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/composables/sidebarTabs/useJobHistorySidebarTab.ts

@@ -1,6 +1,8 @@
 import { markRaw } from 'vue'
 
 import JobHistorySidebarTab from '@/components/sidebar/tabs/JobHistorySidebarTab.vue'
+import { useQueueStore } from '@/stores/queueStore'
+import { useSidebarTabStore } from '@/stores/workspace/sidebarTabStore'
 import type { SidebarTabExtension } from '@/types/extensionTypes'
 
 export const useJobHistorySidebarTab = (): SidebarTabExtension => {
@@ -11,6 +13,16 @@ export const useJobHistorySidebarTab = (): SidebarTabExtension => {
     tooltip: 'queue.jobHistory',
     label: 'queue.jobHistory',
     component: markRaw(JobHistorySidebarTab),
-    type: 'vue'
+    type: 'vue',
+    iconBadge: () => {
+      const sidebarTabStore = useSidebarTabStore()
+      if (sidebarTabStore.activeSidebarTabId === 'job-history') {
+        return null
+      }
+
+      const queueStore = useQueueStore()
+      const count = queueStore.activeJobsCount
+      return count > 0 ? count.toString() : null
+    }
   }
 }