Fix starred scope page tree and local edit save

rust/crates/mnote-web/src/routes/kernel.rs

@@ -4,7 +4,7 @@ use crate::error::WebError;
 use crate::routes::local_folder_source::{
     ensure_local_workspace_read_access_with_state, load_local_folder_file_tree_children_snapshot,
     load_local_folder_file_tree_snapshot, load_local_folder_file_tree_snapshot_with_reveal,
-    load_local_folder_page_tree_snapshot,
+    load_local_folder_page_tree_scope_snapshot, load_local_folder_page_tree_snapshot,
 };
 use crate::routes::query_support::resolve_effective_workspace_id;
 use crate::routes::snapshot_support::{
@@ -120,6 +120,8 @@ async fn project_projection(
                 } else {
                     load_local_folder_file_tree_snapshot(&root_uri)
                 }
+            } else if let Some(parent_relative_path) = parent_relative_path.as_deref() {
+                load_local_folder_page_tree_scope_snapshot(&root_uri, parent_relative_path)
             } else {
                 load_local_folder_page_tree_snapshot(&root_uri)
             }
@@ -422,6 +424,52 @@ mod tests {
         let _ = std::fs::remove_dir_all(&root);
     }
 
+    #[tokio::test]
+    async fn local_folder_page_projection_can_scope_by_parent_path() {
+        let root = std::env::temp_dir().join(format!(
+            "mnote-local-kernel-page-scope-{}",
+            std::process::id()
+        ));
+        let _ = std::fs::remove_dir_all(&root);
+        std::fs::create_dir_all(root.join("design")).expect("create design");
+        std::fs::write(root.join("Home.md"), "# Home\n").expect("write home");
+        std::fs::write(root.join("Other.md"), "# Other\n").expect("write other");
+        std::fs::write(root.join("design").join("Brief.md"), "# Brief\n").expect("write brief");
+        let root_uri = format!("file://{}", root.display());
+        initialize_local_workspace_for_actor("dev-user", &root_uri).expect("init local workspace");
+
+        let response = app()
+            .oneshot(
+                Request::builder()
+                    .uri(format!(
+                        "/api/tree/projections/sidebar?workspaceId=local-ws:dev-user:my-space&sourceKind=local_folder&rootUri={root_uri}&parentRelativePath=design"
+                    ))
+                    .header("x-mnote-actor-id", "dev-user")
+                    .header("x-mnote-actor-type", "user")
+                    .body(Body::empty())
+                    .expect("request"),
+            )
+            .await
+            .expect("response");
+
+        assert_eq!(response.status(), StatusCode::OK);
+        let body = to_bytes(response.into_body(), usize::MAX)
+            .await
+            .expect("body");
+        let payload: Value = serde_json::from_slice(&body).expect("json");
+        let items = payload["result"]["items"].as_array().expect("items");
+        let titles = items
+            .iter()
+            .filter_map(|item| item["title"].as_str())
+            .collect::<Vec<_>>();
+        assert_eq!(payload["result"]["parentRelativePath"], "design");
+        assert!(titles.contains(&"Brief"));
+        assert!(!titles.contains(&"Home"));
+        assert!(!titles.contains(&"Other"));
+
+        let _ = std::fs::remove_dir_all(&root);
+    }
+
     #[tokio::test]
     async fn local_folder_file_projection_can_load_direct_children_by_parent_path() {
         let root = std::env::temp_dir().join(format!(