Customer dashboard: Shipping and Shopping, as planned

Mockups drawn from docs/PARITY.md (sections 3, 4, 5) and docs/DESIGN.md (brand blue, Inter, sidebar on desktop, bottom navigation on phone). Phase 9 builds Shipping and Ship For Me; Phase 11 builds Buy For Me.

Nothing here is built yet (Phases 9 and 11 are "Not started" in docs/CHECKLIST.md). These are design previews of the plan, with sample data. Colours follow the admin's chosen brand colour.