chore: Updated the homepage carousel with the new stacked cards

[brianacnguyen]

Description

This PR introduces the new StackCards design to the old Carousel
https://www.figma.com/design/9e6RSJCvezaLqDQ3mtE5wB/Home-Page?node-id=7353-12516&t=DP4LxNrYJXBeRUdq-0

Changelog

CHANGELOG entry: Updated announcement banner's design.

Related issues

Fixes: https://consensyssoftware.atlassian.net/jira/software/c/projects/DSYS/boards/1888?assignee=62afb43d33a882e2be47c36f&quickFilter=2109&selectedIssue=DSYS-157

Manual testing steps

Feature: my feature name

  Scenario: user [verb for user action]
    Given [describe expected initial app state]

    When user [verb for user action]
    Then [describe expected outcome]

Screenshots/Recordings

Before

After

Simulator.Screen.Recording.-.iPhone.15.Pro.Max.-.2025-09-11.at.12.38.29.mp4

Pre-merge author checklist

• I’ve followed MetaMask Contributor Docs and MetaMask Mobile Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
83.8% Coverage on New Code
9.2% Duplication on New Code

See analysis details on SonarQube Cloud