feat: reduce opacity for past events

[germelmann]

fixes #26

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.71%. Comparing base (93374fa) to head (3fa906b).
Report is 6 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6102      +/-   ##
============================================
+ Coverage     24.02%   29.71%   +5.68%     
- Complexity      457      914     +457     
============================================
  Files           246      287      +41     
  Lines         11565    13836    +2271     
  Branches       2153     2164      +11     
============================================
+ Hits           2779     4111    +1332     
- Misses         8472     9410     +938     
- Partials        314      315       +1     

Flag	Coverage Δ
javascript	15.56% <ø> (ø)
php	58.65% <ø> (ø)

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[GretaD]

Tested and works 🥳

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