refactor: save entire data structure on submission

[iamacook]

What it solves

This updates the nextStep function to require the entire data structure to be set on submission.

Other small changes

• Only renders current step
• Adds back button (yet to be styled)
• Closes modal when signing

How to test it

Open the transaction creation flow and click next, observing the data present in the second step. Clicking back should also retain the values on the first step.

Checklist

• I've tested the branch on mobile 📱
• I've documented how it affects the analytics (if at all) 📊
• I've written a unit/e2e test for it (if applicable) 🧑‍💻

[github-actions]

Branch preview

✅ Deploy successful!

https://refactor_stepper--walletweb.review-wallet-web.5afe.dev

[github-actions]

ESLint Summary View Full Report

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Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

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^{Report generated by eslint-plus-action}

[katspaugh]

👍