Add ping endpoint, update-refresh prompt, and dark-mode polish

routes/web.php

@@ -1,6 +1,7 @@
 <?php
 
 use App\Http\Controllers\InstallerController;
+use App\Http\Controllers\PingController;
 use Illuminate\Foundation\Http\Middleware\VerifyCsrfToken;
 use Illuminate\Support\Facades\Route;
 
@@ -29,6 +30,8 @@ Route::get('/reset-password', function () {
     return view('app');
 })->name('password.reset');
 
+Route::get('/ping', PingController::class);
+
 Route::get('/{any}', function () {
     if (!file_exists(base_path('.env'))) {
         return redirect('/install');