Add an enter button to the command UI

[Femimat]

Contributor checklist

• This pull request is on a separate branch and not the main branch
• I have tested my code with the just command as directed in the testing section of the contributing guide

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Description

• Added a CommandKind state for Translate, Conjugate, and Plural.
• Selecting a command now records the active command and gives that button a selected visual state.
• The input placeholder changes per command.
• An Enter button appears to the right of the text input only after one of those commands is selected.
• Added ExecuteCommand handling as the hook for future real command execution.
• Added tests for command selection and keyboard capture behavior.

Related issue

• Closes Add an enter button to the command UI #36

[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)

[andrewtavis]

praise: All's looking great here, @Femimat! Thanks for your efforts to finish this up :)

note: I'll make another issue to take a look at some minor details about the UI. Feel free to pick it up!