[test] add browser tests verifying Vue node groups behaviors (#5825)

## Summary

Adds Playwright tests verifying node groups behaviors work in the Vue
nodes system - in particular:

- Using hotkey to create a group around selected Vue nodes
- Using the "fit to contents" feature on a group that contains Vue nodes

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5825-test-add-browser-tests-verifying-Vue-node-groups-behaviors-27c6d73d365081e1a380ea5c43a861b0)
by [Unito](https://www.unito.io)

---------

Co-authored-by: github-actions <github-actions@github.com>

browser_tests/tests/vueNodes/groups/groups.spec.ts

@@ -0,0 +1,33 @@
+import {
+  comfyExpect as expect,
+  comfyPageFixture as test
+} from '../../../fixtures/ComfyPage'
+
+const CREATE_GROUP_HOTKEY = 'Control+g'
+
+test.describe('Vue Node Groups', () => {
+  test.beforeEach(async ({ comfyPage }) => {
+    await comfyPage.setSetting('Comfy.VueNodes.Enabled', true)
+    await comfyPage.vueNodes.waitForNodes()
+  })
+
+  test('should allow creating groups with hotkey', async ({ comfyPage }) => {
+    await comfyPage.page.getByText('Load Checkpoint').click()
+    await comfyPage.page.getByText('KSampler').click({ modifiers: ['Control'] })
+    await comfyPage.page.keyboard.press(CREATE_GROUP_HOTKEY)
+    await expect(comfyPage.canvas).toHaveScreenshot(
+      'vue-groups-create-group.png'
+    )
+  })
+
+  test('should allow fitting group to contents', async ({ comfyPage }) => {
+    await comfyPage.setup()
+    await comfyPage.loadWorkflow('groups/oversized_group')
+    await comfyPage.ctrlA()
+    await comfyPage.executeCommand('Comfy.Graph.FitGroupToContents')
+    await comfyPage.nextFrame()
+    await expect(comfyPage.canvas).toHaveScreenshot(
+      'vue-groups-fit-to-contents.png'
+    )
+  })
+})