[feat] Improve queue job item UX based on design feedback (#6893)

## Summary
- Running jobs now show cancel button at all times (always visible, not
just on hover)
- Cancel/delete buttons use destructive red styling by default with
hover state
- Changed pending job icon from clock to loader-circle with spin
animation
- Fixed icon buttons to be square (size-6) instead of rectangular
- Added TODO comment for future declarative button config system
- Pending hint ("Job added to queue") now shows only once per entry and
no longer resets when other jobs update
- Spinner animation now applies only to the pending loader icon;
completed/check icons no longer spin
- Queue overlay hover/active state also triggers when hovering the top
menu bar so controls stay visible

## Design Spec

https://www.notion.so/comfy-org/Design-Queue-Dialog-Job-Ordering-and-Cancel-Button-Visibility-2b46d73d365081748a43d5cc9fbe2639

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6893-feat-Improve-queue-job-item-UX-based-on-design-feedback-2b56d73d365081a2bc7ef6f6fea1c739)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Claude <noreply@anthropic.com>

src/components/queue/QueueOverlayActive.vue

@@ -47,7 +47,7 @@
             v-tooltip.top="cancelJobTooltip"
             type="secondary"
             size="sm"
-            class="size-6 bg-secondary-background hover:bg-destructive-background"
+            class="size-6 bg-destructive-background hover:bg-destructive-background-hover"
             :aria-label="t('sideToolbar.queueProgressOverlay.interruptAll')"
             @click="$emit('interruptAll')"
           >