Add invalid state to UIInputText

Add a `invalid` state on UIInputText to indicate a invalid input.

For now the state should be set from the outside.


Something like this:

<img width="187" alt="Image" src="https://github.com/user-attachments/assets/c4a48ade-5118-4d6c-b201-37807a1d4de9" />



__Notes__

- requires UIInputText to get basic style support.
- tracks features of an old issues: #1255 and #1966