage.setSetting('Comfy.VueNodes.Enabled', true)
+    await comfyPage.vueNodes.waitForNodes()
+  })
+
+  test('@mobile Can pan with touch', async ({ comfyPage }) => {
+    await comfyPage.panWithTouch({ x: 64, y: 64 }, { x: 256, y: 256 })
+    await expect(comfyPage.canvas).toHaveScreenshot(
+      'vue-nodes-paned-with-touch.png'
+    )
+  })
+})