refactor(errors): use native error causes

src/errors.ts

@@ -1,6 +1,6 @@
 export class AudioManagerError extends Error {
-    public constructor(message: string) {
-        super(message);
+    public constructor(message: string, options?: ErrorOptions) {
+        super(message, options);
         this.name = new.target.name;
     }
 }
@@ -10,10 +10,7 @@ export class AudioManagerConfigError extends AudioManagerError {}
 export class AudioManagerStateError extends AudioManagerError {}
 
 export class FfmpegProcessError extends AudioManagerError {
-    public constructor(
-        message: string,
-        public readonly cause?: unknown,
-    ) {
-        super(message);
+    public constructor(message: string, cause?: unknown) {
+        super(message, cause === undefined ? undefined : { cause });
     }
 }