fixed display issue in maine scene

master_login.json

+[{"platform":"master","username":"seannykimmy","password":"3UiVsXvyL/GzCjCt27PI0w==:tGQegCz6swKnt+o1mRxqvw==:jAbH5YDHI5dxEBiispkK9elrJi85s+fobTGvxvQlIQ8="}]
\ No newline at end of file

src/main/java/com/cpsc329pm/MainPageController.java

@@ -18,6 +18,15 @@ public class MainPageController {
     @FXML
     private Label currUsername;
 
+    @FXML
+    public void initialize() {
+        // Set the username when the scene initializes
+        String username = UserSession.getUsername();
+        if (username != null && currUsername != null) {
+            currUsername.setText(username);
+        }
+    }
+
     public void setCurrUsername(String username) {
         if (currUsername != null) {
             currUsername.setText(username);