Feature Request: Add /messages command to browse conversation history

Problem

Currently there is no built-in command to browse all messages in the current conversation. Users have to rely on terminal scrollback (Shift+Page Up/Down), which is limited by the terminal's scrollback buffer size.

The command can list messages, but it's designed for rewinding, not viewing — using it just to read old messages is confusing and risky (accidental rewind).

Suggestion

Add a or slash command that:

• Lists all user and assistant messages in the current session
• Supports arrow key navigation (↑/↓)
• Supports jumping between user messages ({/})
• Supports search/filter keywords
• View-only, no side effects (unlike /rewind)

Why

As conversations get long, it becomes difficult to find what was discussed earlier. A dedicated message browser would greatly improve the user experience.

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