Create empty page for calendar table (#14479)

<img width="1512" height="876" alt="image"
src="https://github.com/user-attachments/assets/e845fb3a-9977-4ab7-9eb7-4e60e499165b"
/>

packages/twenty-server/src/engine/workspace-manager/dev-seeder/core/utils/seed-feature-flags.util.ts

@@ -70,6 +70,11 @@ export const seedFeatureFlags = async (
         workspaceId: workspaceId,
         value: false,
       },
+      {
+        key: FeatureFlagKey.IS_CALENDAR_VIEW_ENABLED,
+        workspaceId: workspaceId,
+        value: true,
+      },
     ])
     .execute();
 };