Add SMTP test email button and recipient field on settings page

app.py

@@ -806,6 +806,20 @@ def admin_settings():
             flash('Email (SMTP) settings saved. Password stored encrypted.', 'success')
             return redirect(url_for('admin_settings'))
 
+        elif action == 'send_test_email':
+            # Send a test email to the address provided in the form.
+            test_to = request.form.get('test_email_address', '').strip()
+            if not test_to:
+                flash('Enter a test email address first.', 'error')
+                return redirect(url_for('admin_settings'))
+            try:
+                body = "Hi,\n\nThis is a test email from the Trollgorithm Theme Song Booth. If you're seeing this, SMTP is configured correctly."
+                send_email(test_to, 'SMTP Test from Theme Song Booth', body, inline_images=build_signature_images())
+                flash(f'Test email sent to {test_to}.', 'success')
+            except Exception as e:
+                flash(f'Failed to send test email: {e}', 'error')
+            return redirect(url_for('admin_settings'))
+
         elif action == 'save_refresh':
             # Update dashboard auto-refresh interval.
             val = request.form.get('refresh_seconds', '10').strip()

templates/admin/settings.html

@@ -266,6 +266,16 @@
           </table>
           <button type="submit">Save Email Settings</button>
         </form>
+
+        <hr style="border:none;border-top:1px solid var(--border);margin:1.5rem 0;">
+
+        <h3>Send Test Email</h3>
+        <form method="POST">
+          <input type="hidden" name="action" value="send_test_email">
+          <label for="test_email_address">Test recipient address</label>
+          <input type="email" id="test_email_address" name="test_email_address" placeholder="you@example.com" required>
+          <button type="submit">Send Test Email</button>
+        </form>
       </div>
 
       <!-- MP3 metadata defaults -->