Standalone control panel breaks login page when OAuth is enabled

### Bug description

I'm trying to use Statamic as a headless CMS, so I don't need any non-control panel views and it can be hosted on it's own domain. To accomplish this, I set `cp.route` to an empty string.

This works generally, but it breaks the login screen when an OAuth provider is enabled. The offending line is [`resources/views/auth/login.blade.php`](https://github.com/statamic/cms/blob/0b6e0d203a184a2bdc258a5198246286e8a0945f/resources/views/auth/login.blade.php#L20):
```blade
@foreach ($providers as $provider)
    <div class="provider mb-2">
        <a href="{{ $provider->loginUrl() }}?redirect={{ parse_url(cp_route('index'))['path'] }}" class="w-full btn-primary">
                                                    {{-- ^----------------------------------^ --}}
            {{ __('Log in with :provider', ['provider' => $provider->label()]) }}
        </a>
    </div>
@endforeach
```

Since the `cp_route` helper returns the app URL without a trailing slash, the assoc. array from `parse_url` won't have a `path` key, causing an error to be thrown. From my limited testing, it can be fixed using:
```diff
diff --git a/resources/views/auth/login.blade.php b/resources/views/auth/login.blade.php
index a85845335..6af2a8cf0 100644
--- a/resources/views/auth/login.blade.php
+++ b/resources/views/auth/login.blade.php
@@ -17,7 +17,7 @@
                 <div class="login-oauth-providers">
                     @foreach ($providers as $provider)
                         <div class="provider mb-2">
-                            <a href="{{ $provider->loginUrl() }}?redirect={{ parse_url(cp_route('index'))['path'] }}" class="w-full btn-primary">
+                            <a href="{{ $provider->loginUrl() }}?redirect={{ parse_url(cp_route('index'))['path'] ?? '/' }}" class="w-full btn-primary">
                                 {{ __('Log in with :provider', ['provider' => $provider->label()]) }}
                             </a>
                         </div>
```

