test: use queue button page object in e2e

The dropdown deliberately stays open after selecting a mode
(`@select.prevent` on DropdownMenuItem in ComfyQueueButton.vue,
introduced in #9134 as part of the Figma run-controls redesign).

The previous test asserted the menu hides after selection, which
contradicts the implementation and failed in CI. Replace it with a
behavior-meaningful assertion: selecting 'Run (On Change)' updates the
Run button label, proving the mode change took effect.

browser_tests/fixtures/components/Actionbar.ts

@@ -36,13 +36,31 @@ class ComfyQueueButton {
   }
 
   public async toggleOptions() {
+    return await this.openOptions()
+  }
+
+  public async openOptions() {
     await this.dropdownButton.click()
     return new ComfyQueueButtonOptions(this.actionbar.page)
   }
 }
 
 class ComfyQueueButtonOptions {
-  constructor(public readonly page: Page) {}
+  public readonly menu: Locator
+  public readonly modeItems: Locator
+
+  constructor(public readonly page: Page) {
+    this.menu = page.getByRole('menu')
+    this.modeItems = this.menu.getByRole('menuitem')
+  }
+
+  public modeItem(name: string) {
+    return this.menu.getByRole('menuitem', { name, exact: true })
+  }
+
+  public async selectMode(name: string) {
+    await this.modeItem(name).click()
+  }
 
   public async setMode(mode: AutoQueueMode) {
     await this.page.evaluate((mode) => {

browser_tests/tests/queueButtonModes.spec.ts

@@ -0,0 +1,63 @@
+import { expect } from '@playwright/test'
+
+import type { PromptResponse } from '@/schemas/apiSchema'
+
+import { comfyPageFixture as test } from '@e2e/fixtures/ComfyPage'
+
+const queueModeLabels = ['Run', 'Run (On Change)', 'Run (Instant)']
+const runOnChangeLabel = queueModeLabels[1]
+
+test.describe('Queue button modes', { tag: '@ui' }, () => {
+  test('Run button is visible in topbar', async ({ comfyPage }) => {
+    await expect(comfyPage.actionbar.queueButton.primaryButton).toBeVisible()
+  })
+
+  test('Queue mode trigger menu is visible', async ({ comfyPage }) => {
+    await expect(comfyPage.actionbar.queueButton.dropdownButton).toBeVisible()
+  })
+
+  test('Clicking queue mode trigger opens mode menu', async ({ comfyPage }) => {
+    const options = await comfyPage.actionbar.queueButton.openOptions()
+
+    await expect(options.menu).toBeVisible()
+  })
+
+  test('Queue mode menu shows available modes', async ({ comfyPage }) => {
+    const options = await comfyPage.actionbar.queueButton.openOptions()
+
+    await expect(options.menu).toBeVisible()
+    await expect(options.modeItems).toHaveText(queueModeLabels)
+  })
+
+  test('Selecting a non-default mode updates the Run button label', async ({
+    comfyPage
+  }) => {
+    const queueButton = comfyPage.actionbar.queueButton
+    const options = await queueButton.openOptions()
+
+    await expect(options.menu).toBeVisible()
+    await options.selectMode(runOnChangeLabel)
+
+    await expect(queueButton.primaryButton).toContainText(runOnChangeLabel)
+  })
+
+  test('Run button sends prompt when clicked', async ({ comfyPage }) => {
+    let promptQueued = false
+    const mockResponse: PromptResponse = {
+      prompt_id: 'test-id',
+      node_errors: {},
+      error: ''
+    }
+    await comfyPage.page.route('**/api/prompt', async (route) => {
+      promptQueued = true
+      await route.fulfill({
+        status: 200,
+        body: JSON.stringify(mockResponse)
+      })
+    })
+
+    await comfyPage.actionbar.queueButton.primaryButton.click()
+
+    await expect.poll(() => promptQueued).toBe(true)
+  })
+})