The shopper funnel is collected but not shown #9

GET /v1/admin/analytics/storefront (OpenTaberna/fastapi#47) returns the journey before an
order exists — sessions, product views, carts, checkouts — and the storefront now reports it
(OpenTaberna/frontend#3). Nothing in the admin UI displays any of it.

Expected once solved

1. The shopper funnel on the Analytics page, alongside the order funnel.
2. Per-SKU view-to-cart rate, which is the figure sales data cannot show: a product viewed
   often and added rarely means the listing attracts people and something turns them away.
3. Top traffic paths.
4. When collection is off, the page says so rather than showing an empty funnel — "nobody
   visited" and "we are not counting" must not look identical.
5. The pre-order steps are labelled as a floor, not an exact count. Blocked scripts and
   closed tabs lose events, while the paid step is read from the orders table and is exact.
   Presenting them as one continuous measurement would overstate conversion.