feat: Implement read cursor activity tracking and recent activity dashboard with context

app/Http/Middleware/HandleInertiaRequests.php

@@ -42,6 +42,14 @@ class HandleInertiaRequests extends Middleware
                 'user' => $request->user(),
             ],
             'sidebarOpen' => ! $request->hasCookie('sidebar_state') || $request->cookie('sidebar_state') === 'true',
+            'unreadNotificationsCount' => function () use ($request) {
+                if (! $request->user()) {
+                    return 0;
+                }
+                
+                $service = app(\App\Services\ActivityService::class);
+                return count($service->getUnreadEntitiesGrouped($request->user()));
+            },
         ];
     }
 }