feat: replace logo with app name in navigation bar

Display APP_NAME from config instead of the ApplicationLogo SVG.
App name shared globally via Inertia HandleInertiaRequests middleware.

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

app/Http/Middleware/HandleInertiaRequests.php

@@ -38,6 +38,7 @@ class HandleInertiaRequests extends Middleware
                 'success' => fn () => $request->session()->get('success'),
                 'error' => fn () => $request->session()->get('error'),
             ],
+            'appName' => config('app.name'),
         ];
     }
 }