fix: add pulsing active-jobs indicator on queue button (#8915)

## Summary

Add a small pulsing blue indicator dot to the top-right of the `N
active` queue button when there are active jobs.

## Changes

- **What**: Reused `StatusBadge` (`variant="dot"`) in `TopMenuSection`
as a top-right indicator on the queue toggle button, shown only when
`activeJobsCount > 0` and animated with `animate-pulse`.
- **What**: Added tests to verify the indicator appears for nonzero
active jobs and is hidden when there are no active jobs.

## Review Focus

- Dot positioning on the queue button (`-top-0.5 -right-0.5`) across top
menu layouts.
- Indicator visibility behavior tied to `activeJobsCount > 0`.

## Screenshots (if applicable)


https://github.com/user-attachments/assets/9bdb7675-3e58-485b-abdd-446a76b2dafc

won't be shown on 0 active, I was just testing locally

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8915-fix-add-pulsing-active-jobs-indicator-on-queue-button-3096d73d36508181abf5c27662e0d9ae)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Alexander Brown <drjkl@comfy.org>

src/components/TopMenuSection.test.ts

@@ -215,6 +215,17 @@ describe('TopMenuSection', () => {
 
     const queueButton = wrapper.find('[data-testid="queue-overlay-toggle"]')
     expect(queueButton.text()).toContain('3 active')
+    expect(wrapper.find('[data-testid="active-jobs-indicator"]').exists()).toBe(
+      true
+    )
+  })
+
+  it('hides the active jobs indicator when no jobs are active', () => {
+    const wrapper = createWrapper()
+
+    expect(wrapper.find('[data-testid="active-jobs-indicator"]').exists()).toBe(
+      false
+    )
   })
 
   it('hides queue progress overlay when QPO V2 is enabled', async () => {