chnages has been made for the request leave and request advance

lib/models/advance_request.dart

@@ -2,12 +2,12 @@ class AdvanceRequest {
   final String id;
   final double amount;
   final String reason;
-  final String status; // e.g., "pending", "approved", "rejected"
+  final String status; // "waiting", "approved", or "denied"
 
   AdvanceRequest({
     required this.id,
     required this.amount,
     required this.reason,
-    this.status = "pending",
+    this.status = "waiting", // Default status is "waiting"
   });
 }