### How to reproduce

1. Enable an OAuth provider
2. Set `cp.route` to `''` directly or via environment variable
3. Attempt to login

### Logs

```shell
[2024-12-20 00:56:51] local.ERROR: Undefined array key "path" (View: /var/www/html/packages/cms/resources/views/auth/login.blade.php) {"exception":"[object] (Illuminate\\View\\ViewException(code: 0): Undefined array key \"path\" (View: /var/www/html/packages/cms/resources/views/auth/login.blade.php) at /var/www/html/storage/framework/views/9a7b0ef603a4c39f8ddc84dd633f0c32.php:20)
[stacktrace]
#0 /var/www/html/vendor/laravel/framework/src/Illuminate/View/Engines/PhpEngine.php(60): Illuminate\\View\\Engines\\CompilerEngine->handleViewException()
#1 /var/www/html/vendor/laravel/framework/src/Illuminate/View/Engines/CompilerEngine.php(75): Illuminate\\View\\Engines\\PhpEngine->evaluatePath()
#2 /var/www/html/vendor/laravel/framework/src/Illuminate/View/View.php(209): Illuminate\\View\\Engines\\CompilerEngine->get()
#3 /var/www/html/vendor/laravel/framework/src/Illuminate/View/View.php(192): Illuminate\\View\\View->getContents()
#4 /var/www/html/vendor/laravel/framework/src/Illuminate/View/View.php(161): Illuminate\\View\\View->renderContents()
#5 /var/www/html/vendor/laravel/framework/src/Illuminate/Http/Response.php(70): Illuminate\\View\\View->render()
#6 /var/www/html/vendor/laravel/framework/src/Illuminate/Http/Response.php(35): Illuminate\\Http\\Response->setContent()
#7 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Router.php(920): Illuminate\\Http\\Response->__construct()
#8 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Router.php(887): Illuminate\\Routing\\Router::toResponse()
#9 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Router.php(807): Illuminate\\Routing\\Router->prepareResponse()
#10 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(144): Illuminate\\Routing\\Router->Illuminate\\Routing\\{closure}()
#11 /var/www/html/packages/cms/src/Http/Middleware/CP/RedirectIfAuthorized.php(21): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#12 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Statamic\\Http\\Middleware\\CP\\RedirectIfAuthorized->handle()
#13 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TransformsRequest.php(21): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#14 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\\Foundation\\Http\\Middleware\\TransformsRequest->handle()
#15 /var/www/html/packages/cms/src/Http/Middleware/CP/AddToasts.php(22): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#16 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Statamic\\Http\\Middleware\\CP\\AddToasts->handle()
#17 /var/www/html/packages/cms/src/Http/Middleware/CP/AuthGuard.php(14): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#18 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Statamic\\Http\\Middleware\\CP\\AuthGuard->handle()
#19 /var/www/html/packages/cms/src/Http/Middleware/CP/ContactOutpost.php(21): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#20 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Statamic\\Http\\Middleware\\CP\\ContactOutpost->handle()
#21 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Middleware/SubstituteBindings.php(51): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#22 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\\Routing\\Middleware\\SubstituteBindings->handle()
#23 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/VerifyCsrfToken.php(88): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#24 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\\Foundation\\Http\\Middleware\\VerifyCsrfToken->handle()
#25 /var/www/html/vendor/laravel/framework/src/Illuminate/View/Middleware/ShareErrorsFromSession.php(49): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#26 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\\View\\Middleware\\ShareErrorsFromSession->handle()
#27 /var/www/html/vendor/laravel/framework/src/Illuminate/Session/Middleware/StartSession.php(121): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#28 /var/www/html/vendor/laravel/framework/src/Illuminate/Session/Middleware/StartSession.php(64): Illuminate\\Session\\Middleware\\StartSession->handleStatefulRequest()
#29 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\\Session\\Middleware\\StartSession->handle()
#30 /var/www/html/vendor/laravel/framework/src/Illuminate/Cookie/Middleware/AddQueuedCookiesToResponse.php(37): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#31 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\\Cookie\\Middleware\\AddQueuedCookiesToResponse->handle()
#32 /var/www/html/vendor/laravel/framework/src/Illuminate/Cookie/Middleware/EncryptCookies.php(75): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#33 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\\Cookie\\Middleware\\EncryptCookies->handle()
#34 /var/www/html/packages/cms/src/Http/Middleware/SwapExceptionHandler.php(19): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#35 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Statamic\\Http\\Middleware\\SwapExceptionHandler->handle()
#36 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(119): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#37 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Router.php(807): Illuminate\\Pipeline\\Pipeline->then()
#38 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Router.php(786): Illuminate\\Routing\\Router->runRouteWithinStack()
#39 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Router.php(750): Illuminate\\Routing\\Router->runRoute()
#40 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Router.php(739): Illuminate\\Routing\\Router->dispatchToRoute()
#41 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(201): Illuminate\\Routing\\Router->dispatch()
#42 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(144): Illuminate\\Foundation\\Http\\Kernel->Illuminate\\Foundation\\Http\\{closure}()
#43 /var/www/html/packages/cms/src/Http/Middleware/StopImpersonating.php(12): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#44 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Statamic\\Http\\Middleware\\StopImpersonating->handle()
#45 /var/www/html/packages/cms/src/Http/Middleware/DisableFloc.php(17): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#46 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Statamic\\Http\\Middleware\\DisableFloc->handle()
#47 /var/www/html/packages/cms/src/Http/Middleware/CheckMultisite.php(15): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#48 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Statamic\\Http\\Middleware\\CheckMultisite->handle()
#49 /var/www/html/packages/cms/src/Http/Middleware/CheckComposerJsonScripts.php(21): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#50 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Statamic\\Http\\Middleware\\CheckComposerJsonScripts->handle()
