update when email isnt available

src/main/resources/static/index.html

@@ -710,7 +710,7 @@
 
         function updateUserDisplay() {
             document.getElementById('currentUsername').textContent = currentUser.username;
-            document.getElementById('currentEmail').textContent = currentUser.email || 'Not set';
+            document.getElementById('currentEmail').textContent = currentUser.email || '-';
             document.getElementById('currentUserId').textContent = maskUserId(currentUser.id);
             document.getElementById('currentRoles').textContent = currentUser.roles.join(', ');