Fancy latin script characters aren't handled

Basically every character here: https://glyphy.io/cool-symbols/latin

For producing text such as ℳ𝓎 𝓃𝒶𝓂ℯ 𝒾𝓈 ℳ𝒶𝓉𝓉𝒽ℯ𝓌.

It's transliterated as a bunch of whitespace:

```
❯ node
Welcome to Node.js v22.21.1.
Type ".help" for more information.
> const tr = require("unidecode")
undefined
> tr('ℳ𝓎 𝓃𝒶𝓂ℯ 𝒾𝓈 ℳ𝒶𝓉𝓉𝒽ℯ𝓌')
' '
```

Start by reproducing the issue in the Node.js REPL with the linked Latin-script characters and inspect how the package maps them during transliteration. Done means these characters produce meaningful ASCII transliterations instead of whitespace; the payload does not name any files or tests to begin with.

Written by the indexing model from the issue text.