fix: avoid crash when changing tab in send asset popup

[VmMad]

Summary

Fixes #7340

Fix bug in send asset popup to avoid crashes in releases.
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Changelog

- Fix types in `getNftByIdFromAllAccountNfts` and `NftInput` component
- Only set "selected nft" if the nft exists

Testing

Platforms

Please select any platforms where your changes have been tested.

• Desktop
  • MacOS
  • Linux
  • Windows

Instructions

• Click send asset
• Switch to "Send nft"
• In NFT Id, insert a random string (or your own address for example)
• Switch to "Send token" tab
• Switch to "Send nft" tab again. No crash should happen now.

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Checklist

Please tick 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

[marc2332]

Works ⚡

[begonaalvarezd]

It does not work properly, if you switch tabs and there was a selected NFT, it should select it again when you get back to the tab, and now it doesnt.
There is a reactivity issue in this implementation and its because before selected was initialized directly calling getNftByIdFromAllAccountNfts which always retuned an NFT if the id was right, but now selected depends on selectedNftById which gets filled reactively, so very likely if nftId had a value when the component mounts, selected will not see it