fix(virtualstream): support reconstituting smartjson encoded binary stream chunks

ts/classes.virtualstream.ts

@@ -168,6 +168,15 @@ export class VirtualStream<T = Uint8Array> implements plugins.typedRequestInterf
       return data;
     }
     if (typeof data === 'object') {
+      // Handle @push.rocks/smartjson encoded binary data.
+      if (data.type === 'EncodedBuffer' && typeof data.data === 'string' && data.data.startsWith('base64:')) {
+        const base64Data = data.data.slice('base64:'.length);
+        if (typeof Buffer !== 'undefined') {
+          const buffer = Buffer.from(base64Data, 'base64');
+          return new Uint8Array(buffer.buffer, buffer.byteOffset, buffer.byteLength);
+        }
+        return new Uint8Array(Array.from(atob(base64Data)).map((char) => char.charCodeAt(0)));
+      }
       // Handle JSON-serialized Node.js Buffer: {type: "Buffer", data: [...]}
       if (data.type === 'Buffer' && Array.isArray(data.data)) {
         return new Uint8Array(data.data);