feat(ep-commerce): add EPClearRefinements + EPCurrentRefinements (#315)

[field123]

Summary

• Ships items feat: add basic ep logo #1 and feat: copilot generative ai for editor app #2 of feat(ep-commerce): catalog-search component coverage gaps #304 — single-click clear-all + active-filter chip row for catalog search — closing the catalog-search component gap from PRD PRD: EPClearRefinements + EPCurrentRefinements (closes part of #304) + Pattern C adoption #315.
• Adds the wrapper-onClick pattern: clicks anywhere inside the wrapper trigger refine, no Studio interaction wiring needed. Click-on-chip dismisses that specific refinement; click-on-button (or anywhere in the Clear all wrapper) clears all filters. EPClearRefinements auto-hides when no filters are active.
• Extracts cloneWithInjectedHandlers as a deep module + 5 unit tests for future Pattern C adoption (Plasmic loader strips cloned-element props in slot defaults, so the wrapper-onClick path is what works in real projects; the helper is preserved for ad-hoc React children).
• Lazy-imports swr inside seedCartFallback so middleware bundles no longer crash with react.createContext is not a function when loading /server.

Closes

• Items feat: add basic ep logo #1 and feat: copilot generative ai for editor app #2 of feat(ep-commerce): catalog-search component coverage gaps #304 (parent issue stays open until remaining items ship)
• PRD PRD: EPClearRefinements + EPCurrentRefinements (closes part of #304) + Pattern C adoption #315

Test plan

• yarn jest plasmicpkgs/commerce-providers/elastic-path — 119 catalog-search tests + 5 helper tests pass (1587 EP-package tests overall)
• Verified end-to-end on examples/ep-commerce-app-router /products:
  • No filters → both Clear all and chip row hidden
  • 1 filter applied → 1 chip rendered with Tags: example (dynamic, title-cased), Clear all visible
  • 2 filters applied → 2 chips, click first chip removes only that filter
  • Clear all click → all filters cleared, controls auto-hide
• CI green

Out of scope (per PRD)

• Other items from feat(ep-commerce): catalog-search component coverage gaps #304 (autocomplete, hits-per-page, infinite hits, menu, toggle, numeric-menu, search-empty, hitsPerPage semantics fix)
• Pagination retro split into atomic Prev/Next/Indicator (separate follow-up)
• Backporting Pattern C improvements to AddToCartButton in @plasmicpkgs/commerce