UI cleanup

[SchrodingersGat]

As a follow-up to #6293, adds some UI cleanup and playwright testing

[netlify]

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Lighthouse	1 paths audited Performance: 96 (no change from production) Accessibility: 89 (no change from production) Best Practices: 92 (no change from production) SEO: 78 (no change from production) PWA: - View the detailed breakdown and full score reports

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[codecov]

Codecov Report

Attention: Patch coverage is 67.85714% with 9 lines in your changes missing coverage. Please review.

Project coverage is 86.10%. Comparing base (44cca7d) to head (d1c48d5).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...Index/Settings/AccountSettings/SecurityContent.tsx	55.55%	6 Missing and 2 partials ⚠️
src/frontend/src/components/SplashScreen.tsx	87.50%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #9140   +/-   ##
=======================================
  Coverage   86.09%   86.10%           
=======================================
  Files        1178     1179    +1     
  Lines       52048    52052    +4     
  Branches     2171     2171           
=======================================
+ Hits        44810    44818    +8     
+ Misses       6679     6673    -6     
- Partials      559      561    +2     

Flag	Coverage Δ
pui	69.31% <67.85%> (+0.04%)	⬆️

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