changed primary color usage to fix the color bug in dark mode

Changed Theme.of(context).primaryColor to Theme.of(contex).colorScheme.primary to make dark mode work properly.

lib/features/enquiry/screens/enquiry_screen.dart

@@ -34,12 +34,13 @@ class _EnquiryScreen extends State<EnquiryScreen> {
     return Column(
       crossAxisAlignment: CrossAxisAlignment.start,
       children: [
-        Text(role, style: const TextStyle(color: Colors.grey)),
+        Text(role,
+            style: TextStyle(color: Theme.of(context).colorScheme.onSurface)),
         const SizedBox(height: 4),
         GestureDetector(
           onTap: () => _launchEmailAddress(email),
           child: Text(email,
-              style: TextStyle(color: Theme.of(context).primaryColor)),
+              style: TextStyle(color: Theme.of(context).colorScheme.primary)),
         ),
         const SizedBox(height: 4),
         GestureDetector(
@@ -56,11 +57,7 @@ class _EnquiryScreen extends State<EnquiryScreen> {
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        title: Text(
-          AppLocalizations.of(context).enquiry,
-          style:
-              const TextStyle(color: Colors.black, fontWeight: FontWeight.w500),
-        ),
+        title: Text(AppLocalizations.of(context).enquiry),
         centerTitle: false,
       ),
       body: Padding(
@@ -72,12 +69,11 @@ class _EnquiryScreen extends State<EnquiryScreen> {
             const SizedBox(height: 20),
             Text(
               AppLocalizations.of(context).writeToUs,
-              style: const TextStyle(color: Colors.grey),
             ),
             const SizedBox(height: 4),
             Text(
               "complaint@kccb.in",
-              style: TextStyle(color: Theme.of(context).primaryColor),
+              style: TextStyle(color: Theme.of(context).colorScheme.primary),
             ),
 
             const SizedBox(height: 20),
@@ -85,11 +81,11 @@ class _EnquiryScreen extends State<EnquiryScreen> {
               AppLocalizations.of(context).keyContacts,
               style: TextStyle(
                 fontSize: 17,
-                color: Theme.of(context).primaryColor,
+                color: Theme.of(context).colorScheme.primary,
               ),
               // horizontal line
             ),
-            Divider(color: Colors.grey[300]),
+            Divider(color: Theme.of(context).colorScheme.outline),
             const SizedBox(height: 16),
             _buildContactItem(
               AppLocalizations.of(context).chairman,