TUI: make mixed conversations readable at a glance #159

Parent

Parent: #158

What to build

Make a real mixed-turn terminal conversation readable at a glance. Render user prompts, assistant responses, tool activity, system notices, and failures with a consistent hierarchy and compact rhythm while preserving chronological order and the existing fixed composer. Avoid large empty cards, ornamental dashboards, and repeated metadata.

Acceptance criteria

• User, assistant, tool, system, and error events remain distinguishable without depending on color alone.
• Consecutive events use consistent spacing, labels, wrapping, and timestamps or metadata only where they add value.
• Long content has a compact preview and an explicit keyboard-accessible way to inspect the remainder.
• The active turn and composer remain visible and stable during a realistic multi-turn session.
• Focused tests cover mixed event ordering, wrapping, and long-content disclosure.
• A real 120x36 tmux scenario bound to the exact PR head publishes the transcript, ANSI capture, readable image, timeline, and PASS report.

Blocked by

None - can start immediately