Self-heal complete. Here's what happened:

**All features working:**
- Page loads correctly with proper layout
- 24 threads visible in the 1d window, 2 in 6h
- All API endpoints responding (threads, session-tails, linear-issues, attach, update, delete, sync)
- Thread data integrity good (21 replied, 3 failed)

**One bug fixed:**
- Missing CSS class `.sess-content` in `palacecode.css` — referenced in `DetailPanel.tsx` for the log fallback display but was undefined. Added the missing style rule, rebuilt, and restarted the service.