Summary

• add a Split Tabs tip with contextual and ambient surfaces
• anchor the contextual tip to the Changes tab only when it is actually draggable
• document split-pane tab dragging and mark the split-tabs tip desktop-only so it is suppressed on mobile

Validation

• pnpm run check
• pnpm run finalize:web
• Playwright browser validation: desktop tip visible, mobile tip suppressed, Changes tab drag opens split panes
• pnpm run test:e2e (178 passed, 12 skipped)

Review

• Product review persona approved round 2 after the active-tab drag mismatch fix.