Backend:
- Add _recover_stale_tasks() to reset tasks stuck in 'in_progress'
from previous crashes (tasks >5 min old get reset to pending)
- Called automatically on startup
Frontend:
- Fix dark mode colors using CSS variables instead of hardcoded values
- Add elapsed time column showing how long task has been running
- Add spinning indicator next to package name
- Add status badge (Running/Stale?)
- Highlight stale tasks (>5 min) in amber
- Auto-updates every 5 seconds with existing refresh
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