Fix image and audio result focus rings

[obulat]

Fixes

Fixes #3525 by @fcoveram
Fixes #3193 by @fcoveram
Related to #4911 by @zackkrida

Description

This PR updates focus-bold-filled to set the inner ring to the color of the page background. It also updates the focus ring for the non-square image result.

The inner ring looks narrower in dark theme than it does in the light theme, so I updated the width for the dark theme.

Testing Instructions

Check the result focus rings for image, audio and all content results.
You can use the storybook to view image cell and the audio results

Checklist

• My pull request has a descriptive title (not a vague title likeUpdate index.md).
• My pull request targets the default branch of the repository (main) or a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.
• I ran the DAG documentation generator (ov just catalog/generate-docs for catalog
  PRs) or the media properties generator (ov just catalog/generate-docs media-props
  for the catalog or ov just api/generate-docs for the API) where applicable.

Developer Certificate of Origin

Developer Certificate of Origin

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[github-actions]

Full-stack documentation: https://docs.openverse.org/_preview/4959

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[github-actions]

Playwright failure test results: https://github.com/WordPress/openverse/actions/runs/10962448126

It looks like some of the Playwright tests failed. If you made changes to the frontend UI without updating snapshots, this might be the cause. You can download zipped patches containing the updated snapshots alongside a general trace of the tests under the "Artifacts" section in the above page. They're named in the form *_snapshot_diff and *_test_results respectively.

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If the test is flaky, follow the flaky test triage procedure.