fix(api): suppress send_email() in test/Playwright environments

Add a guard at the top of send_email() that checks globalThis.__ae_test_mode.
If truthy, logs a suppression message and returns null immediately so no HTTP
request is made. This prevents real emails being sent when Playwright tests
exercise components that call send_staff_notification_email() after a successful
save. Activate by setting window.__ae_test_mode = true in addInitScript.

src/lib/api/api.ts

@@ -605,6 +605,13 @@ export const send_email = async function send_email({
 }) {
     console.log('*** send_email() ***');
 
+    // Skip email sending entirely when running in a test/Playwright environment.
+    // Set window.__ae_test_mode = true via addInitScript to activate this guard.
+    if (typeof globalThis !== 'undefined' && (globalThis as any).__ae_test_mode) {
+        console.log(`[TEST MODE] send_email() suppressed — would have sent to: ${to_email}, subject: ${subject}`);
+        return null;
+    }
+
     const endpoint = `/util/email/send`;
 
     data['from_email'] = from_email; // Required