Added scroll-to-bottom button in chat view

[notsolvablehat]

Related to #278906

Problem

Long chat conversations make it inconvenient to return to the latest message after scrolling up, especially in active sessions.

Solution

Added a floating scroll-to-bottom button that appears when the user scrolls away from the bottom of the chat list. Clicking the button smoothly scrolls to the latest item.

Behaviour

• Button is hidden when the user is already near the bottom.
• Button becomes visible when the user scrolls up beyond a threshold (80%).

Proof

=========

[vs-code-engineering]

📬 CODENOTIFY

The following users are being notified based on files changed in this PR:

@bpasero

Matched files:

• src/vs/workbench/contrib/chat/browser/agentSessions/experiments/agentTitleBarStatusWidget.ts

@lszomoru

Matched files:

• src/vs/workbench/contrib/scm/browser/scmViewPane.ts

[notsolvablehat]

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