feat: add auth guards and server-side logout with postcode search integration

- Add navigation guard requiring authentication for dashboard routes
- Create

resources/js/views/dashboard/DashboardLayout.vue

@@ -96,7 +96,7 @@ import { ref, computed, onMounted, onUnmounted } from 'vue'
 import { RouterLink, RouterView, useRoute, useRouter } from 'vue-router'
 import { useAuth } from '../../composables/useAuth.js'
 
-const { user, logout } = useAuth()
+const { user } = useAuth()
 const route = useRoute()
 const router = useRouter()
 
@@ -129,10 +129,8 @@ const userInitials = computed(() => {
         .toUpperCase()
 })
 
-async function handleLogout() {
-    dropdownOpen.value = false
-    await logout()
-    router.push('/')
+function handleLogout() {
+    window.location.href = '/logout'
 }
 
 function isActive(to) {