Major improvements:
- Replace table with card-based layout below 1400px width
- Cards show ticket ID, title, category, assignee, status, and actions
- Priority indicated by left border color
- Fully responsive from 1400px down to mobile
Mobile improvements (768px and below):
- Cards stack vertically with touch-friendly sizing
- Action buttons are full-width with 44px touch targets
- Meta info displayed in a clean row format
- Removed old table-based mobile styles
Sidebar collapse improvements:
- Collapsed state now truly saves space (0 width, no gap)
- Expand button is compact vertical text
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>