fix: hold to reveal UI/UX

[gantunesr]

Description

This PR fixes the UI/UX related to "Hold to reveal"

Related issues

Fixes: NA

Manual testing steps

1. Go to the Security & Privacy view
2. Try to reveal the SRP and/or Private Key
3. Verify that the hold to reveal UI/UX is fixed

Screenshots/Recordings

Before

Dark mode	Light mode
RPReplay_Final1723579466.MP4	RPReplay_Final1723579404.MP4

After

Dark mode	Light mode
RPReplay_Final1723577238.MP4	RPReplay_Final1723577401.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.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

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

See analysis details on SonarCloud

[github-actions]

Bitrise

❌❌❌ pr_smoke_e2e_pipeline failed on Bitrise! ❌❌❌

Commit hash: 5698427
Build link: https://app.bitrise.io/app/be69d4368ee7e86d/pipelines/e57fe31d-6663-46e4-be50-4219713c3a12

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