btoa base64 encoding is removed in thumbnail route#386
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Summary
The thumbnail routes were broken in production. The
btoa(String.fromCharCode(...new Uint8Array(buf)))converts the image binary to abase64string, but sincecontent-typeisimage/jpeg, the browser tries to interpret that base64 text as raw image bytes and renders garbage. Passingbuf(the ArrayBuffer) directly sends the actual binary data the browser expects.