Added programmer role and fixed snackbar not showing

lib/widgets/app_shell.dart

@@ -404,7 +404,7 @@ List<NavSection> _buildSections(String role) {
     ),
   ];
 
-  if (role == 'admin' || role == 'dispatcher') {
+  if (role == 'admin' || role == 'programmer' || role == 'dispatcher') {
     return [
       NavSection(label: 'Operations', items: mainItems),
       NavSection(
@@ -508,7 +508,7 @@ List<NavItem> _standardNavItems() {
 }
 
 List<NavItem> _primaryItemsForRole(String role) {
-  if (role == 'admin') {
+  if (role == 'admin' || role == 'programmer') {
     return [
       NavItem(
         label: 'Dashboard',