Add support for OpenSubsonic enhanced lyrics (#2208)

src/renderer/utils/utf8-byte-slice.ts

@@ -0,0 +1,14 @@
+const textEncoder = new TextEncoder();
+const textDecoder = new TextDecoder();
+
+export const sliceUtf8Bytes = (value: string, byteStart: number, byteEnd: number): string => {
+    const bytes = textEncoder.encode(value);
+    const start = Math.max(0, byteStart);
+    const end = Math.min(bytes.length - 1, byteEnd);
+
+    if (start > end || bytes.length === 0) {
+        return '';
+    }
+
+    return textDecoder.decode(bytes.slice(start, end + 1));
+};