fix: Enhance contact number validation in organization form

lib/view/auth/request_demo_bottom_sheet.dart

@@ -272,25 +272,40 @@ class _OrganizationFormState extends State<_OrganizationForm> {
     );
   }
 
-  Widget _buildTextField(String fieldName, String label,
+ Widget _buildTextField(String fieldName, String label,
-      {TextInputType keyboardType = TextInputType.text}) {
+    {TextInputType keyboardType = TextInputType.text}) {
-    final controller = validator.getController(fieldName);
+  final controller = validator.getController(fieldName);
-    final validatorFunc = validator.getValidation<String>(fieldName);
+  final defaultValidator = validator.getValidation<String>(fieldName);
 
-    return Padding(
+  // Custom logic for contact number
-      padding: const EdgeInsets.symmetric(vertical: 6),
+  String? Function(String?)? validatorFunc = defaultValidator;
-      child: TextFormField(
+  if (fieldName == 'contactNumber') {
-        controller: controller,
+    validatorFunc = (value) {
-        keyboardType: keyboardType,
+      if (value == null || value.isEmpty) {
-        decoration: InputDecoration(
+        return 'Contact number is required';
-          labelText: label,
+      }
-          border: const OutlineInputBorder(),
+      if (!RegExp(r'^\d{10}$').hasMatch(value)) {
-        ),
+        return 'Enter a valid 10-digit contact number';
-        validator: validatorFunc,
+      }
-      ),
+      return null;
-    );
+    };
   }
 
+  return Padding(
+    padding: const EdgeInsets.symmetric(vertical: 6),
+    child: TextFormField(
+      controller: controller,
+      keyboardType: keyboardType,
+      decoration: InputDecoration(
+        labelText: label,
+        border: const OutlineInputBorder(),
+      ),
+      validator: validatorFunc,
+    ),
+  );
+}
+
+
   void _submitForm() async {
     bool isValid = validator.validateForm();
 
@@ -308,7 +323,7 @@ class _OrganizationFormState extends State<_OrganizationForm> {
     }
 
     if (isValid) {
-      setState(() => _loading = true); 
+      setState(() => _loading = true);
 
       final formData = validator.getData();
 
@@ -326,7 +341,7 @@ class _OrganizationFormState extends State<_OrganizationForm> {
 
       final error = await AuthService.requestDemo(requestBody);
 
-      setState(() => _loading = false); 
+      setState(() => _loading = false);
 
       if (error == null) {
         showAppSnackbar(