feat: add validate input on blur

[ntsd]

before the input validation on submit.

This PR makes it validate on input blur, I have tried the on:change event but after focusing on the input again the error is gone and if the input didn't change it does not trigger validate again.

Summary

Validate input on blur instead of on submit

Changelog

- Add validation on amount and recipient input

Testing

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[marc2332]

The idea is great, but I find the way you propagate upwards the blur event is somewhat hard to understand why it's there unless you see the big picture, is there maybe a better way to do this?