feat(typescript): handle binary responses with ArrayBuffer

Previously, binary responses were processed with response.text(), which
corrupts bytes > 127 due to UTF-8 encoding issues.

Now the SDK detects binary content types and uses response.arrayBuffer()
to preserve byte integrity for:
- application/octet-stream
- image/*
- audio/*
- video/*

Author: santiagomed

xdk-gen/templates/typescript/main_client.j2

@@ -421,6 +421,14 @@ export class Client {
         const rawData = await response.json();
         // Transform snake_case keys to camelCase to match TypeScript conventions
         data = transformKeys<T>(rawData);
+      } else if (contentType && (
+        contentType.includes('application/octet-stream') ||
+        contentType.includes('image/') ||
+        contentType.includes('audio/') ||
+        contentType.includes('video/')
+      )) {
+        // Return ArrayBuffer for binary content types to preserve byte integrity
+        data = await response.arrayBuffer() as T;
       } else {
         data = await response.text() as T;
       }