cod fix

src/api/types.ts

@@ -560,8 +560,17 @@ export interface OrderRow {
    */
   ordervalue?: number;
   orderamount?: number;
-  /** Cash to collect on delivery. Shown only when > 0. */
-  collectionamt?: number;
+  /*
+   * `collectionamt` was declared here and read by three screens. It does not
+   * exist in Fiesta — `grep -rn "collectionamt" --include=*.go` returns nothing
+   * — so every one of them showed a dash or zero from the day it was written.
+   * Removed 2026-09-28 along with those screens.
+   *
+   * A type can describe a field the server has never sent, and nothing catches
+   * it: the optional marker makes `undefined` legal, and `?? 0` turns it into a
+   * plausible figure. That is the trap, and it is worth remembering before the
+   * next optional money field is added on the strength of a field name.
+   */
   deliverycharge?: number;
   deliveryamt?: number;
   paymenttype?: number;