Two gaps: the menu only offered an outbound "Order on Toast" link, and
the dashboard could only read. Both sides are now dynamic.

Ordering
- The 281-item menu board now comes from the database (new menu_sections
  and menu_products tables) instead of a static file, so anything edited
  in admin shows up on the public menu.
- Basket (React Context + localStorage), keyed by product + size so a
  large and a small of the same pizza are separate lines. Header button
  carries a live count.
- Checkout collects name, phone, address, delivery-vs-pickup and
  payment, with "rather just call?" kept as an option throughout.
- Card payment is SIMULATED: no provider is connected, only the last
  four digits and a fake authorisation reference are stored, and the
  form says so. A test asserts the full number never reaches the row.
- Delivery fee follows the advertised rule (free over $6).
- Range-priced items can't be ordered online — there's no single price
  to charge — so they stay phone-only rather than the server guessing.

Admin
- Tabs: Overview, Takeaway orders, Catering bookings, Menu, Coupons.
- Full CRUD over all 281 menu products and over the coupons, with
  server-side validation on both.
- Deleting a product that has already been ordered archives it instead:
  gone from the menu, still attached to past orders, still counted in
  revenue. Hard delete only for items never sold.
- Takeaway orders get their own table with line items, address, payment
  state and a kitchen workflow (new -> cooking -> out -> done).
- Overview now splits takeaway from catering, including cash vs card.

Orders are priced server-side here too: the browser sends only
{productId, sizeLabel, qty}.

Fixed a real bug found while testing: the basket and dish modal stayed
mounted after navigating to another route, so three dialogs could be
open at once. They now close on a route change, adjusted during render
rather than in an effect so it lands in the same commit as the route.

23 new tests (123 total). `npm run seed:demo` now also loads takeaway
orders so both halves of the dashboard have data to show.