chore: register to bid ux/ui improvemnts

[MounirDhahri]

[Future Friday]

Description

This PR makes the following changes:

• Users were able to quit the flow directly without warning - now they will be warned about it If you swipe down, the modal will close and you will use your progress
• we probably don't want that to happen accidentally, I made the modal sheet not dismissible by swiping down, it will only be dismissed by click the X button If you press on Conditions of sale, we used top open it in a WebView where you could easily get lost
• now, we don't distract you from registering and open that externally so you are right where you left - just like we do in the SWA flow
• Use the new credit card input component
• The font sizes were a mess, custom line heights, custom font sizes etc.. I updated them to look more or less like what we do in other surfaces
• The paddings were massive inside the billing address screen - I made them a bit smaller to match our spacings in other areas.
• I fixed the small extra padding missing in the country picker Instead of manually going through the fields in billing address, you can simply use the keyboard "Next" to be navigated through them faster

Before

https://github.com/user-attachments/assets/08dfb578-e941-42c2-8d75-39833493e371

---

After

https://github.com/user-attachments/assets/7bb0e6a9-6bca-45ff-bb7a-abf58fc71606

https://github.com/user-attachments/assets/c6b0b60e-9e44-4528-b3b1-1763c369ddde

https://github.com/user-attachments/assets/6701d86e-f0b7-442f-84af-922e6cee9643

PR Checklist

• [x] I have tested my changes on iOS and Android.
• [x] I hid my changes behind a feature flag, or they don't need one.
• [x] I have included screenshots or videos, or I have not changed the UI.
• [x] I have added tests, or my changes don't require any.
• [x] I added an app state migration, or my changes do not require one.
• [x] I have documented any follow-up work that this PR will require, or it does not require any.
• [x] I have added a changelog entry below, or my changes do not require one.

To the reviewers 👀

• [ ] I would like at least one of the reviewers to run this PR on the simulator or device.

Changelog updates

### Changelog updates #### Cross-platform user-facing changes - register to bid ux/ui improvements - mounir #### iOS user-facing changes - #### Android user-facing changes - #### Dev changes -

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[ArtsyOpenSource]

This PR contains the following changes:

• Cross-platform user-facing changes (register to bid ux/ui improvements - mounir)

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