feat: update input colors and text formatting

[amitabh94]

Description

This PR updates the staking UI components and text to improve visual consistency and clarity:

• Updated input text color from muted to deafult in both stake and unstake input views for better readability
• Simplified text color logic in InputDisplay by removing conditional coloring based on amount
• Enhanced unstaking tooltip text to be more precise

Related issues

Fixes: STAKE-863

Manual testing steps

1. Go to this page...

Screenshots/Recordings

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After

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• 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
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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]

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[github-actions]

Bitrise

❌❌❌ pr_smoke_e2e_pipeline failed on Bitrise! ❌❌❌

Commit hash: 5453872
Build link: https://app.bitrise.io/app/be69d4368ee7e86d/pipelines/57950007-e146-4558-9072-28669cf01749

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

Tip

• Check the documentation if you have any doubts on how to understand the failure on bitrise

[Matt561]

LGTM!

[sonarcloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

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

See analysis details on SonarCloud

[tommasini]

LGTM! It would be good if we have a screenshot of the changes on the PR description!