feat: use react 19 form actions

[rmeena840]

Description

Closes: #80

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Author Checklist

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I have...

• included the correct type prefix in the PR title
• added ! to the type prefix if API or client breaking change
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• updated the relevant documentation or specification
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Summary by Sourcery

Migrate the Buy nBTC form to React 19 form actions by removing react-hook-form and adopting native form submission with useActionState, custom validation, and NumericInput components

Enhancements:

• Replace react-hook-form with React 19 form actions using useActionState for form submission
• Swap FormNumericInput for the unified NumericInput component across the form
• Move form state to useState and inline onChange handlers instead of useForm hooks
• Implement validateTransaction for client-side checks with toasts for account presence, invalid amounts, and insufficient balance
• Simplify YouReceive component by removing unnecessary props and relying on NumericInput

[sourcery-ai]

Reviewer's Guide

Refactors the BuyNBTC component to adopt React 19 form actions via useActionState, removes react-hook-form integration, replaces FormNumericInput with NumericInput, centralizes transaction validation, and streamlines form reset and the YouReceive component.

File-Level Changes

Change	Details	Files
Migrated form handling from react-hook-form to React 19 form actions	Removed useForm, FormProvider, watch, trigger, handleSubmit, reset hooks Replaced form submit handling with using useActionState Replaced handleSubmit callback signature with new handleTransaction receiving FormData	app/components/BuyNBTC/BuyNBTC.tsx
Replaced FormNumericInput with NumericInput	Swapped imports from FormNumericInput to NumericInput Updated props: added id, value binding, onChange, removed rules and createEmptySpace	app/components/BuyNBTC/BuyNBTC.tsx
Extracted and centralized transaction validation logic	Introduced validateTransaction for account, amount, and balance checks Moved toast error handling into validation function and returned validation result	app/components/BuyNBTC/BuyNBTC.tsx
Simplified form reset and local state management	Replaced react-hook-form reset with setSUIAmount and resetMutation Removed BuyNBTCForm interface and related types	app/components/BuyNBTC/BuyNBTC.tsx
Streamlined YouReceive component	Removed isSuiWalletConnected prop Simplified value and placeholder logic using calculateYouReceive	app/components/BuyNBTC/BuyNBTC.tsx

Possibly linked issues

• Use React-19 Form Actions for nBTC Buy #80: PR implements React 19 form actions and removes react-hook-form from nBTC Buy form, addressing the issue proposal.

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[sourcery-ai]

Hey @rmeena840 - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟡 General issues: 1 issue found
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Documentation: all looks good

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[sourcery-ai]

suggestion: Unused formData parameter in handler

Please remove the unused formData parameter or update the function to use formData.get('suiAmount') instead of reading from state.

[sourcery-ai]

suggestion (code-quality): Use block braces for ifs, whiles, etc. (use-braces)

Suggested change

	if (!isValid) return;
	if (!isValid) {

Explanation

It is recommended to always use braces and create explicit statement blocks.

Using the allowed syntax to just write a single statement can lead to very confusing
situations, especially where subsequently a developer might add another statement
while forgetting to add the braces (meaning that this wouldn't be included in the condition).