[Brand Updates] Update prologue screen

[hichamboushaba]

Closes: woocommerce/woomobile-private#385

Description

This PR updates the prologue screen design to match the new brand update (Ntkk0ER4hHt5y9KjEGIiGk-fi-2603_9953), the changes are based on the Authenticator library PR, and in addition to this, the prologue top section is updated to use SwiftUI, and is decoupled now from the carousel content.

Steps to reproduce

1. Logout if needed.
2. Open the app and check the prologue screen.

Testing information

• Confirm the prologue behaves correctly in different screen sizes.
• Confirm the prologue look in dark and light themes.

Tested using an iPhone 16 and iPad 10th gen simulators, iOS 18.1.

Screenshots

Light	Dark

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• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

Reviewer (or Author, in the case of optional code reviews):

Please make sure these conditions are met before approving the PR, or request changes if the PR needs improvement:

• The PR is small and has a clear, single focus, or a valid explanation is provided in the description. If needed, please request to split it into smaller PRs.
• Ensure Adequate Unit Test Coverage: The changes are reasonably covered by unit tests or an explanation is provided in the PR description.
• Manual Testing: The author listed all the tests they ran, including smoke tests when needed (e.g., for refactorings). The reviewer confirmed that the PR works as expected on all devices (phone/tablet) and no regressions are added.

[dangermattic]

	1 Warning
⚠️	This PR is larger than 300 lines of changes. Please consider splitting it into smaller PRs for easier and faster reviews.

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[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce iOS by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce iOS
	Build Number	pr14773-3f424c1
	Version	21.2
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	3f424c1
	App Center Build	WooCommerce - Prototype Builds #12326

Automatticians: You can use our internal self-serve MC tool to give yourself access to App Center if needed.

[hichamboushaba]

I removed this part, we don't enforce any orientation now, the Authentication library still enforces portrait orientation for phones, but at least now iPads can show the app in landscape.

[itsmeichigo]

Tested both light and dark modes on iPhone SE, iPhone 16 Plus and iPad mini simulators and confirmed that the prologue screen now looks as expected.