feat: implement secure email change workflow with verification token and event handling

src/email/email.listener.ts

@@ -99,4 +99,26 @@ export class EmailListener {
       this.logger.error(`Failed to send welcome email to ${payload.email}:`, error);
     }
   }
+
+  @OnEvent('user.email-change-requested')
+  async handleEmailChangeRequested(payload: {
+    newEmail: string;
+    token: string;
+    name?: string;
+  }) {
+    this.logger.log(`Email change requested for: ${payload.newEmail}`);
+    try {
+      await this.emailService.sendVerificationEmail(
+        payload.newEmail,
+        payload.token,
+        payload.name,
+      );
+      this.logger.log(`Email-change verification sent to: ${payload.newEmail}`);
+    } catch (error) {
+      this.logger.error(
+        `Failed to send email-change verification to ${payload.newEmail}:`,
+        error,
+      );
+    }
+  }
 }