Feat: Reuse shared ClientService in CasinomainuiController

Make the controller use ClientApp.getSharedClientService() if available; otherwise fall back to creating a new ClientService. Add/cleanup Javadoc.

src/main/java/ch/unibas/dmi/dbis/cs108/casono/client/ui/lobbyui/CasinomainuiController.java

@@ -1,5 +1,6 @@
 package ch.unibas.dmi.dbis.cs108.casono.client.ui.lobbyui;
 
+import ch.unibas.dmi.dbis.cs108.casono.client.ClientApp;
 import ch.unibas.dmi.dbis.cs108.casono.client.network.ClientService;
 import ch.unibas.dmi.dbis.cs108.casono.client.network.LobbyClient;
 import javafx.application.Platform;
@@ -36,12 +37,16 @@ public class CasinomainuiController {
     private int nextButtonId = 1;
     private LobbyClient lobbyClient;
 
-    /** Default constructor for dependency injection by FXMLLoader. */
+    /** Default constructor used by FXMLLoader. */
     public CasinomainuiController() {
         // Default constructor
     }
 
-    /** Initializes the UI components and sets default values. */
+    /**
+     * Initializes the UI components and sets default values. If a shared {@link
+     * ch.unibas.dmi.dbis.cs108.casono.client.network.ClientService} exists (created at application
+     * start), the controller reuses it so the connection remains open and already-logged-in.
+     */
     @FXML
     public void initialize() {
         titleLabel.setText("Casono");
@@ -51,7 +56,8 @@ public class CasinomainuiController {
         translationManager = LobbyButtonTranslationManager.getInstance();
         String host = System.getProperty("casono.server.host");
         int port = Integer.parseInt(System.getProperty("casono.server.port"));
-        ClientService clientService;
+        ClientService clientService = ClientApp.getSharedClientService();
+        if (clientService == null) {
             try {
                 clientService = new ClientService(host, port);
             } catch (RuntimeException e) {
@@ -62,6 +68,7 @@ public class CasinomainuiController {
                         e.getMessage());
                 clientService = new ClientService(true); // offline mode
             }
+        }
         gridManager =
                 new LobbyButtonGridManager(
                         new javafx.scene.layout.GridPane(), translationManager, clientService);
@@ -117,7 +124,11 @@ public class CasinomainuiController {
         Platform.exit();
     }
 
-    /** Handles creation of a new lobby button. */
+    /**
+     * Handles creation of a new lobby button. Attempts to create a lobby on the server via the
+     * {@link LobbyButtonGridManager} and registers the new button in the local translation manager.
+     * Errors are logged and displayed as an informational alert.
+     */
     @FXML
     public void handleCreateLobbyButton() {
         if (translationManager.isFull()) {