feat: implement multi-tenancy and super admin impersonation with security banner

app/Http/Middleware/HandleInertiaRequests.php

@@ -32,7 +32,22 @@ class HandleInertiaRequests extends Middleware
         return [
             ...parent::share($request),
             'auth' => [
-                'user' => $request->user() ? $request->user()->load('roles') : null,
+                'user' => $request->user() 
+                    ? $request->user()->load([
+                        'roles' => function($q) { $q->withoutGlobalScope('structure'); },
+                        'structure'
+                    ]) 
+                    : null,
+            ],
+            'tenant' => [
+                'current' => config('tenant.structure_id') 
+                    ? \App\Models\Structure::find(config('tenant.structure_id')) 
+                    : null,
+                'is_impersonating' => $request->session()->has('target_structure_id'),
+            ],
+            'flash' => [
+                'success' => $request->session()->get('success'),
+                'error' => $request->session()->get('error'),
             ],
         ];
     }