fix: tolerate empty NEXT_PUBLIC_APP_URL during production build

lib/ai/pipeline/generate-episode.ts

@@ -261,7 +261,7 @@ async function generateArt(episode: EpisodeWithRelations) {
 }
 
 async function notifyReady(episode: EpisodeWithRelations) {
-  const appUrl = process.env.NEXT_PUBLIC_APP_URL ?? "http://localhost:3000";
+  const appUrl = process.env.NEXT_PUBLIC_APP_URL || "http://localhost:3000";
   try {
     await sendEmail({
       to: episode.user.email,

lib/auth/auth-client.ts

@@ -4,7 +4,7 @@ import { createAuthClient } from "better-auth/react";
 import { adminClient, organizationClient } from "better-auth/client/plugins";
 
 export const authClient = createAuthClient({
-  baseURL: process.env.NEXT_PUBLIC_APP_URL ?? undefined,
+  baseURL: process.env.NEXT_PUBLIC_APP_URL || undefined,
   plugins: [adminClient(), organizationClient()],
 });
 

lib/auth/auth.ts

@@ -5,7 +5,7 @@ import { nextCookies } from "better-auth/next-js";
 import { prisma } from "@/lib/db";
 import { sendEmail, emailLayout } from "@/lib/email";
 
-const appUrl = process.env.NEXT_PUBLIC_APP_URL ?? "http://localhost:3000";
+const appUrl = process.env.NEXT_PUBLIC_APP_URL || "http://localhost:3000";
 
 const googleConfigured = !!(process.env.GOOGLE_CLIENT_ID && process.env.GOOGLE_CLIENT_SECRET);
 

lib/billing/paypal.ts

@@ -2,7 +2,7 @@ import type { PlanKey } from "./plans";
 
 const SANDBOX_BASE = "https://api-m.sandbox.paypal.com";
 const base = () => process.env.PAYPAL_API_BASE ?? SANDBOX_BASE;
-const appUrl = () => process.env.NEXT_PUBLIC_APP_URL ?? "http://localhost:3000";
+const appUrl = () => process.env.NEXT_PUBLIC_APP_URL || "http://localhost:3000";
 
 // Loudly warn (but don't throw — never break deploys) if PayPal is pointed at the
 // sandbox while running in production. The sandbox default is fine for dev.

lib/billing/stripe.ts

@@ -18,7 +18,7 @@ export function isStripeConfigured(): boolean {
   return !!process.env.STRIPE_SECRET_KEY;
 }
 
-const appUrl = () => process.env.NEXT_PUBLIC_APP_URL ?? "http://localhost:3000";
+const appUrl = () => process.env.NEXT_PUBLIC_APP_URL || "http://localhost:3000";
 
 /** Find-or-create the Stripe customer for a user and persist the id. */
 export async function ensureStripeCustomer(user: {