feat(tip): support tiered coffee gifts

src/app/tip/tip-screen.helpers.ts

@@ -1,27 +1,37 @@
 import type { LoginStatus } from "@/data/dto/auth";
 import type { PaymentPlan } from "@/data/dto/payment";
-
-const TIP_COFFEE_PLAN_ID = "tip_coffee";
-const TIP_COFFEE_ORDER_TYPE = "tip_coffee";
+import {
+  getTipCoffeeOption,
+  type TipCoffeeType,
+} from "@/lib/tip/tip_coffee";
 
 export function findTipCoffeePlan(
   plans: readonly PaymentPlan[],
+  coffeeType: TipCoffeeType,
 ): PaymentPlan | null {
+  const option = getTipCoffeeOption(coffeeType);
+
   return (
-    plans.find((plan) => plan.planId === TIP_COFFEE_PLAN_ID) ??
-    plans.find((plan) => plan.orderType === TIP_COFFEE_ORDER_TYPE) ??
+    plans.find((plan) => plan.planId === option.planId) ??
+    (coffeeType === "small"
+      ? (plans.find((plan) => plan.planId === "tip_coffee") ?? null)
+      : null) ??
     null
   );
 }
 
-export function formatTipPrice(plan: PaymentPlan | null): string {
-  if (!plan) return "US$ 5";
+export function formatTipPrice(
+  plan: PaymentPlan | null,
+  coffeeType: TipCoffeeType,
+): string {
+  const option = getTipCoffeeOption(coffeeType);
+  const amountCents = plan?.amountCents ?? option.amountCents;
+  const currency = plan?.currency.trim().toUpperCase() || "USD";
 
-  const amount = plan.amountCents / 100;
+  const amount = amountCents / 100;
   const formattedAmount = Number.isInteger(amount)
     ? String(amount)
     : amount.toFixed(2).replace(/\.?0+$/, "");
-  const currency = plan.currency.trim().toUpperCase();
 
   if (currency === "USD") return `US$ ${formattedAmount}`;
   if (currency.length > 0) return `${currency} ${formattedAmount}`;