VSCode extension: show timestamp on user prompts in session view

Feature Request

When reviewing a Claude Code session in the VSCode extension, it would be helpful to see a timestamp next to each user prompt.

Use case

When looking back at a long session, I want to know when I sent a prompt so I can:

• Correlate it with other events (builds, test runs, deploys)
• Understand how long a response took
• Orient myself in the session timeline

Suggested UX

• Show a subtle timestamp below or beside each user message (similar to most chat UIs)
• Optionally: show relative time (e.g. "2 minutes ago") by default with absolute time (e.g. "10:42 AM") on hover, to keep the interface clean

Current behavior

No timestamp is shown on messages in the session view.

Expected behavior

Each user prompt displays when it was sent.

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Submitted on behalf of a user via gh CLI.