feat: add Chat AI element

[rohanchkrabrty]

Summary

• Adds the Chat AI-element component to packages/raystack — a composable chat scroller with Chat.Messages, Chat.Item, Chat.JumpButton, Chat.Separator, and Chat.Attachment parts for building AI conversation UIs.
• Implements a stick-to-bottom message scroller (chat-messages.tsx) with a jump-to-latest button, plus a useChatMessages hook exposing imperative scroll/message actions via context.
• Ships attachment rendering with upload states (ChatAttachmentState) and CSS-module styling using --rs-* design tokens.
• Adds unit tests for the component and a docs page under the AI Elements section with demos and a props reference.
• Stacked on feat: add Reasoning AI element #864 (feat-ai-reasoning) — this PR only contains the Chat commit on top of it.

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Project	Deployment	Actions	Updated (UTC)
apsara	Ready	Preview, Comment	Jul 24, 2026 5:05am

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📥 Commits

Reviewing files that changed from the base of the PR and between 6d37652 and 5340cef.

📒 Files selected for processing (14)

• apps/www/src/content/docs/ai-elements/chat/demo.ts
• apps/www/src/content/docs/ai-elements/chat/index.mdx
• apps/www/src/content/docs/ai-elements/chat/props.ts
• apps/www/src/content/docs/ai-elements/meta.json
• packages/raystack/components/chat/__tests__/chat.test.tsx
• packages/raystack/components/chat/chat-attachment.tsx
• packages/raystack/components/chat/chat-context.tsx
• packages/raystack/components/chat/chat-item.tsx
• packages/raystack/components/chat/chat-messages.tsx
• packages/raystack/components/chat/chat-separator.tsx
• packages/raystack/components/chat/chat.module.css
• packages/raystack/components/chat/chat.tsx
• packages/raystack/components/chat/index.tsx
• packages/raystack/index.tsx

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