fix: multiple button designs of dropdown

[Adarsh9977]

What does this PR do?

This PR fixes the design of last button of dropwown

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• I have self-reviewed the code (A decent size PR without self-review might be rejected).
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Checklist

• I haven't read the contributing guide
• My code doesn't follow the style guidelines of this project
• I haven't commented my code, particularly in hard-to-understand areas
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Summary by cubic

Fixed inconsistent border radius on the last button in dropdown menus to match design guidelines.

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[CLAassistant]

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[cubic-dev-ai]

cubic reviewed 6 files and found no issues. Review PR in cubic.dev.

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[graphite-app]

Graphite Automations

"Add consumer team as reviewer" took an action on this PR • (06/19/25)

1 reviewer was added to this PR based on Keith Williams's automation.

"Add community label" took an action on this PR • (06/19/25)

1 label was added to this PR based on Keith Williams's automation.

"Add ready-for-e2e label" took an action on this PR • (06/19/25)

1 label was added to this PR based on Keith Williams's automation.

[github-actions]

E2E results are ready!

• Workflow #63935.1 latest results