feat: infinite scroll for chat messages

[walexjnr]

Summary

Completes the infinite scroll implementation for chat messages by wiring the missing props (isLoadingMore, irstMessageId) from useMessages into ChatWindow, which then passes them to MessageList.

What was missing

ChatWindow was only forwarding messages, onLoadMore, isLoading, and hasMore to MessageList. The two props that control scroll-position restoration and the loading spinner during pagination - isLoadingMore and irstMessageId - were not being passed, so the feature was incomplete.

Changes

• src/components/ChatWindow.tsx - destructure isLoadingMore and irstMessageId from useMessages and forward them to MessageList

No changes to useMessages or MessageList were needed; the logic was already correct.

Behaviour

• Scrolling to the top triggers IntersectionObserver ? calls loadMoreMessages ? fetches older messages
• Scroll position is restored to the first previously-visible message after load (via irstMessageId + scrollIntoView)
• Spinner shown at the top while older messages are loading (isLoadingMore)
• Duplicate loads prevented by loadingRef guard in useMessages

closes #151

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