Fix the border radius on milestone cards when there are no items

What does this MR do and why?

Fix the border radius on milestone cards when there are no items

Screenshots or screen recordings

Before After
Screenshot 2026-02-28 at 19.36.02.png Screenshot 2026-02-28 at 19.40.23.png

How to set up and validate locally

  1. Checkout this branch and run gdk locally
  2. Go to any project's milestone page and open a single milestone that has 0 work items or 0 items on any categories like Unstarted, Ongoing or Completed
  3. Notice the rounded border radius on card item header that has 0 items
  4. Compare to master branch where it wasn't rounded (Check screenshots for better clarity)

Merge request reports

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