Support for big5

### Expected Behavior

The response decode does not support big5, so it displays garbled text.

### Actual Behavior

```

�T�j�k�H�R��W | V1:��� V2:�~��R�i�Ѽ�, V3:�~���X�Ѽ�, V4:��H�R�i�Ѽ�, V5:��H��X�Ѽ�, V6:����ӶR�i�Ѽ�, V7:����ӽ�X�Ѽ�, V8:LotSize, V9:����Ӧۦ�R��R�i�Ѽ�, V10:����Ӧۦ�R���X�Ѽ�, V11:��������I�R�i�Ѽ�, V12:��������I��X�Ѽ�: �T�j�k�H�R��W

```

### Reproduction Steps

_No response_

### Is there an existing issue for this?

- [X] I have searched the [issue tracker](https://www.github.com/Kong/insomnia/issues) for this problem.

### Additional Information

_No response_

### Insomnia Version

v9.1.1

### What operating system are you using?

macOS

### Operating System Version

MacOS Sonoma

### Installation method

Download from Insomnia

### Last Known Working Insomnia version

_No response_

The issue does not identify an implementation file, test, or response-decoding entry point. Start by locating where Insomnia decodes HTTP response bodies and how character encodings are selected; reproduce the garbled Big5 response, then add coverage showing that Big5 text is decoded correctly.

Written by the indexing model from the issue text.