Fix first occurrence deletion

src/utils/date.js

@@ -103,24 +103,24 @@ function getWeeklyOccurrenceIndex(event, dateStr) {
     if (d.getTime() === baseStart.getTime()) {
       return 0 // Base occurrence is always index 0
     }
-    
+
     if (d < baseStart) {
       return null // Dates before base start in same week are not valid occurrences
     }
-    
+
     let occurrenceIndex = 0
     const cursor = new Date(baseStart)
-    
+
     // Count the base occurrence first
     if (pattern[cursor.getDay()]) occurrenceIndex++
-    
+
     // Move to the next day and count until we reach the target
     cursor.setDate(cursor.getDate() + 1)
     while (cursor <= d) {
       if (pattern[cursor.getDay()]) occurrenceIndex++
       cursor.setDate(cursor.getDate() + 1)
     }
-    
+
     // Subtract 1 because we want the index, not the count
     occurrenceIndex--
 
@@ -139,16 +139,16 @@ function getWeeklyOccurrenceIndex(event, dateStr) {
   const firstWeekCursor = new Date(baseStart)
   const firstWeekEnd = new Date(baseBlockStart)
   firstWeekEnd.setDate(firstWeekEnd.getDate() + 6) // End of first week (Sunday)
-  
+
   while (firstWeekCursor <= firstWeekEnd) {
     if (pattern[firstWeekCursor.getDay()]) firstWeekPatternDays++
     firstWeekCursor.setDate(firstWeekCursor.getDate() + 1)
   }
-  
+
   // For subsequent complete intervals, use the full pattern count
   const fullWeekdaysPerInterval = pattern.filter(Boolean).length
   const completeIntervals = blocksDiff / interval
-  
+
   // First interval uses actual first week count, remaining intervals use full count
   let occurrenceIndex = firstWeekPatternDays + (completeIntervals - 1) * fullWeekdaysPerInterval