useMobileKeyboard now requires a focused input for keyboardOpen=true (both
the chrome-overlap and iOS-gap paths). The moment an input blurs, the hook
reports keyboardOpen=false instead of waiting hundreds of ms for iOS's
visualViewport dismissal animation to settle.
This makes App-level mobileKeyboardOpen flip false instantly on blur, so
MobileNavBar reappears and project-content regains nav-bar padding in the
same frame. The ChatView composer (and TodoModal/PlanningModeModal) snap
to their post-keyboard layout in one move instead of crawling down with
iOS's keyboard slide.
Replaces the per-component 450ms suppress hack in ChatView (also dropped
in this commit) which couldn't reach the parent layout's nav padding
state and produced "below tab bar then snap up" jitter.
Adds a regression test and updates four existing tests that assumed
"vv shrinks → keyboard up" without focus (focus is now required).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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