feat(react): forward autoResize from useApp to App

[ochafik]

Summary

Stacked on #620.

useApp() previously hardcoded autoResize: true when constructing the App. This exposes it as a hook option (default unchanged) so callers can disable the built-in ResizeObserver and drive sizing themselves via useAutoResize or manual sendSizeChanged() calls.

Test plan

• Typecheck clean.
• Default unchanged: omitting autoResize still passes true.

[github-actions]

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commit: cc61c07