#51 /var/www/html/packages/cms/src/Http/Middleware/PoweredByHeader.php(18): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#52 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Statamic\\Http\\Middleware\\PoweredByHeader->handle()
#53 /var/www/html/vendor/barryvdh/laravel-debugbar/src/Middleware/InjectDebugbar.php(66): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#54 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Barryvdh\\Debugbar\\Middleware\\InjectDebugbar->handle()
#55 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TransformsRequest.php(21): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#56 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/ConvertEmptyStringsToNull.php(31): Illuminate\\Foundation\\Http\\Middleware\\TransformsRequest->handle()
#57 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\\Foundation\\Http\\Middleware\\ConvertEmptyStringsToNull->handle()
#58 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TransformsRequest.php(21): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#59 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TrimStrings.php(51): Illuminate\\Foundation\\Http\\Middleware\\TransformsRequest->handle()
#60 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\\Foundation\\Http\\Middleware\\TrimStrings->handle()
#61 /var/www/html/vendor/laravel/framework/src/Illuminate/Http/Middleware/ValidatePostSize.php(27): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#62 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\\Http\\Middleware\\ValidatePostSize->handle()
#63 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/PreventRequestsDuringMaintenance.php(110): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#64 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\\Foundation\\Http\\Middleware\\PreventRequestsDuringMaintenance->handle()
#65 /var/www/html/vendor/laravel/framework/src/Illuminate/Http/Middleware/HandleCors.php(49): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#66 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\\Http\\Middleware\\HandleCors->handle()
#67 /var/www/html/vendor/laravel/framework/src/Illuminate/Http/Middleware/TrustProxies.php(58): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#68 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\\Http\\Middleware\\TrustProxies->handle()
#69 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/InvokeDeferredCallbacks.php(22): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#70 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\\Foundation\\Http\\Middleware\\InvokeDeferredCallbacks->handle()
#71 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(119): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#72 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(176): Illuminate\\Pipeline\\Pipeline->then()
#73 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(145): Illuminate\\Foundation\\Http\\Kernel->sendRequestThroughRouter()
#74 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(1190): Illuminate\\Foundation\\Http\\Kernel->handle()
#75 /var/www/html/public/index.php(17): Illuminate\\Foundation\\Application->handleRequest()
#76 {main}

[previous exception] [object] (ErrorException(code: 0): Undefined array key \"path\" at /var/www/html/storage/framework/views/9a7b0ef603a4c39f8ddc84dd633f0c32.php:20)
[stacktrace]
#0 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php(290): Illuminate\\Foundation\\Bootstrap\\HandleExceptions->handleError()
#1 /var/www/html/storage/framework/views/9a7b0ef603a4c39f8ddc84dd633f0c32.php(20): Illuminate\\Foundation\\Bootstrap\\HandleExceptions->Illuminate\\Foundation\\Bootstrap\\{closure}()
#2 /var/www/html/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php(123): require('...')
#3 /var/www/html/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php(124): Illuminate\\Filesystem\\Filesystem::Illuminate\\Filesystem\\{closure}()
#4 /var/www/html/vendor/laravel/framework/src/Illuminate/View/Engines/PhpEngine.php(58): Illuminate\\Filesystem\\Filesystem->getRequire()
#5 /var/www/html/vendor/laravel/framework/src/Illuminate/View/Engines/CompilerEngine.php(75): Illuminate\\View\\Engines\\PhpEngine->evaluatePath()
#6 /var/www/html/vendor/laravel/framework/src/Illuminate/View/View.php(209): Illuminate\\View\\Engines\\CompilerEngine->get()
#7 /var/www/html/vendor/laravel/framework/src/Illuminate/View/View.php(192): Illuminate\\View\\View->getContents()
#8 /var/www/html/vendor/laravel/framework/src/Illuminate/View/View.php(161): Illuminate\\View\\View->renderContents()
#9 /var/www/html/vendor/laravel/framework/src/Illuminate/Http/Response.php(70): Illuminate\\View\\View->render()
#10 /var/www/html/vendor/laravel/framework/src/Illuminate/Http/Response.php(35): Illuminate\\Http\\Response->setContent()
#11 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Router.php(920): Illuminate\\Http\\Response->__construct()
#12 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Router.php(887): Illuminate\\Routing\\Router::toResponse()
#13 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Router.php(807): Illuminate\\Routing\\Router->prepareResponse()
#14 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(144): Illuminate\\Routing\\Router->Illuminate\\Routing\\{closure}()
#15 /var/www/html/packages/cms/src/Http/Middleware/CP/RedirectIfAuthorized.php(21): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#16 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Statamic\\Http\\Middleware\\CP\\RedirectIfAuthorized->handle()
#17 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TransformsRequest.php(21): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#18 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\\Foundation\\Http\\Middleware\\TransformsRequest->handle()
#19 /var/www/html/packages/cms/src/Http/Middleware/CP/AddToasts.php(22): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#20 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Statamic\\Http\\Middleware\\CP\\AddToasts->handle()
#21 /var/www/html/packages/cms/src/Http/Middleware/CP/AuthGuard.php(14): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#22 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Statamic\\Http\\Middleware\\CP\\AuthGuard->handle()
#23 /var/www/html/packages/cms/src/Http/Middleware/CP/ContactOutpost.php(21): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#24 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Statamic\\Http\\Middleware\\CP\\ContactOutpost->handle()
#25 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Middleware/SubstituteBindings.php(51): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#26 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\\Routing\\Middleware\\SubstituteBindings->handle()
