Allow Unicode characters including emojis in nicknames

[JamesTsetsekas]

🌍 Allow Unicode characters including emojis in nicknames
This update removes the restrictive alphanumeric-only validation for nicknames and replaces it with Unicode-friendly validation that allows emojis and international characters while still preventing potentially harmful control characters.

Changes:

Replaced isalnum() check with control character filtering
Users can now use emojis like 🟧Python, 🚀Alice, or international names like José, محمد
Still blocks control characters (\n, \r, \t, \0) for security
Maintains existing length limits and reserved name restrictions

Example usage:

> /name 🟧Python
» Nickname changed to: 🟧Python

This makes BitChat more inclusive and expressive while maintaining security standards! 🎉

[o-murphy]

@JamesTsetsekas Does it is supported by original API?

[JamesTsetsekas]

tbh im not sure, i just noticed on my android client i was able to put emojis in my name and wanted similar functionality in this project.

[o-murphy]

tbh im not sure, i just noticed on my android client i was able to put emojis in my name and wanted similar functionality in this project.

current problem is new noise protocol not supported by android app

[o-murphy]

@JamesTsetsekas can I add this changes it to #7?

[JamesTsetsekas]

@JamesTsetsekas can I add this changes it to #7?

Sure