Filament Arabic and English locale switch with RTL layout

<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Request;
use Symfony\Component\HttpFoundation\Response;

class SetLocale
{
    public const SUPPORTED = ['en' => 'English', 'ar' => 'العربية'];

    public function handle(Request $request, Closure $next): Response
    {
        $locale = $request->session()->get('locale')
            ?? $request->user()?->locale
            ?? config('app.locale');

        // Whitelist: never pass raw input to setLocale().
        if (array_key_exists($locale, self::SUPPORTED)) {
            // Filament reads the direction from this locale's translation files,
            // so "ar" flips the whole panel to right-to-left on its own.
            app()->setLocale($locale);
        }

        return $next($request);
    }
}

// routes/web.php  (the switch endpoint used by the user menu items)
//
//   Route::get('/locale/{locale}', function (string $locale) {
//       abort_unless(array_key_exists($locale, SetLocale::SUPPORTED), 404);
//       session(['locale' => $locale]);
//       auth()->user()?->update(['locale' => $locale]);   // remember across devices
//
//       return redirect()->back();
//   })->name('locale.switch');

<?php

namespace App\Providers\Filament;

use App\Http\Middleware\SetLocale;
use Filament\Actions\Action;
use Filament\Panel;
use Filament\PanelProvider;

class AdminPanelProvider extends PanelProvider
{
    public function panel(Panel $panel): Panel
    {
        return $panel
            ->id('admin')
            ->path('admin')
            ->login()
            // Must run before Filament renders, so register it as panel middleware.
            ->middleware([SetLocale::class])
            ->userMenuItems($this->localeItems());
    }

    /** One menu entry per language other than the active one. */
    private function localeItems(): array
    {
        return collect(SetLocale::SUPPORTED)
            ->except(app()->getLocale())
            ->map(fn (string $label, string $code) => Action::make("locale-$code")
                ->label($label)
                ->icon('heroicon-o-language')
                ->url(fn () => route('locale.switch', $code)))
            ->values()
            ->all();
    }
}