chnages has been made for the request leave and request advance

lib/screens/request_advance_scrren.dart

@@ -20,6 +20,7 @@ class _RequestAdvanceScreenState extends State<RequestAdvanceScreen> {
   // Text controller for reason
   final TextEditingController reasonController = TextEditingController();
 
+  // Use the singleton instance
   final RequestService _requestService = RequestService();
 
   // Method to save the advance request
@@ -48,26 +49,37 @@ class _RequestAdvanceScreenState extends State<RequestAdvanceScreen> {
       return;
     }
 
-    // Create a new advance request
+    // Create a new advance request with default status "waiting"
     final advanceRequest = AdvanceRequest(
       id: DateTime.now().millisecondsSinceEpoch.toString(),
       amount: amount,
       reason: reasonController.text,
+      status: "waiting", // Default status
     );
 
-    // Save the advance request
-    await _requestService.addAdvanceRequest(advanceRequest);
+    try {
+      // Save the advance request
+      await _requestService.addAdvanceRequest(advanceRequest);
 
-    // Show a success message
-    ScaffoldMessenger.of(context).showSnackBar(
-      const SnackBar(
-        content: Text('تم إرسال طلب السلفة بنجاح'),
-        backgroundColor: Colors.green,
-      ),
-    );
+      // Show a success message
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(
+          content: Text('تم إرسال طلب السلفة بنجاح'),
+          backgroundColor: Colors.green,
+        ),
+      );
 
-    // Navigate back to the previous screen
-    Navigator.pop(context);
+      // Navigate back to the previous screen
+      Navigator.pop(context);
+    } catch (e) {
+      // Show an error message if something went wrong
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          content: Text('حدث خطأ: $e'),
+          backgroundColor: Colors.red,
+        ),
+      );
+    }
   }
 
   @override