Export Audio and Export Package not working with Russian text on MacOS

Hey. Thanks for the great app. 

Unfortunately, after generation with Russian trained voice from Russian text with Qwen3-TTS the track can't be exported.

Export Audio error:

```
Failed to download audio
Load failed
```

Export Package Error:

```
Failed to export generation
'latin-1' codec can't encode characters in position 33-39: ordinal not in range(256)
```
