Page freezes on clicking Start in stream wasm demo (Windows) + `libstream.worker.js` file missing

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### Bug: Page freezes on clicking Start in stream wasm demo (Windows) + `libstream.worker.js` file missing

Hi, I tried to follow the instructions in the `stream wasm` section of the `whisper.cpp` README to run real-time transcription in the browser, but encountered some problems.

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###  Problem Description

After compiling and running the browser demo as instructed, the page completely freezes after clicking the **Start** button. A few seconds later, the browser shows a message like:

> *"This page isn't responding. Do you want to wait or close it?"*

When inspecting the console via F12, I found the following error related to `stream.js`:

Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'buffer')

A screenshot of the error is attached below:

![Image](https://github.com/user-attachments/assets/d28793ff-d2f2-4a86-917b-cb08d3257462)

![Image](https://github.com/user-attachments/assets/8147c756-fa12-4d99-bc75-6674f683d9be)

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### Missing File: `libstream.worker.js`

In the README, it says:

> *"To run the example in a different server, you need to copy the following files to the server's HTTP path:"*

However, I couldn’t find `libstream.worker.js` anywhere in the build output. I’m not sure if it should have been auto-generated, manually created, or if I'm missing a build step.

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### Build Environment

* **OS**: Windows 11
* **Browser**: Edge
* **Build Steps**:

      git clone https://github.com/ggerganov/whisper.cpp
      cd whisper.cpp
      mkdir build-em && cd build-em
      emcmake cmake ..
      ninja -j 8

* **Missing File**: `libstream.worker.js`

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### Questions

1. What could be the cause of the `Emval.toHandle(handle[key])` error? 
2. Should `libstream.worker.js` be automatically generated during the build process? If not, where can I find or how can I create it?

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Thank you in advance for your help and for this amazing project! 🙏
Let me know if more logs or system info are needed — I’d be happy to provide them.

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