feat: enhance send tx popup

[Tuditi]

Summary

Added ethereum address validation as well as some UI fixes when switching between send NFT & send Token tab.

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Changelog

- validate ethereum addresses
- correctly add network options depending whether NFT/Token transaction
- correctly reset fields

Relevant Issues

closes: #4850
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Testing

Platforms

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• Desktop
  • MacOS
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  • Windows
• Mobile
  • iOS
  • Android

Instructions

Please describe the specific instructions, configurations, and/or test cases necessary to test and verify that your changes work as intended.

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Checklist

Please tick all of the following boxes that are relevant to your changes.

• I have followed the contribution guidelines for this project
• 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
• I have verified that new and existing unit tests pass locally with my changes
• I have verified that my latest changes pass CI workflows for testing and linting
• I have made corresponding changes to the documentation

[MarkNerdi996]

Works nicely, added some comments/questions.

[MarkNerdi996]

LGTM!