fix: move clear queued controls into queue header (#8920)

## Summary
- Move queued-count summary and clear-queued action into the Queue Overlay header so controls remain visible while expanded content scrolls.

## What changed
- `QueueOverlayExpanded.vue`
  - Passes `queuedCount` and `clearQueued` through to the header.
  - Removes duplicated summary/action content from the lower section.
- `QueueOverlayHeader.vue`
  - Accepts new header data/actions for queued count and clear behavior.
  - Renders queued summary and clear button beside the title.
  - Adjusts layout to support persistent header actions.
- Updated header unit tests to cover queued summary rendering and clear action behavior.

## Testing
- Header unit tests were updated for the new behavior.
- No additional test execution was requested.

## Notes
- UI composition change only; queue execution semantics are unchanged.

Design: https://www.figma.com/design/LVilZgHGk5RwWOkVN6yCEK/Queue-Progress-Modal?node-id=3924-38560&m=dev

<img width="356" height="59" alt="Screenshot 2026-02-16 at 3 30 44 PM" src="https://github.com/user-attachments/assets/987e42bd-9e24-4e65-9158-3f96b5338199" />

src/components/queue/QueueOverlayHeader.test.ts

@@ -40,6 +40,8 @@ const i18n = createI18n({
       sideToolbar: {
         queueProgressOverlay: {
           running: 'running',
+          queuedSuffix: 'queued',
+          clearQueued: 'Clear queued',
           moreOptions: 'More options',
           clearHistory: 'Clear history'
         }
@@ -54,6 +56,7 @@ const mountHeader = (props = {}) =>
       headerTitle: 'Job queue',
       showConcurrentIndicator: true,
       concurrentWorkflowCount: 2,
+      queuedCount: 3,
       ...props
     },
     global: {
@@ -80,6 +83,25 @@ describe('QueueOverlayHeader', () => {
     expect(wrapper.find('.inline-flex.items-center.gap-1').exists()).toBe(false)
   })
 
+  it('shows queued summary and emits clear queued', async () => {
+    const wrapper = mountHeader({ queuedCount: 4 })
+
+    expect(wrapper.text()).toContain('4')
+    expect(wrapper.text()).toContain('queued')
+
+    const clearQueuedButton = wrapper.get('button[aria-label="Clear queued"]')
+    await clearQueuedButton.trigger('click')
+    expect(wrapper.emitted('clearQueued')).toHaveLength(1)
+  })
+
+  it('hides clear queued button when queued count is zero', () => {
+    const wrapper = mountHeader({ queuedCount: 0 })
+
+    expect(wrapper.find('button[aria-label="Clear queued"]').exists()).toBe(
+      false
+    )
+  })
+
   it('toggles popover and emits clear history', async () => {
     const spy = vi.spyOn(tooltipConfig, 'buildTooltipConfig')