Sealed detail now places previous/next arrows around the item identity. The route snapshots the distinct, currently loaded filtered products from Explorer or a binder; navigation does not load unseen catalogue pages. Next wraps from the last product to the first. Previous is disabled on the first product, matching card navigation. Without multiple products or valid context, no arrows are shown.

Each change replaces the detail route, retaining the parent list and its scroll state. The existing keyed product detail remount resets product-specific quote, ownership subscriptions, images and forms. No collection write occurs.

Tests exercise route ordering/wrapping/boundaries, the rendered arrows and both list entry points. A non-destructive Maestro scenario covers return to the Explorer grid; not executed because the VPS has no Maestro/emulator and local demo resources are preserved. Prepared for staging, not merged or deployed.