fix: Update regularization time picker to use reference time and allow past times for regularization

lib/model/attendance/attendence_action_button.dart

@@ -41,33 +41,26 @@ class _AttendanceActionButtonState extends State<AttendanceActionButton> {
     });
   }
 
-  Future<DateTime?> _pickRegularizationTime(DateTime checkInTime) async {
+  Future<DateTime?> _pickRegularizationTime(DateTime referenceTime) async {
     final pickedTime = await showTimePicker(
       context: context,
-      initialTime: TimeOfDay.fromDateTime(DateTime.now()),
+      initialTime:
+          TimeOfDay.fromDateTime(referenceTime), // start from actual log time
     );
 
     if (pickedTime == null) return null;
 
     final selected = DateTime(
-      checkInTime.year,
-      checkInTime.month,
-      checkInTime.day,
+      referenceTime.year,
+      referenceTime.month,
+      referenceTime.day,
       pickedTime.hour,
       pickedTime.minute,
     );
 
     final now = DateTime.now();
 
-    if (selected.isBefore(checkInTime)) {
-      showAppSnackbar(
-        title: "Invalid Time",
-        message: "Time must be after check-in.",
-        type: SnackbarType.warning,
-      );
-      return null;
-    }
-
+    // Allow times before check-in for regularization, but never future
     if (selected.isAfter(now)) {
       showAppSnackbar(
         title: "Invalid Time",