Two iOS Safari-specific fixes for mobile chat:
- ChatView: the main chat keyboard collapsed the instant it opened
because .chat-thread--keyboard-active declared transform/will-change in
CSS, keeping a non-none transform on an ancestor of the focused
composer textarea. iOS blurs a focused input when an ancestor
establishes a transform containing block. Drive the drift transform in
JS only when iOS actually shifts the viewport (offsetTop > 0); the
ancestor stays transform:none on focus so the keyboard stays up.
- QuickChatFAB: the FAB never opened on iPhone because the drag hook
calls setPointerCapture() in pointerdown, which makes WebKit swallow
the synthetic click. Fire the open/close toggle from the drag hook's
pointerup on a tap (a real gesture, so stealth-input focus still raises
the keyboard); keep onClick for mouse/tests with a timer-cleared dedupe.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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