feat(io): travelStep hook for animated auto-walk (console no-op, Swing override)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Semesterprojekt/src/main/java/thb/jeanluc/adventure/io/GameIO.java

@@ -44,6 +44,17 @@ public interface GameIO {
         // no-op
     }
 
+    /**
+     * One frame of an auto-walk (the {@code go to} command), as the player moves
+     * through a room en route. Default is a no-op: text mode travels silently.
+     * The GUI overrides this to repaint the map and pace the animation.
+     *
+     * @param view the map snapshot at this step
+     */
+    default void travelStep(MapView view) {
+        // no animation in text mode
+    }
+
     /** On-demand map (the 'map' command). Default renders ASCII (Unicode frames). */
     default void showMap(MapView view) {
         print(AsciiMap.render(view, true));

Semesterprojekt/src/main/java/thb/jeanluc/adventure/io/SwingIO.java

@@ -66,6 +66,9 @@ public class SwingIO implements GameIO {
     /** Unscaled size for the HUD and side-panel font, in points. */
     private static final float SMALL_SIZE = 12.5f;
 
+    /** Delay between rooms while animating a go-to auto-walk, in milliseconds. */
+    private static final long TRAVEL_STEP_MS = 300L;
+
     /** Side-panel width as a fraction of the window width, clamped by the bounds below. */
     private static final double SIDE_RATIO = 0.28;
     private static final int SIDE_MIN = 180;
@@ -335,6 +338,16 @@ public class SwingIO implements GameIO {
         map.show(view);
     }
 
+    @Override
+    public void travelStep(MapView view) {
+        setMap(view);
+        try {
+            Thread.sleep(TRAVEL_STEP_MS);
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+        }
+    }
+
     @Override
     public void setQuests(QuestView view) {
         quests.show(view);

Semesterprojekt/src/test/java/thb/jeanluc/adventure/io/TravelStepDefaultTest.java

@@ -0,0 +1,19 @@
+package thb.jeanluc.adventure.io;
+
+import org.junit.jupiter.api.Test;
+import thb.jeanluc.adventure.io.text.MapView;
+
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class TravelStepDefaultTest {
+
+    @Test
+    void defaultTravelStepIsSilentNoOp() {
+        TestIO io = new TestIO();
+        // An empty map view is fine; the default must not print or throw.
+        io.travelStep(new MapView(List.of(), List.of()));
+        assertThat(io.outputs()).isEmpty();
+    }
+}