feat: upgrade Angular to v22, migrate eslint, improve tests

[cipchk]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.83%. Comparing base (90e52fd) to head (71d18d7).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #19      +/-   ##
==========================================
+ Coverage   95.65%   95.83%   +0.18%     
==========================================
  Files           2        2              
  Lines          46       48       +2     
  Branches       16        9       -7     
==========================================
+ Hits           44       46       +2     
  Misses          2        2              

Flag	Coverage Δ
unittests	95.83% <100.00%> (+0.18%)	⬆️

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