When "Walk-in" is selected on the new order form, an optional name input
now appears. If filled, a new customer is created and linked to the order;
if left blank, the order remains a nameless walk-in as before.
Adds a new Restock page that lists all products with their current stock
and lets the user enter quantities to add in bulk, using the existing
PATCH /products/:id/stock endpoint.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
adamp
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