ISW-5431: double style bug for custom svgs

[bigfishdesign13]

Fixes JIRA ticket ISW-5431

This PR does the following:

• Fixed the double application of styles when a custom svg is passed into the Icon component.

How has this been tested?

• Local Storybook and unit tests

Accessibility concerns or updates

• n/a

Accessibility Checklist

• Checked Storybook's "Accessibility" tab for color contrast and other issues.
• The feature works with keyboard inputs including tabbing back and forward and pressing space, enter, arrow, and esc keys.
• For hidden text or when aria-live is used, a screenreader was used to verify the text is read.
• For features that involve UI updates and focusing on DOM refs, focus management was reviewed.
• The feature works when the page is zoomed in to 200% and 400%.

Open Questions

Checklist:

• I have updated the Storybook documentation and changelog accordingly.
• I have added relevant accessibility documentation for this pull request.
• All new and existing tests passed.

Front End Review:

• Review the Vercel preview deployment once it is ready.

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Project	Deployment	Actions	Updated (UTC)
nypl-design-system	Ready	Preview, Comment	Mar 3, 2026 6:36pm

[jackiequach]

Looks good to me! I appreciate the quick turnaround 😄

[EdwinGuzman]

nit: minor typo

[EdwinGuzman]

Update looks good in storybook.