The Storefront API only returns ProductVariant.quantityAvailable when the
app has the unauthenticated_read_product_inventory scope, and nothing in
the template reads the field — availableForSale already drives stock state.
Also hides the editor left sidebar by default in PageEditor.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FaxyZTjAyd7UXK8xpQpF7o
