feat: add flash message sharing to HandleInertiaRequests middleware

app/Http/Middleware/HandleInertiaRequests.php

@@ -42,6 +42,10 @@ public function share(Request $request): array
                 'user' => $request->user(),
             ],
             'sidebarOpen' => ! $request->hasCookie('sidebar_state') || $request->cookie('sidebar_state') === 'true',
+            'flash' => [
+                'success' => $request->session()->get('success'),
+                'error' => $request->session()->get('error'),
+            ],
         ];
     }
 }