NickAkhmetov/CAT-661 Fix View PDF button disappearance

[NickAkhmetov]

Summary

This PR fixes the "View PDF" button disappearing while the PDF is processing. It also fixes the styles for the PDF modal's "close" button, which had a typo that caused the background of the close button to show up without a border radius.

Design Documentation/Original Tickets

https://hms-dbmi.atlassian.net/browse/CAT-661

Testing

Tested manually with datasets linked in original ticket.

Screenshots/Video

View button doesn't disappear while loading anymore: https://github.com/user-attachments/assets/63bae256-bdf2-4c55-be4c-a274496c21d7

Close button has appropriate styles:

Checklist

• [x] Code follows the project's coding standards
  • [x] Lint checks pass locally
  • [x] New CHANGELOG-your-feature-name-here.md is present in the root directory, describing the change(s) in full sentences.
• [x] Unit tests covering the new feature have been added
• [x] All existing tests pass
• [x] Any relevant documentation in JIRA/Confluence has been updated to reflect the new feature
• [x] Any new functionalities have appropriate analytics functionalities added

Additional Notes

Please specify any additional information or context relevant to this PR.

[NickAkhmetov]

Looks good to me! Was there any more investigation into why the PDF is cropped?

Good catch - I didn't spot this during development since it shows up uncropped for me, but I've got a big screen. I'll improve the PDF display so it doesn't overflow the viewport.