Feature Request

Add a floating "scroll to bottom" button in the webchat that appears when the user has scrolled up from the bottom of the conversation.

Motivation

• Common chat UX pattern
• Easy way to return to latest messages after reading history
• Visual indicator that there's more content below

Implementation

• Small circular button with down chevron icon
• Appears at bottom-center when !isPinnedToBottom
• Semi-transparent with .ultraThinMaterial background
• Animates scroll to bottom on tap
• Fade+scale transition when appearing/disappearing

Files affected

• apps/shared/ClawdbotKit/Sources/ClawdbotChatUI/ChatView.swift