#27 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/VerifyCsrfToken.php(88): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#28 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\\Foundation\\Http\\Middleware\\VerifyCsrfToken->handle()
#29 /var/www/html/vendor/laravel/framework/src/Illuminate/View/Middleware/ShareErrorsFromSession.php(49): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#30 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\\View\\Middleware\\ShareErrorsFromSession->handle()
#31 /var/www/html/vendor/laravel/framework/src/Illuminate/Session/Middleware/StartSession.php(121): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#32 /var/www/html/vendor/laravel/framework/src/Illuminate/Session/Middleware/StartSession.php(64): Illuminate\\Session\\Middleware\\StartSession->handleStatefulRequest()
#33 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\\Session\\Middleware\\StartSession->handle()
#34 /var/www/html/vendor/laravel/framework/src/Illuminate/Cookie/Middleware/AddQueuedCookiesToResponse.php(37): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#35 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\\Cookie\\Middleware\\AddQueuedCookiesToResponse->handle()
#36 /var/www/html/vendor/laravel/framework/src/Illuminate/Cookie/Middleware/EncryptCookies.php(75): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#37 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\\Cookie\\Middleware\\EncryptCookies->handle()
#38 /var/www/html/packages/cms/src/Http/Middleware/SwapExceptionHandler.php(19): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#39 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Statamic\\Http\\Middleware\\SwapExceptionHandler->handle()
#40 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(119): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#41 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Router.php(807): Illuminate\\Pipeline\\Pipeline->then()
#42 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Router.php(786): Illuminate\\Routing\\Router->runRouteWithinStack()
#43 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Router.php(750): Illuminate\\Routing\\Router->runRoute()
#44 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Router.php(739): Illuminate\\Routing\\Router->dispatchToRoute()
#45 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(201): Illuminate\\Routing\\Router->dispatch()
#46 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(144): Illuminate\\Foundation\\Http\\Kernel->Illuminate\\Foundation\\Http\\{closure}()
#47 /var/www/html/packages/cms/src/Http/Middleware/StopImpersonating.php(12): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#48 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Statamic\\Http\\Middleware\\StopImpersonating->handle()
#49 /var/www/html/packages/cms/src/Http/Middleware/DisableFloc.php(17): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#50 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Statamic\\Http\\Middleware\\DisableFloc->handle()
#51 /var/www/html/packages/cms/src/Http/Middleware/CheckMultisite.php(15): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#52 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Statamic\\Http\\Middleware\\CheckMultisite->handle()
#53 /var/www/html/packages/cms/src/Http/Middleware/CheckComposerJsonScripts.php(21): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#54 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Statamic\\Http\\Middleware\\CheckComposerJsonScripts->handle()
#55 /var/www/html/packages/cms/src/Http/Middleware/PoweredByHeader.php(18): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#56 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Statamic\\Http\\Middleware\\PoweredByHeader->handle()
#57 /var/www/html/vendor/barryvdh/laravel-debugbar/src/Middleware/InjectDebugbar.php(66): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#58 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Barryvdh\\Debugbar\\Middleware\\InjectDebugbar->handle()
#59 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TransformsRequest.php(21): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#60 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/ConvertEmptyStringsToNull.php(31): Illuminate\\Foundation\\Http\\Middleware\\TransformsRequest->handle()
#61 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\\Foundation\\Http\\Middleware\\ConvertEmptyStringsToNull->handle()
#62 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TransformsRequest.php(21): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#63 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TrimStrings.php(51): Illuminate\\Foundation\\Http\\Middleware\\TransformsRequest->handle()
#64 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\\Foundation\\Http\\Middleware\\TrimStrings->handle()
#65 /var/www/html/vendor/laravel/framework/src/Illuminate/Http/Middleware/ValidatePostSize.php(27): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#66 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\\Http\\Middleware\\ValidatePostSize->handle()
#67 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/PreventRequestsDuringMaintenance.php(110): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#68 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\\Foundation\\Http\\Middleware\\PreventRequestsDuringMaintenance->handle()
#69 /var/www/html/vendor/laravel/framework/src/Illuminate/Http/Middleware/HandleCors.php(49): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#70 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\\Http\\Middleware\\HandleCors->handle()
#71 /var/www/html/vendor/laravel/framework/src/Illuminate/Http/Middleware/TrustProxies.php(58): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#72 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\\Http\\Middleware\\TrustProxies->handle()
#73 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/InvokeDeferredCallbacks.php(22): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#74 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\\Foundation\\Http\\Middleware\\InvokeDeferredCallbacks->handle()
#75 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(119): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#76 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(176): Illuminate\\Pipeline\\Pipeline->then()
#77 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(145): Illuminate\\Foundation\\Http\\Kernel->sendRequestThroughRouter()
#78 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(1190): Illuminate\\Foundation\\Http\\Kernel->handle()
#79 /var/www/html/public/index.php(17): Illuminate\\Foundation\\Application->handleRequest()
#80 {main}
"}
```


