Return existing bootstrap thread IDs in welcome and guard root navigatio

- Server welcome now includes bootstrap project/thread IDs when cwd project/thread already exist
- Added regression test for reconnecting with persisted bootstrap state
- Root route ignores post-dispose welcome handling and marks thread as handled after navigate
cd685c9a64Julius Marminge committed on 2/27/2026, 4:52:30 AMparenta8d0e9b
3 files changedLine totals unavailable