feat(io): welcome banner for game start

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Semesterprojekt/src/main/java/thb/jeanluc/adventure/App.java

@@ -19,6 +19,7 @@ import thb.jeanluc.adventure.game.Game;
 import thb.jeanluc.adventure.game.GameContext;
 import thb.jeanluc.adventure.io.ConsoleIO;
 import thb.jeanluc.adventure.io.GameIO;
+import thb.jeanluc.adventure.io.text.Banner;
 import thb.jeanluc.adventure.loader.WorldLoader;
 
 /**
@@ -77,7 +78,7 @@ public final class App {
         Game game = new Game(ctx, registry, new CommandParser());
         quit.bind(game);
 
-        io.write(loaded.world().getTitle());
+        io.print(Banner.welcome(loaded.world().getTitle()));
         io.write(loaded.world().getWelcomeMessage());
         new LookCommand().execute(ctx, java.util.List.of());
 

Semesterprojekt/src/main/java/thb/jeanluc/adventure/io/text/Banner.java

@@ -0,0 +1,18 @@
+package thb.jeanluc.adventure.io.text;
+
+/** Builds styled banners for big moments (game start, finale). */
+public final class Banner {
+
+    private Banner() {
+    }
+
+    /** A framed, heading-styled welcome banner for the given title. */
+    public static StyledText welcome(String title) {
+        String bar = "=".repeat(Math.max(8, title.length() + 8));
+        return StyledText.builder()
+                .heading(bar + "\n")
+                .heading("    " + title + "\n")
+                .heading(bar)
+                .build();
+    }
+}

Semesterprojekt/src/test/java/thb/jeanluc/adventure/io/text/BannerTest.java

@@ -0,0 +1,15 @@
+package thb.jeanluc.adventure.io.text;
+
+import org.junit.jupiter.api.Test;
+import static org.assertj.core.api.Assertions.assertThat;
+
+class BannerTest {
+
+    @Test
+    void welcome_containsTitleAsHeading() {
+        StyledText b = Banner.welcome("Haunted Manor");
+        assertThat(b.plainText()).contains("Haunted Manor");
+        boolean hasHeading = b.spans().stream().anyMatch(s -> s.style() == Style.HEADING);
+        assertThat(hasHeading).isTrue();
+    }
+}