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.vue

@@ -60,7 +60,7 @@
                     ? isQueueOverlayExpanded
                     : undefined
               "
-              class="px-3"
+              class="relative px-3"
               data-testid="queue-overlay-toggle"
               @click="toggleQueueOverlay"
               @contextmenu.stop.prevent="showQueueContextMenu"
@@ -68,6 +68,12 @@
               <span class="text-sm font-normal tabular-nums">
                 {{ activeJobsLabel }}
               </span>
+              <StatusBadge
+                v-if="activeJobsCount > 0"
+                data-testid="active-jobs-indicator"
+                variant="dot"
+                class="pointer-events-none absolute -top-0.5 -right-0.5 animate-pulse"
+              />
               <span class="sr-only">
                 {{
                   isQueuePanelV2Enabled
@@ -139,6 +145,7 @@ import { useI18n } from 'vue-i18n'
 
 import ComfyActionbar from '@/components/actionbar/ComfyActionbar.vue'
 import SubgraphBreadcrumb from '@/components/breadcrumb/SubgraphBreadcrumb.vue'
+import StatusBadge from '@/components/common/StatusBadge.vue'
 import QueueInlineProgressSummary from '@/components/queue/QueueInlineProgressSummary.vue'
 import QueueNotificationBannerHost from '@/components/queue/QueueNotificationBannerHost.vue'
 import QueueProgressOverlay from '@/components/queue/QueueProgressOverlay.vue'