refactor(env): make POSTHOG_API_KEY and STRIPE_CUSTOMER_PORTAL required

- Remove .optional() from NEXT_PUBLIC_POSTHOG_API_KEY
- Remove .optional() from NEXT_PUBLIC_STRIPE_CUSTOMER_PORTAL
- Remove conditional check in usage-section.tsx since portal URL is now required
- All required vars have dummy values in .env.example

Author: brandonkachen

common/src/env-schema.ts

@@ -9,13 +9,13 @@ export const clientEnvSchema = z.object({
     .email()
     .min(1)
     .default('support@codebuff.com'),
-  NEXT_PUBLIC_POSTHOG_API_KEY: z.string().min(1).optional(),
+  NEXT_PUBLIC_POSTHOG_API_KEY: z.string().min(1),
   NEXT_PUBLIC_POSTHOG_HOST_URL: z
     .url()
     .min(1)
     .default('https://us.i.posthog.com'),
   NEXT_PUBLIC_STRIPE_PUBLISHABLE_KEY: z.string().min(1),
-  NEXT_PUBLIC_STRIPE_CUSTOMER_PORTAL: z.url().min(1).optional(),
+  NEXT_PUBLIC_STRIPE_CUSTOMER_PORTAL: z.url().min(1),
   NEXT_PUBLIC_GOOGLE_SITE_VERIFICATION_ID: z.string().optional(),
   NEXT_PUBLIC_WEB_PORT: z.coerce.number().min(1000).default(3000),
 } satisfies Record<`${typeof CLIENT_ENV_PREFIX}${string}`, any>)

web/src/app/profile/components/usage-section.tsx

@@ -83,11 +83,7 @@ const ManageCreditsCard = ({ isLoading = false }: { isLoading?: boolean }) => {
             isPurchasePending={buyCreditsMutation.isPending}
             showAutoTopup={true}
             isLoading={isLoading}
-            billingPortalUrl={
-              env.NEXT_PUBLIC_STRIPE_CUSTOMER_PORTAL
-                ? `${env.NEXT_PUBLIC_STRIPE_CUSTOMER_PORTAL}?prefilled_email=${email}`
-                : undefined
-            }
+            billingPortalUrl={`${env.NEXT_PUBLIC_STRIPE_CUSTOMER_PORTAL}?prefilled_email=${email}`}
           />
         </div>
       </CardContent>