Is there an existing issue for this?

• I have searched the issues (both open and closed)

Current Behavior

When tagging an account in a post or reply which contains a special character, then the highlighting of the account name in blue does not work properly.
Example would be a toot to

Hello Hello @UniKonstanz@bawü.social , ...

In this scenario, I would see "@UniKonstanz@baw" highlighted in blue, the rest of the name ("ü.social") in standard white/black font.

Expected Behavior

I would expect that the entire account name is getting highlighted in blue for better readability.

Steps To Reproduce

1. iOS app for Mastodon (version given below)
2. start writing a toot
3. reference via @ an account with a special character. Example @UniKonstanz@bawü.social

Environment

- Device: iPhone 15 pro
- OS: 18.3.1
- Version: 2024.12
- Build: 6951

Anything else?

The web client does not highlight names. Not sure if this is a general issue, or an issue with the iOS app.