fix(pos): type checkout test stub as PosPb to satisfy tsc

Co-Authored-By: Claude <noreply@anthropic.com>

src/lib/server/pos-service.test.ts

@@ -4,6 +4,7 @@ import {
   listActiveStockCatalog,
   listSalesInRange,
   searchCustomersForPos,
+  type PosPb,
 } from "./pos-service";
 
 function stubPb(items: unknown[]) {
@@ -88,6 +89,8 @@ function stubCheckoutPb(opts: {
   let itemCounter = 0;
 
   return {
+    // Cast because the stub's collection() returns concrete row shapes,
+    // while PosPb declares getList/getOne/create generically.
     pb: {
       collection: (name: string) => ({
         getFullList: vi.fn(),
@@ -147,7 +150,7 @@ function stubCheckoutPb(opts: {
           return { id, ...data };
         }),
       }),
-    },
+    } as unknown as PosPb,
     created,
     updates,
   };