fix: APP-406 email always required when buying with credit card

[blushi]

Description

https://regennetwork.atlassian.net/browse/APP-406

---

Author Checklist

All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.

I have...

• provided a link to the relevant issue or specification
• provided instructions on how to test
• reviewed "Files changed" and left comments if necessary
• confirmed all CI checks have passed

How to test

From https://deploy-preview-2580--regen-marketplace.netlify.app/project/mai-ndombe-4/buy
log in with a web3 account but choose to buy with credit card
Email field on the "Payment info" step should be required.

Reviewers Checklist

All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.

I have...

• confirmed all author checklist items have been addressed
• reviewed code correctness and readability
• verified React components follow DRY principles
• reviewed documentation is accurate
• reviewed tests
• manually tested (if applicable)

[netlify]

✅ Deploy Preview for regen-website ready!

Name	Link
🔨 Latest commit	e552a7d
🔍 Latest deploy log	https://app.netlify.com/sites/regen-website/deploys/6790b8f5d8be650008083649
😎 Deploy Preview	https://deploy-preview-2580--regen-website.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[netlify]

✅ Deploy Preview for terrasos ready!

Name	Link
🔨 Latest commit	e552a7d
🔍 Latest deploy log	https://app.netlify.com/sites/terrasos/deploys/6790b8f56ed6870008ab175a
😎 Deploy Preview	https://deploy-preview-2580--terrasos.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[blushi]

@erikalogie @S4mmyb see testing instructions

[erikalogie]

@blushi this looks good, I think we should just reword the paragraph above the email (which could be separate task) to: "Input an email address to receive a receipt of your purchase. Note: You will receive an email with instructions to link this email to your account, allowing for easier access going forward, if desired.". Reason being that when I first glanced at the paragraph I read the "this is entirely optional" as pertaining to the field itself being optional.

[blushi]

@blushi this looks good, I think we should just reword the paragraph above the email (which could be separate task) to: "Input an email address to receive a receipt of your purchase. Note: You will receive an email with instructions to link this email to your account, allowing for easier access going forward, if desired.". Reason being that when I first glanced at the paragraph I read the "this is entirely optional" as pertaining to the field itself being optional.

Agreed, I also thought "this is entirely optional" at the end could be confusing.
I can update here.