refactor: conditionalize profile fields, update chat navigation transitions, and fix provider state management during widget lifecycle

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

@@ -262,12 +262,14 @@ class _ProfileSettingsTabState extends ConsumerState<ProfileSettingsTab> {
         const SizedBox(height: 24),
 
         ProfileFormField(label: 'Full Name', controller: _fullNameController),
-        const SizedBox(height: 24),
-        ProfileFormField(
-          label: isAgent ? 'Career / Agent Type' : 'Professional Title',
-          controller: _titleController,
-          enabled: false,
-        ),
+        if (isAgent) ...[
+          const SizedBox(height: 24),
+          ProfileFormField(
+            label: 'Career / Agent Type',
+            controller: _titleController,
+            enabled: false,
+          ),
+        ],
         const SizedBox(height: 24),
         ProfileFormField(
             label: 'Email Address',