feat: add job history and assets sidebar badge behavior (#9050)

## Summary
Add sidebar badge behavior for queue/asset visibility updates:
- Job History tab icon shows active jobs count (`queued + running`) only
when the Job History panel is closed.
- Assets tab icon no longer mirrors active jobs; when QPO V2 is enabled
it now shows the number of assets added since the last time Assets was
opened.
- Opening Assets clears the unseen added-assets badge count.

## Changes
- Added `iconBadge` logic to Job History sidebar tab.
- Replaced Assets sidebar badge source with new unseen-assets counter
logic.
- Added `assetsSidebarBadgeStore` to track unseen asset additions from
history updates and reset on Assets open.
- Added/updated unit tests for both sidebar tab composables and the new
store behavior.


https://github.com/user-attachments/assets/33588a2a-c607-4fcc-8221-e7f11c3d79cc



┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9050-fix-add-job-history-and-assets-sidebar-badge-behavior-30e6d73d365081c38297fe6aac9cd34c)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Johnpaul Chiwetelu <49923152+Myestery@users.noreply.github.com>
Co-authored-by: GitHub Action <action@github.com>

src/stores/queueStore.test.ts

@@ -535,6 +535,7 @@ describe('useQueueStore', () => {
 
       await store.update()
       const initialTask = store.historyTasks[0]
+      const initialHistoryTasks = store.historyTasks
 
       // Same job with same outputs_count
       mockGetHistory.mockResolvedValue([{ ...job }])
@@ -543,6 +544,8 @@ describe('useQueueStore', () => {
 
       // Should reuse the same instance
       expect(store.historyTasks[0]).toBe(initialTask)
+      // Should preserve array identity when history is unchanged
+      expect(store.historyTasks).toBe(initialHistoryTasks)
     })
   })