fix: resolve mp3 upload error at api.ts:53 (issue #95)

[ErnestHysa]

Summary

Fixes issue #95 - mp3 upload error at api.ts:53.

Root Cause

When uploading directly to R2 via a presigned URL, the client was sending a Content-Type header in the PUT request. However, presigned URLs already encode the content type in their signature. Including the header causes R2 to reject the upload with a signature mismatch error.

Fix

Removed the explicit Content-Type header from the fetch call when uploading to the presigned URL. The content type information is already embedded in the presigned URL itself.

Changes

• apps/client/src/lib/api.ts: Removed headers: { Content-Type: data.file.type } from the presigned URL upload fetch call

Testing

This fix has been tested to resolve the mp3 upload failure.

[vercel]

@ErnestHysa is attempting to deploy a commit to the freemanjiang's projects Team on Vercel.

A member of the Team first needs to authorize it.

[ErnestHysa]

The Vercel deploy preview needs team authorization from a maintainer on freemanjiang's projects — not something I can do from my end. The code change is just the Content-Type header removal in apps/client/src/lib/api.ts; once a maintainer authorizes, the preview should run.