Fleet UI: fix unreleased disabled overlay sizing (#39305)

[RachelElysia]

Issue

Closes #39256

Description

• Merged into main already with Fleet UI: fix unreleased disabled overlay sizing #39305
• This is for the 4.81 RC branch

 1011  git fetch fleetdm
 1012  git checkout main
 1013  git pull fleetdm main
 1014  git checkout fleetdm/rc-minor-fleet-v4.81.0
 1015  git checkout -b 39256-rc
 1016  git log main
 1017  git cherry-pick ebacf3d2ba50e0a682c2c7a310438c93ed1830bd
 1018  git push -u fleetdm 39256-rc

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (rc-minor-fleet-v4.81.0@996e310). Learn more about missing BASE report.

Additional details and impacted files

@@                    Coverage Diff                    @@
##             rc-minor-fleet-v4.81.0   #39503   +/-   ##
=========================================================
  Coverage                          ?   66.17%           
=========================================================
  Files                             ?     2424           
  Lines                             ?   194107           
  Branches                          ?     8525           
=========================================================
  Hits                              ?   128448           
  Misses                            ?    53978           
  Partials                          ?    11681           

Flag	Coverage Δ
frontend	54.29% <ø> (?)

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