Email a set-password link when an admin creates a user

src/lib/server/registration-email.ts

@@ -0,0 +1,26 @@
+import { env } from '$env/dynamic/private';
+import { sendMail } from './resend';
+
+/**
+ * Send the "finish your registration" email to a user created by an admin.
+ *
+ * The link points at Better Auth's reset-password callback, which redirects to
+ * `/reset-password?invite=1&token=...`. There the user sets a password, then
+ * logs in and is sent to `/profile/setup` to complete their profile.
+ *
+ * Uses a Resend-hosted template (`registration-email` by default, or
+ * `RESEND_REGISTRATION_TEMPLATE_ID`) with variables:
+ *   - `target_email_address`
+ *   - `registration_link`
+ */
+export async function sendRegistrationEmail(options: { email: string; url: string }) {
+	await sendMail({
+		to: options.email,
+		subject: 'Welcome to Radiant Wave — set your password',
+		templateId: env.RESEND_REGISTRATION_TEMPLATE_ID || 'registration-email',
+		data: {
+			target_email_address: options.email,
+			registration_link: options.url
+		}
+	});
+}