[UI] Redesign media asset card layout (#6541)

## Summary
- Reorganized media asset card layout for improved UX
- Moved duration/format chips to top-left (visible in default state)
- Replaced multiple action buttons with zoom + more menu pattern
- Repositioned output count to top-right for better visibility

## Changes
1. **Duration & format chips**: Moved from bottom-left to top-left,
shown when card is not hovered and media is not playing
2. **Media actions**: Simplified to zoom button + more menu (contains
delete, download options), shown on hover or during playback
3. **Output count**: Relocated from bottom-right to top-right for
consistent positioning

## Test plan
- [x] Verify duration/format chips appear in top-left when card is idle
- [x] Confirm action buttons (zoom + more) appear on hover
- [x] Check output count displays correctly in top-right
- [x] Test transitions between hover/non-hover states
- [x] Verify media playback doesn't interfere with UI elements

🤖 Generated with [Claude Code](https://claude.ai/code)

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6541-UI-Redesign-media-asset-card-layout-29f6d73d365081eb8614d5dc9b2dc214)
by [Unito](https://www.unito.io)

src/components/sidebar/tabs/AssetsSidebarTab.vue

@@ -170,7 +170,7 @@ import { formatDuration, getMediaTypeFromFilename } from '@/utils/formatUtil'
 
 import AssetsSidebarTemplate from './AssetSidebarTemplate.vue'
 
-const activeTab = ref<'input' | 'output'>('input')
+const activeTab = ref<'input' | 'output'>('output')
 const folderPromptId = ref<string | null>(null)
 const folderExecutionTime = ref<number | undefined>(undefined)
 const isInFolderView = computed(() => folderPromptId.value !== null)