[enhancement]: Add a "token counter" to the prompt section to show how many tokens are about to be used

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Contact Details

_No response_

### What should this feature add?

I'd like a token counter/word counter on the prompt input box. It should show approximately how many tokens would be sent to the model on generation.

Why? It's fairly known that many models lose coherence/adherence past a certain token count. By giving the user some helpful guardrails on the prompt, they will get better results.

### Alternatives

Having to paste it into another tool is annoying, but workable.

### Additional Content

_No response_