fix: update attendance month handling to use lastMonths and correct month indexing

frontend/src/utils/utils.js

@@ -253,6 +253,23 @@ function calculateMonthFromDay(startDay, days) {
   }
 }
 
+function getLastMonthsWithYear(count) {
+  const result = []
+  const today = new Date()
+  let year = today.getFullYear()
+  let month = today.getMonth() // 0-11
+
+  for (let i = 0; i < count; i++) {
+    result.push({ year: year, month: month + 1 })
+    month--
+    if (month < 0) {
+      month = 11
+      year--
+    }
+  }
+  return result
+}
+
 export default {
   getDayOfWeek,
   extractTimeFromDateString,
@@ -267,4 +284,5 @@ export default {
   getMonthNumber,
   getMonthName,
   daysOfWeek,
+  getLastMonthsWithYear,
 }