feat: Implement dashboard layout with navigation and role-based access, enhance authentication middleware to clear cache only on actual auth errors, and update expenses page metadata for authorization checks

pages/dashboard/expenses.vue

@@ -346,8 +346,9 @@ const ExpenseCreateModal = defineAsyncComponent(() => import('@/components/Expen
 
 // Page meta
 definePageMeta({
-  middleware: ['authentication'],
-  layout: 'dashboard'
+  middleware: ['authentication', 'authorization'],
+  layout: 'dashboard',
+  roles: ['sales', 'admin']
 });
 
 useHead({