Add queue overlay tests and stories (#7342)

## Summary
- add Playwright queue list fixture and coverage for toggle/count
display
- update queue overlay unit tests plus storybook stories for inline
progress and job item
- adjust useJobList expectations for ordered tasks

main <-- https://github.com/Comfy-Org/ComfyUI_frontend/pull/7336 <--
https://github.com/Comfy-Org/ComfyUI_frontend/pull/7338 <--
https://github.com/Comfy-Org/ComfyUI_frontend/pull/7342

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7342-Add-queue-overlay-tests-and-stories-2c66d73d365081ae8e32d6e34f87e1d9)
by [Unito](https://www.unito.io)

browser_tests/fixtures/components/QueueList.ts

@@ -0,0 +1,57 @@
+import type { Page } from '@playwright/test'
+import { expect } from '@playwright/test'
+
+export class QueueList {
+  constructor(public readonly page: Page) {}
+
+  get toggleButton() {
+    return this.page.getByTestId('queue-toggle-button')
+  }
+
+  get inlineProgress() {
+    return this.page.getByTestId('queue-inline-progress')
+  }
+
+  get overlay() {
+    return this.page.getByTestId('queue-overlay')
+  }
+
+  get closeButton() {
+    return this.page.getByTestId('queue-overlay-close-button')
+  }
+
+  get jobItems() {
+    return this.page.getByTestId('queue-job-item')
+  }
+
+  get clearHistoryButton() {
+    return this.page.getByRole('button', { name: /Clear History/i })
+  }
+
+  async open() {
+    if (!(await this.overlay.isVisible())) {
+      await this.toggleButton.click()
+      await expect(this.overlay).toBeVisible()
+    }
+  }
+
+  async close() {
+    if (await this.overlay.isVisible()) {
+      await this.closeButton.click()
+      await expect(this.overlay).not.toBeVisible()
+    }
+  }
+
+  async getJobCount(state?: string) {
+    if (state) {
+      return await this.page
+        .locator(`[data-testid="queue-job-item"][data-job-state="${state}"]`)
+        .count()
+    }
+    return await this.jobItems.count()
+  }
+
+  getJobAction(actionKey: string) {
+    return this.page.getByTestId(`job-action-${actionKey}`)
+  }
+}