With the Split button hidden on mobile (G1), users need another path to create additional chat panes. Add a "New chat" ContextMenuItem at the top of each tab's context menu, separated from Rename / Close / etc. by a ContextMenuSeparator. Wired to the existing onNewChat prop — no plumbing change. Available on both long-press (mobile) and right-click (desktop). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>