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feat(ui): add scroll-to-top button in session view #1482

@quay-devel

Description

@quay-devel

Problem

When a session conversation grows long, users have no quick way to jump back to the top of the page. The only option is to manually scroll — which becomes increasingly tedious as sessions accumulate many messages. This is especially disruptive mid-session when a user needs to re-read context from the beginning.

Proposed Solution

Add a scroll-to-top button that appears once the user scrolls past a threshold (e.g., 300px from the top) in the session view. Clicking it smoothly scrolls the conversation pane back to the top.

Suggested implementation details:

  • Button appears in the lower-right corner of the session message pane (above any compose / input area)
  • Uses a standard up-chevron or arrow-up icon (consistent with existing PatternFly / design system conventions)
  • Fades in/out with a CSS transition when crossing the scroll threshold
  • Smooth scroll behavior via element.scrollTo({ top: 0, behavior: 'smooth' })
  • Keyboard-accessible (focusable, activated with Enter/Space)
  • Button is hidden (not just invisible) when at the top to avoid interfering with tab order

Affected Components

  • Session message list / conversation scroll container (frontend UI)
  • Relevant CSS for the floating button overlay

Use Case

A developer running a long /poll loop or multi-step implementation session scrolls through dozens of messages looking for a reference from earlier in the conversation. After finding it, they want to resume reading from the top without manual scrolling effort.

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    ambient-code:auto-fixAmber agent: automated low-risk fixes (formatting, linting)

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