fix: BASE_URL fuer Musik und Highscore (404 auf GitHub Pages)

Absolute Pfade (/music/..., /HIGHSCORE.md) funktionierten nicht unter
dem /halma/ Subpath. Jetzt wird import.meta.env.BASE_URL verwendet.

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

Author: michaelblaess

src/audio/music.ts

@@ -1,10 +1,11 @@
 // Background music player — shuffled playlist, loops forever
 
 // Hashed filenames — Mapping siehe scripts/decrypt-music.sh
+const BASE = import.meta.env.BASE_URL;
 const TRACKS = [
-  '/music/1e6b41f0261e.mp3',
-  '/music/9685818f508c.mp3',
-  '/music/a07b560519d9.mp3',
+  `${BASE}music/1e6b41f0261e.mp3`,
+  `${BASE}music/9685818f508c.mp3`,
+  `${BASE}music/a07b560519d9.mp3`,
 ];
 
 let audio: HTMLAudioElement | null = null;

src/components/GameInfo.tsx

@@ -57,7 +57,7 @@ const HighscoreOverlay: React.FC<{ onClose: () => void }> = ({ onClose }) => {
   const panelRef = useFocusTrap(onClose);
 
   React.useEffect(() => {
-    fetch('/HIGHSCORE.md')
+    fetch(`${import.meta.env.BASE_URL}HIGHSCORE.md`)
       .then((res) => {
         if (!res.ok) throw new Error('Not found');
         return res.text();