Add Pinterest product tag: discover filter, Reels badge, and images-step checkbox

- Pinterest filter toggle on the Shop discover page, alongside "All",
  backed by the backend's new ?pinterest=true param on
  /shop-products/discover
- Pinterest badge shown above the favorite button in ShopReelsView's
  action rail for products tagged is_pinterest
- "Pinterest product" checkbox at the bottom of the product images step
  (create wizard and edit flow share the same route)
- New pinterest bold-icon SVG under public/images/icons/vuesax/bold

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

public/images/icons/vuesax/bold/pinterest.svg

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