Two independent UI/UX fixes:
- auto_name.ts: pass the session's own model as fallbackModel to
taskModelCompletion, so chat rename uses whatever model is already
loaded on llama-swap instead of forcing a swap to DEFAULT_MODEL
(which times out at 10s when a different model is active).
- useWorkspacePanes.ts: when the last tab in a pane is closed and
other panes exist, remove the pane entirely instead of leaving an
orphaned empty panel.