feat: Add page for user to opt in for smart account

[jpuri]

Description

Add page for user to opt in for smart account

Related issues

Fixes: https://github.com/MetaMask/MetaMask-planning/issues/5262

Manual testing steps

1. Go to test dapp and submit 5792 request
2. On splash page you should be able to opt-in for multiple accounts

Screenshots/Recordings

Splash page:

Slide:

Screen.Recording.2025-07-09.at.11.58.58.AM.mov

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.

[github-actions]

Bitrise

✅✅✅ pr_smoke_e2e_pipeline passed on Bitrise! ✅✅✅

Commit hash: 816be55
Build link: https://app.bitrise.io/app/be69d4368ee7e86d/pipelines/30ffab12-e6b7-4f30-b713-d36b28801277

Note

• You can kick off another pr_smoke_e2e_pipeline on Bitrise by removing and re-applying the Run Smoke E2E label on the pull request

[github-actions]

Bitrise

✅✅✅ pr_smoke_e2e_pipeline passed on Bitrise! ✅✅✅

Commit hash: 7126936
Build link: https://app.bitrise.io/app/be69d4368ee7e86d/pipelines/e456afe1-7ef4-4546-98aa-daef170d6640

Note

• You can kick off another pr_smoke_e2e_pipeline on Bitrise by removing and re-applying the Run Smoke E2E label on the pull request

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
82.2% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud