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- Stack textarea above button row on mobile (flex-direction: column) - font-size: 16px on textarea prevents iOS Safari auto-zoom on focus - body height: 100dvh adjusts dynamically as soft keyboard opens/closes - Right col goes horizontal (row) with full width on mobile - Hide height-row and enter-toggle (desktop-only concepts) - Larger touch targets for Send/Stop/Note - Hide session-id to reclaim vertical space Desktop layout unchanged. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>