Handle GET /dashboard/logout to prevent 500 on direct URL access

Filament logout only accepts POST; redirect GET requests to dashboard.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

routes/web.php

@@ -8,6 +8,7 @@ Route::get('/', function () {
 });
 
 Route::get('/dashboard/login', fn () => redirect()->route('auth.nextcloud'));
+Route::get('/dashboard/logout', fn () => redirect('/dashboard'));
 
 Route::get('/oauth/redirect', [OAuthController::class, 'redirect'])->name('auth.nextcloud');
 Route::get('/auth/nextcloud/callback', [OAuthController::class, 'callback'])->name('auth.nextcloud.callback');