Refactor scene settings parsing using dedicated record extraction.

src/lib/parsers.ts

@@ -624,12 +624,13 @@ export function collectScenesSettings(files: TarFile[]): ScenesSettings {
     return defaultScenesSettings;
   }
 
-  const numerator = scenesSettingsFile.data[11];
-  const denominator = scenesSettingsFile.data[12];
+  const sceneRecord = collectSceneRecords(scenesSettingsFile.data)[0];
+  if (!sceneRecord) {
+    return defaultScenesSettings;
+  }
 
   return {
-    ...defaultScenesSettings,
-    timeSignature: { numerator, denominator },
+    timeSignature: sceneRecord.timeSignature,
   };
 }