Mark TUI, session list & dump, and transcription output epics as
completed — all child tasks done.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Quit dialog: centered 26×5 Clear+Block overlay triggered by q/Q,
confirms with q, dismisses with Esc. Help modal: centered 32×14 overlay
triggered by ?, lists all keyboard shortcuts, dismisses with Esc.
Both modals intercept all input while open. Wired into run.rs dispatch.
Closes claudbg-1e1c
Closes claudbg-1tlk
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>