Replace login form with single Nextcloud OAuth button

Removes email/password fields entirely; custom login page shows only
the blue "Mit Blue Spices Zanzibar Cloud anmelden" button.

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

app/Providers/Filament/UserPanelProvider.php

@@ -4,7 +4,6 @@ namespace App\Providers\Filament;
 
 use Filament\Navigation\NavigationGroup;
 use Filament\View\PanelsRenderHook;
-use Illuminate\Support\HtmlString;
 use Filament\Http\Middleware\Authenticate;
 use Filament\Http\Middleware\DisableBladeIconComponents;
 use Filament\Http\Middleware\DispatchServingFilamentEvent;
@@ -34,7 +33,7 @@ class UserPanelProvider extends PanelProvider
             ->default()
             ->path('dashboard')
             ->font('Jost')
-            ->login()
+            ->login(\App\Filament\Pages\Auth\Login::class)
             ->colors([
                 'primary' => '#33ccff'
             ])
@@ -46,22 +45,6 @@ class UserPanelProvider extends PanelProvider
                 NavigationGroup::make('Ressourcen'),
                 NavigationGroup::make('CRM'),
             ])
-            ->renderHook(
-                PanelsRenderHook::AUTH_LOGIN_FORM_AFTER,
-                fn () => new HtmlString(
-                    '<div class="mt-4">'
-                    . '<div class="relative flex items-center gap-3 py-1">'
-                    . '<div class="h-px flex-1 bg-gray-200 dark:bg-gray-700"></div>'
-                    . '<span class="text-xs text-gray-400 dark:text-gray-500">oder</span>'
-                    . '<div class="h-px flex-1 bg-gray-200 dark:bg-gray-700"></div>'
-                    . '</div>'
-                    . '<a href="' . route('auth.nextcloud') . '" class="mt-3 flex w-full items-center justify-center gap-2 rounded-lg border border-gray-300 bg-white px-4 py-2 text-sm font-medium text-gray-700 shadow-sm transition hover:bg-gray-50 dark:border-gray-600 dark:bg-gray-800 dark:text-gray-300 dark:hover:bg-gray-700">'
-                    . '<svg class="h-4 w-4" viewBox="0 0 50 50" fill="currentColor"><path d="M25 2C12.3 2 2 12.3 2 25s10.3 23 23 23 23-10.3 23-23S37.7 2 25 2zm0 7a7 7 0 110 14 7 7 0 010-14zm0 32c-5.8 0-10.9-2.9-14-7.3.1-4.6 9.3-7.2 14-7.2s13.9 2.5 14 7.2C35.9 38.1 30.8 41 25 41z"/></svg>'
-                    . 'Mit Nextcloud anmelden'
-                    . '</a>'
-                    . '</div>'
-                )
-            )
             ->renderHook(
                 PanelsRenderHook::SIDEBAR_FOOTER,
                 fn () => new HtmlString(