Simplify navigation menu (14+ items → 5-6 dropdowns)

The navigation bar displays 14+ items simultaneously, which overwhelms new visitors and makes it harder to find key categories. This creates cognitive overload, especially on smaller screens.

Consolidate navigation into 5-6 top-level items with dropdowns: (1) Shop (New Arrivals, Best Sellers, All Collections), (2) Clothing (Cardigans, T-Shirts, Sweatshirts, Jackets, Hoodies), (3) Accessories (Enamel Pins, Tote Bags, Stickers), (4) Custom Pins, (5) Our Story, (6) Support P+M. Update in Shopify Admin → Online Store → Navigation.