Enhance root layout and admin interface for better usability

- Updated the root layout to include a mobile menu toggle, improving navigation on smaller screens.
- Refactored navigation links and language/theme selection for better organization and accessibility.
- Added overflow handling for admin navigation and tables to ensure proper display on smaller screens.
- Improved translations for menu toggle accessibility in both Russian and English.

frontend/src/routes/admin/roles.tsx

@@ -45,6 +45,7 @@ function AdminRolesPage() {
       )}
 
       {data && (
+        <div className="overflow-x-auto">
         <table className="w-full text-left text-sm">
           <thead>
             <tr className="border-b border-border text-muted-foreground">
@@ -84,6 +85,7 @@ function AdminRolesPage() {
             ))}
           </tbody>
         </table>
+        </div>
       )}
 
       {editing && <RoleFormDialog role={editing} open={!!editing} onOpenChange={(open) => !open && setEditing(null)} />}