### Environment

```yaml
Environment
Application Name: Statamic
Laravel Version: 11.36.1
PHP Version: 8.3.14
Composer Version: 2.8.4
Environment: local
Debug Mode: ENABLED
URL: statamic.ddev.site
Maintenance Mode: OFF
Timezone: UTC
Locale: en

Cache
Config: NOT CACHED
Events: NOT CACHED
Routes: NOT CACHED
Views: CACHED

Drivers
Broadcasting: log
Cache: file
Database: pgsql
Logs: **stack** / single
Mail: smtp
Queue: sync
Session: file

Statamic
Addons: 0
Sites: 1
Stache Watcher: Enabled (auto)
Static Caching: Disabled
Version: 5.x-dev Solo
```


### Installation

Fresh statamic/statamic site via CLI

### Additional details

I also tried setting `cp.route` to `/` instead to work around this. It does not fix the issue and seems to cause other issues, particularly with redirects.

OAuth flow initiations immediately redirect back to `/auth/login` instead of the provider. Similarly, navigating `/auth/login` or `/` when already logged in redirects to `https://dashboard`.

Navigation Menu

Uh oh!

Uh oh!

Standalone control panel breaks login page when OAuth is enabled #11290

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Uh oh!

Uh oh!

Standalone control panel breaks login page when OAuth is enabled #11290

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