feat-mobile: add fiat value to send amount

[begonaalvarezd]

Summary

Please summarize your changes, describing what they are and why they were made.

Add fiat value to send amount

Please note that the design of the input itself needs to be improved because based on the size of the input value, the text is not centered, need to discuss with UX/UI

Changelog

feat-mobile: add fiat value to send amount

Relevant Issues

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Close #5103

Testing

Platforms

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

Instructions

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...

Checklist

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• 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