refactor: sonar issue reduce -> flatMap (#2281) #1589

Job	Run time
Prepare CI	3s
Lint App / biomejs	17s
Tests / Run Tests	2m 29s
Tests / SonarQube Cloud Analysis	1m 15s
Build / Build macOS (electron-builder)	3m 39s
Build / Build Linux (electron-builder)	5m 18s
Build / Build Windows (electron-builder)	2m 28s
	15m 29s

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