fix(frontend): Template Editor Rendering Issues

[matmair]

[UI] Template Editor Rendering Issues
Fixes #11558

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[SchrodingersGat]

@matmair nice work, thanks for digging into this. Can we add a playwright test to protect against regression here? Maybe looking for the right styles / colors in the editor?

[matmair]

I will look into that; have not used style assertions, but it seems possible from docs.

[matmair]

@SchrodingersGat I have added the requested test

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.43%. Comparing base (7e18555) to head (e86b9db).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11601      +/-   ##
==========================================
- Coverage   91.45%   91.43%   -0.02%     
==========================================
  Files         962      962              
  Lines       49754    49754              
==========================================
- Hits        45503    45495       -8     
- Misses       4251     4259       +8     

Components	Coverage Δ
Backend Apps	91.71% <ø> (-0.01%)	⬇️
Backend General	93.44% <ø> (ø)
Frontend	∅ <ø> (∅)

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