Add doc to script file

src/utils/timeUtils.ts

@@ -1,4 +1,13 @@
-// Time utility functions
+/**
+ * Time Utility Functions
+ *
+ * Provides time format conversion utilities for working with HH:MM time strings
+ * and minute-based calculations throughout the application.
+ *
+ * @author Andreas Weyer
+ * @license MIT
+ */
+
 export const timeToMinutes = (timeStr: string): number => {
   if (!timeStr || !timeStr.includes(':')) return 0;
   const [hours, minutes] = timeStr.split(':').map(Number);