feat: show active jobs label in top menu (#8169)

Replace the top-menu queue history icon with a localized “N active”
label so active jobs are visible at a glance.

Requested as part of the new
[designs](https://www.figma.com/design/LVilZgHGk5RwWOkVN6yCEK/Queue-Progress-Modal?node-id=3381-6181&m=dev).

I checked all failing snapshots and they are all expected (1 flaky).

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8169-feat-show-active-jobs-label-in-top-menu-2ee6d73d3650812cbf0cda389395c563)
by [Unito](https://www.unito.io)

---------

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

src/locales/en/main.json

@@ -761,6 +761,7 @@
       "sortJobs": "Sort jobs",
       "sortBy": "Sort by",
       "activeJobs": "{count} active job | {count} active jobs",
+      "activeJobsShort": "{count} active | {count} active",
       "activeJobsSuffix": "active jobs",
       "jobQueue": "Job Queue",
       "expandCollapsedQueue": "Expand job queue",
@@ -2666,4 +2667,4 @@
       "tooltip": "You are using a nightly version of ComfyUI. Please use the feedback button to share your thoughts about these features."
     }
   }
-}
+}