The mobile chat keyboard would not reliably stay up on iOS. The cause was
the visibilitychange/pageshow 'resync' effect in ChatView: it only ever
ran while the composer was already focused (its activeElement guard), and
on iOS a programmatic focus() fired from setTimeout has no user-gesture
context, so it could not re-raise the keyboard after the blur(). Every
spurious iOS visibilitychange (Control Center, notification banners, app
switches) therefore dismissed the keyboard mid-session and never restored
it.
Remove the blur()+focus() resync. The visualViewport half-state it
targeted is already handled by useMobileKeyboard, which re-snapshots vv
metrics on visibilitychange/pageshow via its settle tail + rAF stability
poll without ever touching textarea focus.
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