feat: integrate Clock In functionality with Firebase support and refactor attendance management

apps/mobile/packages/domain/lib/src/adapters/clock_in/clock_in_adapter.dart

@@ -0,0 +1,26 @@
+import '../../entities/shifts/shift.dart';
+import '../../entities/clock_in/attendance_status.dart';
+
+/// Adapter for Clock In related data.
+class ClockInAdapter {
+  
+  /// Converts primitive attendance data to [AttendanceStatus].
+  static AttendanceStatus toAttendanceStatus({
+    required String status,
+    DateTime? checkInTime,
+    DateTime? checkOutTime,
+    String? activeShiftId,
+  }) {
+    final bool isCheckedIn = status == 'CHECKED_IN' || status == 'LATE'; // Assuming LATE is also checked in?
+    
+    // Statuses that imply active attendance: CHECKED_IN, LATE.
+    // Statuses that imply completed: CHECKED_OUT.
+    
+    return AttendanceStatus(
+      isCheckedIn: isCheckedIn,
+      checkInTime: checkInTime,
+      checkOutTime: checkOutTime,
+      activeShiftId: activeShiftId,
+    );
+  }
+}