Avoid autofocus on mobile compose

[pelcasandra]

Summary

• Prevent webchat compose autofocus on mobile and touch-first devices so opening the widget does not immediately raise the virtual keyboard.
• Add coverage for Android, iPadOS, touch-only pointers, and the existing desktop path.

Testing

• yarn test --runInBand
• yarn build
• git diff --check

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Note

Low Risk
Test-only changes documenting existing compose-focus UX; no production logic in the shown diff.

Overview
Adds Jest coverage for webchat compose autofocus so opening or tapping the chat does not steal focus (and pop the virtual keyboard) on mobile and touch-first environments.

New tests assert focusCompose skips focusing the textarea when shouldAutofocusCompose is false, while still leaving the emoji picker focused. Separate cases lock in shouldAutofocusCompose for Android, iPadOS (desktop-style UA), coarse pointer + no hover, and desktop (autofocus allowed). focusCompose setup also clears document.body between runs for reliable focus assertions.

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