Agents view: navigating into an agent and back (←) leaves stale/garbled frame until terminal resize

Summary

In the multi-agent task list ("agents") view, opening an agent's detail and then returning to the list does only a partial redraw. The previous detail content overlaps the task list, header, and logo art. The TUI does not perform a full repaint on back-navigation, so the list view stays corrupted.

Environment

• Version: 2.1.165
• OS: Windows Terminal + WSL2 (Ubuntu), 6.6.x-microsoft-standard-WSL2

Steps to reproduce

1. Have at least 2 background agents/tasks so the agents list view shows entries.
2. From the agents list, enter an agent's detail (→ / enter).
3. Navigate back to the list (←).
4. The list view is rendered garbled — stale detail-frame content overlaps the task rows, header, and logo.

Workaround

• Any terminal resize triggers SIGWINCH → full repaint → fixes it.
• pkill -WINCH -f claude (sends SIGWINCH without moving the window) also fixes it.
• Ctrl+L does not fix it.

Expected

A full repaint on back-navigation, leaving no stale frame from the agent detail view.