Fix PHPStan errors: add type annotations for list query results

[dereuromark]

Adds @var annotations to help PHPStan understand that find('list')->toArray() returns array<string, string>.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.04%. Comparing base (6ab3291) to head (61c7134).
⚠️ Report is 1 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff            @@
##             master     #467   +/-   ##
=========================================
  Coverage     77.03%   77.04%           
  Complexity      936      936           
=========================================
  Files            45       45           
  Lines          3166     3167    +1     
=========================================
+ Hits           2439     2440    +1     
  Misses          727      727           

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