Three scoped overscroll fixes for the ChatView mobile keyboard-up case:
- .chat-messages: overscroll-behavior: contain so edge-swipes on the
messages list don't bounce the parent / document.
- .chat-input-area: overscroll-behavior: contain so swipes on the
composer footer don't escape upward.
- .chat-input-textarea: touch-action: pan-y + overscroll-behavior:
contain so a vertical swipe started on the textarea stays inside
the textarea (multi-line scroll still works) instead of
rubber-banding the page and exposing the body background.
User-reported symptom: keyboard up + swipe up on the textarea edge,
the composer shakes and a gray box (body background) partially
covers it.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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