fix: add stream duplex handling to uploadToSignedUrl

The raw-body path in uploadToSignedUrl was missing the stream detection
and duplex: 'half' propagation that uploadOrUpdate already has. Without
this, passing a ReadableStream or Node.js stream to uploadToSignedUrl
fails on Node 20+ fetch which requires duplex: 'half' for stream bodies.

Mirrors the exact pattern from uploadOrUpdate (lines 121-142) into
uploadToSignedUrl for consistency.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: MaxwellCalkin

packages/core/storage-js/src/packages/StorageFileApi.ts

@@ -287,13 +287,26 @@ export default class StorageFileApi extends BaseApiClient<StorageError> {
         if (metadata) {
           headers['x-metadata'] = this.toBase64(this.encodeMetadata(metadata))
         }
+
+        // Node.js streams require duplex option for fetch in Node 20+
+        // Check for both web ReadableStream and Node.js streams
+        const isStream =
+          (typeof ReadableStream !== 'undefined' && body instanceof ReadableStream) ||
+          (body && typeof body === 'object' && 'pipe' in body && typeof body.pipe === 'function')
+
+        if (isStream && !options.duplex) {
+          options.duplex = 'half'
+        }
       }
 
       if (fileOptions?.headers) {
         headers = { ...headers, ...fileOptions.headers }
       }
 
-      const data = await put(this.fetch, url.toString(), body as object, { headers })
+      const data = await put(this.fetch, url.toString(), body as object, {
+        headers,
+        ...(options?.duplex ? { duplex: options.duplex } : {}),
+      })
 
       return { path: cleanPath, fullPath: data.Key }
     })