Init

app/Http/Middleware/HandleAppearance.php

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+<?php
+
+namespace App\Http\Middleware;
+
+use Closure;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\View;
+use Symfony\Component\HttpFoundation\Response;
+
+class HandleAppearance
+{
+    /**
+     * Handle an incoming request.
+     *
+     * @param  \Closure(\Illuminate\Http\Request): (\Symfony\Component\HttpFoundation\Response)  $next
+     */
+    public function handle(Request $request, Closure $next): Response
+    {
+        View::share('appearance', $request->cookie('appearance') ?? 'system');
+
+        return $next($request);
+    }
+}

app/Http/Middleware/HandleInertiaRequests.php

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+<?php
+
+namespace App\Http\Middleware;
+
+use Illuminate\Http\Request;
+use Inertia\Middleware;
+
+class HandleInertiaRequests extends Middleware
+{
+    /**
+     * The root template that's loaded on the first page visit.
+     *
+     * @see https://inertiajs.com/server-side-setup#root-template
+     *
+     * @var string
+     */
+    protected $rootView = 'app';
+
+    /**
+     * Determines the current asset version.
+     *
+     * @see https://inertiajs.com/asset-versioning
+     */
+    public function version(Request $request): ?string
+    {
+        return parent::version($request);
+    }
+
+    /**
+     * Define the props that are shared by default.
+     *
+     * @see https://inertiajs.com/shared-data
+     *
+     * @return array<string, mixed>
+     */
+    public function share(Request $request): array
+    {
+        return [
+            ...parent::share($request),
+            'name' => config('app.name'),
+            'auth' => [
+                'user' => $request->user(),
+            ],
+            'sidebarOpen' => ! $request->hasCookie('sidebar_state') || $request->cookie('sidebar_state') === 'true',
+        ];
+    }
+}