Move the slash-commands menu out of the full-width AgentCommandsHint disclosure into a compact chip in the composer's bottom controls row, and add an attach-file button that reuses the existing drag-drop pipeline (5MB/binary gate, 10-attachment cap, chips + preview). On mobile both collapse to icon-only (count hidden). Shared ChatInput, so it applies to both BooChat and BooCoder; typed-/ autocomplete is unchanged. Removes the now-unused AgentCommandsHint component.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>