Narrow the remaining Chat components to curated props

[czarandy]

Fixes #439. Follow-up to #438, applying the same curated-props treatment to the rest of the Chat directory.

ChatPassthroughProps

The identity and description props every Chat container forwards to its root:

export interface ChatPassthroughProps {
  'aria-describedby'?: AriaAttributes['aria-describedby'];
  'aria-label'?: AriaAttributes['aria-label'];
  'aria-labelledby'?: AriaAttributes['aria-labelledby'];
  id?: string;
}

Applied to ChatLayout, ChatComposer, ChatMessage, ChatMessageList, ChatMessageBubble, ChatMessageMetadata, and ChatSystemMessage — replacing ComponentPropsWithoutRef<'div' | 'article'> in each.

ChatComposerInput is a textarea, so it extends the shared set with the text-input props a chat composer actually needs: autoComplete, enterKeyHint, maxLength, name, onBlur, onFocus, onPaste, and onKeyDown. That last one is worth flagging — the component already destructured and called onKeyDown, but only declared it via the wide extension, so narrowing without adding it explicitly would have broken the documented Enter-to-submit escape hatch.

Two behavior fixes that fall out of the narrowing

• ChatMessage dropped consumer labels. It spread ...rest before its generated aria-label/aria-labelledby, so <ChatMessage aria-label="…"> was silently overridden. The consumer's value now wins and falls back to the generated one.
• ChatMessageList hardcoded aria-live="polite" with no way to opt out. It's now a documented prop defaulting to polite, so a static transcript can pass aria-live="off".

Notes

• spellCheck was on my shortlist for ChatComposerInput but the repo's boolean-prop-naming rule rejects it, and inventing a hasSpellCheck alias for one speculative prop didn't seem worth it. Easy to add if you want it.
• This is a breaking change for anyone passing arbitrary DOM props to these components, same as Forward a shared set of button props across the *Button components #438 was for ChatScrollButton.

Tests

12 new tests: passthrough coverage per component, both ChatSystemMessage variants (it spreads in two branches), the consumer-label override on ChatMessage, the aria-live default and override, and the textarea's focus/blur/paste handlers.

Full suite passes (3197 tests), lint/typecheck/format clean.

https://claude.ai/code/session_01XFkkvUQfynGRedEYDNxKoY

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