added saving

src/BeatStore.ts

@@ -20,7 +20,7 @@ export function createBeatStore() {
     const activeBeatIndex = ref(0);
     const activeBeat = computed<Beat | null>(() => beats.value[activeBeatIndex.value] ?? null);
     const autoSave = ref(true);
-    const orientation = ref<'horizontal' | 'vertical' | null>(null);
+    const orientation = ref<'horizontal' | 'vertical'>('horizontal');
 
     function resetActiveBeat(): void {
         const current = activeBeat.value;
@@ -51,7 +51,7 @@ export function createBeatStore() {
             localStorage.setItem("drum-slayer-save", JSON.stringify({
                 beats: serials,
                 activeBeatIndex: activeBeatIndex.value,
-                orientation: orientation.value,
+                orientation: orientation.value ?? 'horizontal',
             }));
         }
     }