Set box-sizing: border-box globally

[nulmete]

Related issue: Resolves #

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 (WIP)

Some breaking stuff I noticed locally:

• https://localhost:8080/reports/new?fleet_id=2 -> Content in general is a little bit more compact
• Tabbed nav (See gear icon on the top right of “Hosts online” in dashboard page).
• https://localhost:8080/software/add/fleet-maintained/1?fleet_id=2 -> when clicking “Show details” or “Add software” the content in the back shrinks.
• https://localhost:8080/software/titles/1?fleet_id=2 -> Actions dropdown content (not the dropdown itself)
• https://localhost:8080/reports/new?fleet_id=2 -> Radio button inner circle when checked is not centered

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.19%. Comparing base (c3eec08) to head (d786ca0).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #47429   +/-   ##
=======================================
  Coverage   67.19%   67.19%           
=======================================
  Files        3305     3305           
  Lines      228025   228025           
  Branches    11896    11896           
=======================================
  Hits       153224   153224           
  Misses      60986    60986           
  Partials    13815    13815           

Flag	Coverage Δ
frontend	57.81% <ø> (ø)

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