- Fix session load error by handling 404 gracefully
- Unify sidebar backgrounds to stone-100, make main-bg fully opaque
- Add divider + gap before new tab button, hide when last tab active
- Make tab hover cursor default, new tab button fully rounded
- Remove glass background from chat header
- Replace show/hide output button with clickable step labels
- Fix chat sidebar header to use solid background
- Set min-height on tab bar wrapper for loading state
Made-with: Cursor
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