AmountInput enhancements

[kaloudis]

Description

This PR seeks to address issues with the AmountInput component raised in comment #2245 (comment)

• I personally find it a bit irritating when the input is pre-filled with a "0" (not as placeholder, but really the value for the text input).

This is directly addressed by this PR

• Block entering of invalid chars (anything but numbers and decimal separators should be ignored for amount inputs)

This is directly addressed by this PR

• Remove invalid chars if pasted (e.g. somebody is pasting "12 304 sats", it should result to "12304")

This is directly addressed by this PR

• Allow leading zeros but remove them internally when whatever process is continued (product saved, invoice created etc.)

This is already addressed by UnitStore's getFormattedAmount - though we can discuss how this behavior can be changed.

This pull request is categorized as a:

• New feature
• Bug fix
• Code refactor
• Configuration change
• Locales update
• Quality assurance
• Other

Checklist

• I’ve run yarn run tsc and made sure my code compiles correctly
• I’ve run yarn run lint and made sure my code didn’t contain any problematic patterns
• I’ve run yarn run prettier and made sure my code is formatted correctly
• I’ve run yarn run test and made sure all of the tests pass

Testing

If you modified or added a utility file, did you add new unit tests?

• No, I’m a fool
• Yes
• N/A

I have tested this PR on the following platforms (please specify OS version and phone model/VM):

• Android
• iOS

I have tested this PR with the following types of nodes (please specify node version and API version where appropriate):

• Embedded LND
• LND (REST)
• LND (Lightning Node Connect)
• Core Lightning (c-lightning-REST)
• LndHub
• [DEPRECATED] Core Lightning (Spark)
• [DEPRECATED] Eclair

Locales

• I’ve added new locale text that requires translations
• I’m aware that new translations should be made on the ZEUS Transfix page and not directly to this repo

Third Party Dependencies and Packages

• Contributors will need to run yarn after this PR is merged in
• 3rd party dependencies have been modified:
  • verify that package.json and yarn.lock have been properly updated
  • verify that dependencies are installed for both iOS and Android platforms

Other:

• Changes were made that require an update to the README
• Changes were made that require an update to onboarding

[myxmaster]

Very nice.

About leading zeros: It is not that relevant, but I can enter ₿ "00.05" and save the product. When I reopen it, it stays 00.05:

Would be cool if it internally converts into 0.05.

[kaloudis]

Very nice.

About leading zeros: It is not that relevant, but I can enter ₿ "00.05" and save the product. When I reopen it, it stays 00.05:

Would be cool if it internally converts into 0.05.

Let's make another issue for this as there is some more complexity here.

[kaloudis]

Very nice.

About leading zeros: It is not that relevant, but I can enter ₿ "00.05" and save the product. When I reopen it, it stays 00.05:

Would be cool if it internally converts into 0.05.

#2259