feat(subscription): separate selection from payment and add issue feedback

(cherry picked from commit fe9d31146b)

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

@@ -105,6 +105,30 @@ export function findSelectedSubscriptionPlan(input: {
   return plans.find((plan) => plan.id === input.selectedPlanId) ?? null;
 }
 
+export function requiresVipPlanConfirmation(input: {
+  planId: string;
+  vipPlans: readonly VipOfferPlanView[];
+  confirmedVipPlanIds: ReadonlySet<string>;
+}): boolean {
+  return (
+    input.vipPlans.some((plan) => plan.id === input.planId) &&
+    !input.confirmedVipPlanIds.has(input.planId)
+  );
+}
+
+export function canCheckoutSubscriptionPlan(input: {
+  selectedPlanId: string;
+  vipPlans: readonly VipOfferPlanView[];
+  confirmedVipPlanIds: ReadonlySet<string>;
+}): boolean {
+  if (!input.selectedPlanId) return false;
+  return !requiresVipPlanConfirmation({
+    planId: input.selectedPlanId,
+    vipPlans: input.vipPlans,
+    confirmedVipPlanIds: input.confirmedVipPlanIds,
+  });
+}
+
 export function getDefaultSubscriptionPlanId(input: {
   canSubscribeVip: boolean;
   selectedPlanId: string;