fix: set minimum amount for Ethereum network

[Dprof-in-tech]

Description

This pull request introduces a network-specific validation to the transaction form, ensuring users meet the minimum transaction amount for Ethereum.

Validation update for Ethereum transactions:

• In TransactionForm.tsx, a $50 USD minimum is enforced when the selected network is Ethereum.

References

WE ARE ENFORCING A $50 USD MINIMUM FOR ETHEREUM

Testing

• This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation and tests for new/changed functionality in this PR
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not main

By submitting a PR, I agree to Paycrest's Contributor Code of Conduct and Contribution Guide.

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[onahprosper]

@Dprof-in-tech if (selectedNetwork?.chain?.name === "Ethereum") and (normalizedToken === "CNGN"), this still assumes that the minimum will be 50 for CNGN and other respective local currencies.
Within this if block, let's add a check for when the selected token is CNGN

[sundayonah]

kindly check for balance first.
an address with 0$ the error message should be Insufficient balance.

[Dprof-in-tech]

kindly check for balance first. an address with 0$ the error message should be Insufficient balance.

balance check follows existing method where we check is it above the minimum transaction amount? then we check if its below your balance