claudbg/.beans/claudbg-ut9q--tui-terminal-setup-event-loop-and-teardown.md

title	status	type	priority	created_at	updated_at	parent	blocked_by
TUI: terminal setup, event loop, and teardown	todo	task	normal	2026-03-30T04:45:32Z	2026-03-30T04:49:03Z	claudbg-i6l2	claudbg-nq36

Implement terminal initialization, the main event loop, and graceful teardown.

Responsibilities

1. Setup: enable raw mode (crossterm::terminal::enable_raw_mode), switch to alternate screen (EnterAlternateScreen), create CrosstermBackend, instantiate ratatui::Terminal.

2. Panic hook: install a panic hook that restores the terminal before printing the panic message (prevents garbled terminal on crash).

3. Event loop: loop { terminal.draw(|f| render(f, &state)); if event::poll(Duration::from_millis(50))? { handle_event(event::read()?, &mut state); } if state.should_quit { break; } }

4. Teardown: disable raw mode, leave alternate screen.

Entry point

Replaces the stub in src/commands/stubs.rs (the Tui command handler). The tui() async function should call into a synchronous run_tui() function since ratatui is sync.

Notes

• Use crossterm::event::Event for keyboard input — no mouse needed for this milestone.
• The 50 ms poll timeout gives ~20 fps without busy-spinning.
• Teardown must run even on error: use a RAII guard or wrap in a closure.

Blocked by

• ratatui deps (claudbg-78xt), app state (claudbg-nq36)