Add per-message timestamps in conversation UI

Claude Code currently does not display timestamps next to messages in the conversation view (terminal CLI, desktop, or web app). This makes it hard to:

• Track when a long-running task actually started or finished
• Re-orient after stepping away from a session for a while
• Audit when specific decisions or code changes were made
• Understand pacing across a multi-hour session

Other AI tools handle this well — Manus shows a timestamp label in the right margin of each message, ChatGPT and Claude.ai (web) show timestamps on hover. The underlying data already exists in Claude Code: every message in ~/.claude/projects/<project>/<session>.jsonl has a timestamp field. It just isn't surfaced in the UI.

Suggested implementation:

• Add an opt-in setting in settings.json, e.g.:

``json
"showMessageTimestamps": true
``

• Display a subtle timestamp on hover, or as a small label in the margin (similar to Manus) to avoid visual clutter
• Consider relative time for recent messages ("2 min ago") and absolute for older ones (HH:MM)
• Optional: a status-line variable like {currentTime} as a stopgap

Use case: solo founder running long multi-hour Claude Code sessions across several projects. Without timestamps it's easy to lose track of when something was discussed or shipped.

Thanks!