Restore silent SSO on app entry for users switching between apps.

Guests without a local session try prompt=none SSO first; marketing pages
are only for visitors with no platform session (localhost fix retained).

Co-authored-by: Cursor <cursoragent@cursor.com>

routes/web.php

@@ -17,7 +17,7 @@ use Illuminate\Support\Facades\Route;
 
 Route::get('/', fn () => auth()->check()
     ? redirect()->route('merchant.dashboard')
-    : redirect()->away((string) config('ladill.marketing_url')))->name('merchant.root');
+    : redirect()->route('sso.connect'))->name('merchant.root');
 
 Route::get('/login', [SsoLoginController::class, 'connect'])->name('login');
 Route::get('/sso/connect', [SsoLoginController::class, 'connect'])->name('sso.connect');