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

Platforms

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• Desktop
  • [ ] MacOS
  • [x] Linux
  • [x] Windows

Checklist

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• [x] I have followed the contribution guidelines for this project
• [x] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have added or modified tests that prove my changes work as intended
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