feat(IT-Wallet): [SIW-3576] Implement engagement banner with new brand identity

[mastro993]

Short description

This PR implements the new IT-Wallet engagement banner component.

List of changes proposed in this pull request

Component enhancements and additions:

• Added the new ItwEngagementBanner component, which displays a title, description (with markdown support), action button, and optional dismiss button. This component is now showcased in the playground section. [1] [2] [3]
• Replaced the previous ItwHighlightBanner playground section with the new ItwEngagementBannerSection. [1] [2]

Prop and naming refactoring:

• Renamed the cornerRadius prop to borderRadius in ItwBrandedBox, ItwBrandedSkiaBorder, and related usages (including tests and other components), for consistency and clarity. [1] [2] [3] [4] [5] [6]
• Updated the placement of the borderRadius style in ItwBrandedBox to ensure it is applied correctly and consistently. [1] [2] [3] [4] [5] [6] [7] [8]

UI and alignment improvements:

• Centered the PoweredByItWalletText in credential detail screens for better visual alignment. [1] [2]
• Adjusted the layout of the PoweredByItWalletText component by removing justifyContent: "center" from its style for improved flexibility.

Code and import clean-up:

• Removed unused imports and cleaned up the playground components to reflect the new engagement banner usage. [1] [2] [3]

How to test

Go to Settings → Developer → Playgrounds → Documenti su IO → Components.
Verify that the new engagement banners are render correctly and the CTAs works as expected.

Preview

[RiccardoMolinari95]

LGTM

[RiccardoMolinari95]

LGTM