Telegram features UI implemented.

src/main/java/org/to/telegramfinalproject/UI/TelegramFeaturesController.java

@@ -0,0 +1,42 @@
+package org.to.telegramfinalproject.UI;
+
+import javafx.application.Platform;
+import javafx.fxml.FXML;
+import javafx.scene.control.ScrollPane;
+import javafx.scene.input.MouseEvent;
+import javafx.scene.layout.BorderPane;
+import javafx.scene.layout.Pane;
+import javafx.scene.layout.StackPane;
+
+public class TelegramFeaturesController {
+
+    @FXML private Pane overlayBackground;
+    @FXML private ScrollPane featureScroll;
+    @FXML private StackPane rootOverlay;
+    @FXML private BorderPane contentCard;
+
+    @FXML
+    public void initialize() {
+        // Clicking background closes overlay
+        overlayBackground.setOnMouseClicked( e -> {
+            MainController.getInstance().closeOverlay(rootOverlay);
+        });
+
+        // Smooth scroll feel
+        featureScroll.getStylesheets().add(getClass().getResource("/org/to/telegramfinalproject/CSS/scrollpane.css").toExternalForm());
+        featureScroll.setPannable(true);
+        featureScroll.setFitToWidth(true);
+        featureScroll.setFitToHeight(false);
+        featureScroll.getContent().setOnScroll(event -> {
+            double deltaY = event.getDeltaY() * 0.003;
+            featureScroll.setVvalue(featureScroll.getVvalue() - deltaY);
+        });
+
+        // Register scene for ThemeManager → stylesheet swap will handle colors/icons
+        Platform.runLater(() -> {
+            if (contentCard.getScene() != null) {
+                ThemeManager.getInstance().registerScene(contentCard.getScene());
+            }
+        });
+    }
+}