Update embedded sendspin-js to @sendspin/sendspin-js@2.0.2 (#157)

## Summary
- Update embedded web player SDK import from
`@music-assistant/sendspin-js@1.0` to `@sendspin/sendspin-js@2.0.2`.

## sendspin-js release notes
- Releases: https://github.com/Sendspin/sendspin-js/releases
- Current (2.0.2):
https://github.com/Sendspin/sendspin-js/releases/tag/2.0.2
- Previous 1.0 line (1.0.1):
https://github.com/Sendspin/sendspin-js/releases/tag/1.0.1

## Diff
- Sendspin/sendspin-js@1.0.1...2.0.2

Author: balloob

sendspin/serve/web/app.js

@@ -129,7 +129,7 @@ elements.volumeSlider.addEventListener("input", () => {
 });
 
 const sdkImport = import(
-  "https://unpkg.com/@music-assistant/sendspin-js@1.0/dist/index.js"
+  "https://unpkg.com/@sendspin/sendspin-js@2.0.2/dist/index.js"
 );
 
 // QR Code generation (using qrcode-generator loaded via script tag)