add border to eua empty state

[MagnusHJensen]

Related issue: Resolves #32630

Checklist for submitter

If some of the following don't apply, delete the relevant line.

• Changes file added for user-visible changes in changes/, orbit/changes/ or ee/fleetd-chrome/changes.
  See Changes files for more information.

Testing

• QA'd all new/changed functionality manually

Media:

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.12%. Comparing base (77972a5) to head (aa621ec).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #33457   +/-   ##
=======================================
  Coverage   64.12%   64.12%           
=======================================
  Files        2061     2061           
  Lines      205384   205384           
  Branches     6691     6782   +91     
=======================================
  Hits       131698   131698           
  Misses      63307    63307           
  Partials    10379    10379           

Flag	Coverage Δ
frontend	53.26% <ø> (ø)

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