## Why
Deleting a session, canceling an archived session resume or fork, and pressing `Esc` in a conversation open in another app previously exited the TUI. Local daemon and remote connections can instead return to the command center to select another conversation.
## What changed
- Return to the command center after successful deletion on local daemon and remote connections. Shut down side conversations before deletion and clear the deleted thread's local state.
- Return to the command center when an unarchive prompt is canceled, discarding startup input intended for the canceled resume or fork. Keep explicit quit actions and embedded server exit behavior.
- Make `Esc` open the command center from a conversation open in another app. Reselecting that conversation preserves its read-only snapshot and draft; `R` explicitly retries attachment.
- Update deletion confirmation text and keyboard hints to reflect these destinations.
## Testing
Add lifecycle tests for deletion success and failure, side conversation cleanup, unarchive cancellation and quitting, and read-only snapshot preservation. Add snapshots for command center navigation hints and deletion confirmation.
GitOrigin-RevId: 55a96358edb7af73949877a515614943bdc73643
08e49689b8