fix: support international keyboard characters

[Mounil2005]

Summary

• Removes the hardcoded allowed_keys() whitelist in lib.rs that only worked for English QWERTY layouts
• listener.rs now uses rdev's event.name field so the OS handles keyboard layout and Shift state — enabling å, ä, ö, ü, ß, and any other Unicode character
• Updates the listener→GUI TCP protocol from single-byte to length-prefixed UTF-8 to support multi-byte characters
• Adds a unicode_characters_captured test to gui.rs

Closes #18
Closes #37

Test plan

• Build passes: cd scribe && cargo build
• Tests pass: cd scribe && cargo test
• Manually type Swedish characters (å, ä, ö) into the command input and verify they appear
• Verify Backspace still works correctly
• Verify standard ASCII characters (a-z, 0-9, punctuation) still work

[github-actions]

Thank you for the pull request! 💙🩵

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[github-actions]

Maintainer Checklist

The following is a checklist for maintainers to make sure this process goes as well as possible. Feel free to address the points below yourself in further commits if you realize that actions are needed :)

• The CHANGELOG has been updated with a description of the changes for the upcoming release and the corresponding issue (if necessary)

[github-actions]

First PR Commit Check

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[andrewtavis]

This is a major shift on how we'll be doing things, so it'd be great to get feedback here, @henrikth93 and @RyanPaulGannon! From there we can discuss what other issues need to be made/prioritized 😊

[andrewtavis]

For now, @Mounil2005, can you fix the formatting as detailed by the failing check?

[Mounil2005]

For now, @Mounil2005, can you fix the formatting as detailed by the failing check?

Yes! On it!

[Mounil2005]

This is a major shift on how we'll be doing things, so it'd be great to get feedback here, @henrikth93 and @RyanPaulGannon! From there we can discuss what other issues need to be made/prioritized 😊

Sure, pls let me know the feedback! @henrikth93 @RyanPaulGannon

[henrikth93]

This looks good to me. One thing I am thinking of is the keystrokes, usually I write ü using ¨ + u, but in the desktop prompt I had to use the opt key, opt + u = ü. That is something we can work on in the future.

[henrikth93]

Looks good to me.

[Mounil2005]

Thanks for the review! Agreed on the dead key / compose key behavior, that's a separate concern around how the OS handles multi-keystroke character composition and is worth a follow up. If you'd like, I can open a new issue for it and work on it separately!

[henrikth93]

Thanks for the review! Agreed on the dead key / compose key behavior, that's a separate concern around how the OS handles multi-keystroke character composition and is worth a follow up. If you'd like, I can open a new issue for it and work on it separately!

That sounds good to me! Really appreciated!

[andrewtavis]

praise: This is great, @Mounil2005! Thanks for your efforts here :) I'll write into another issue to see if you want to support 😊

[andrewtavis]

And thanks also for the review, @henrikth93! 😊

[Mounil2005]

praise: This is great, @Mounil2005! Thanks for your efforts here :) I'll write into another issue to see if you want to support 😊

Yes sure! Thanks!