Retail UX blocks (P0): LocationHero, HoursStatusStrip, StickyShopBar, StoreSwitcher

[NicholasNewman]

Summary

Child of chesapeakedev/chesapeake#333. Add P0 retail UX blocks to @chesapeake/stack under components/retail/.

Scope — P0 blocks

Block	Purpose
LocationHero	Local headline + dual CTA (primary commerce, secondary directions)
HoursStatusStrip	Open/closed, pre-order cutoff, today's hours
StickyShopBar	Mobile persistent commerce CTA
StoreSwitcher	Cookie/geo-backed store selection; fixes wrong-location bugs

Also in this issue

• types/retail-location.ts — export RetailLocation and supporting types (coordinate with chesapeakedev/chesapeake#485)
• examples/retail-location-page.tsx — compose P0 blocks into a working example
• Export blocks from package index
• Patch release of @chesapeake/stack

Out of scope (follow-up issue)

P1: CategoryGrid, LocalGuideSection, FaqAccordion, LocalBusinessJsonLd
P2: QuickContactBar, DealsRow, ReviewsStrip, MapAndAccess

Acceptance criteria

• All four P0 components render in the example page with sample props
• Components use existing stack primitives (Button, Card, etc.) — no stack fork
• StoreSwitcher persists selected location (cookie or localStorage)
• HoursStatusStrip correctly shows open/closed from WeeklyHours input
• StickyShopBar visible on mobile viewport; fires onShopClick callback
• Types exported and documented in README or CHANGELOG
• Lint/format pass; example compiles

Dependencies

• Blocks: none (can start in parallel with #485)
• Unblocks: retail-starter Vite scaffold, Forest Baltimore demo

Phase

Phase A

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Parent epic: chesapeakedev/chesapeake#333