- Rename `TextField` -> `SingleLineInput`
- Add a component preview for `SingleLineInput`
- Apply `SingleLineInput` to the AddContextServerModal

Release Notes:

- N/A

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Co-authored-by: Agus Zubiaga <hi@aguz.me>
Co-authored-by: Danilo Leal <daniloleal09@gmail.com>
Co-authored-by: Danilo Leal <67129314+danilo-leal@users.noreply.github.com>