Why

When a user interrupts a turn while a hook is still running, the normal turn status is cleared but the separate live hook row can remain visible as Running because the TUI may never receive a matching HookCompleted event before cancellation. Once the turn itself is finalized, that turn-scoped live state should not remain on screen.

What

• clear any still-live active_hook_cell during turn finalization
• add a regression snapshot covering an interrupted turn with a visible PreToolUse hook row

Testing

• cargo test -p codex-tui interrupted_turn_clears_visible_running_hook
• attempted cargo test -p codex-tui (currently aborts on unrelated existing stack overflow in app::tests::discard_side_thread_removes_agent_navigation_entry)