- Reorder frames in ui-design.pen for better spatial organization - Add docs/DESIGN-SYSTEM-PROPOSAL.md: full design system analysis and roadmap - Identifies 13 duplicated patterns (NoteList/Item x10, Inspector headers x7, etc.) - Proposes atomic structure: atoms → molecules → organisms - 6-phase implementation plan (16-22h total, phases 1-3 = 80% value) - Naming conventions, component inventory, canvas layout strategy