[FEATURE] Feature request: quick "jump to first message" button in long conversations

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

In long conversations, I often need to go back to the first answer
(or an earlier answer) to re-read it or to ask a follow-up question
about it. Right now the only way is to scroll up manually, which is
slow and tedious in long sessions — sometimes it takes a long time
just to find that first answer. Users who work in long sessions
(coding, content work, reviews) constantly refer back to earlier
answers, so this is a daily friction point.

Proposed Solution

Add a button (or keyboard shortcut) to jump directly to the top /
first message of the conversation, and a way to jump back down
again. Even a simple "scroll to top" arrow would already save a lot
of time. A small floating navigation (like a table of contents of
the conversation) would be even better.

Alternative Solutions

_No response_

Priority

Critical - Blocking my work

Feature Category

CLI commands and flags

Use Case Example

Please add a quick way to jump back to the first message/answer in a
long conversation — a button, a keyboard shortcut, or a small
floating navigation. Scrolling up manually to find an earlier answer
is slow and it is something long-session users do many times a day.

Additional Context

_No response_