feat: Limit professional expertise tags to three with a "more" pill and implement save button state management for profile settings based on field changes.

lib/features/profile/presentation/widgets/profile_settings_tab.dart

@@ -38,10 +38,23 @@ class _ProfileSettingsTabState extends ConsumerState<ProfileSettingsTab> {
     _emailController = TextEditingController();
     _phoneController = TextEditingController();
     _locationController = TextEditingController();
+    // Listen for changes to enable/disable Cancel & Save buttons
+    _fullNameController.addListener(_onFieldChanged);
+    _titleController.addListener(_onFieldChanged);
+    _phoneController.addListener(_onFieldChanged);
+    _locationController.addListener(_onFieldChanged);
+  }
+
+  void _onFieldChanged() {
+    setState(() {}); // triggers rebuild so _hasChanges is re-evaluated
   }
 
   @override
   void dispose() {
+    _fullNameController.removeListener(_onFieldChanged);
+    _titleController.removeListener(_onFieldChanged);
+    _phoneController.removeListener(_onFieldChanged);
+    _locationController.removeListener(_onFieldChanged);
     _fullNameController.dispose();
     _titleController.dispose();
     _emailController.dispose();

lib/features/profile/presentation/widgets/profile_shared_widgets.dart

@@ -146,8 +146,10 @@ class ProfileActionButtons extends StatelessWidget {
           Expanded(
             flex: 3,
             child: GestureDetector(
-              onTap: isSaving ? null : onSave,
-              child: Container(
+              onTap: (isSaving || !hasChanges) ? null : onSave,
+              child: Opacity(
+                opacity: hasChanges ? 1.0 : 0.5,
+                child: Container(
                 height: 31,
                 padding: const EdgeInsets.symmetric(horizontal: 8),
                 decoration: BoxDecoration(
@@ -174,6 +176,7 @@ class ProfileActionButtons extends StatelessWidget {
                             )),
                       ),
               ),
+              ),
             ),
           ),
         ],