diff --git a/bugs/05-editor-mainline/done/5-34-starred-scope-pagetree-and-local-edit-save-v1.md b/bugs/05-editor-mainline/done/5-34-starred-scope-pagetree-and-local-edit-save-v1.md
new file mode 100644
index 00000000..89605d52
--- /dev/null
+++ b/bugs/05-editor-mainline/done/5-34-starred-scope-pagetree-and-local-edit-save-v1.md
@@ -0,0 +1,24 @@
+# 5-34 [done] 星标 scoped 文件夹 PageTree 错位与本地 Markdown 编辑不保存
+
+## 现象
+
+- 点击星标置顶的本地 `design` 文件夹后，FileTree 已切到 `design` scope，但 PageTree 仍显示旧 workspace/root 页面树或为空。
+- 在“我的空间”本地 Markdown 页面输入 `111` 后，切换页面再回来内容消失。
+
+## 根因
+
+- 星标文件夹打开时，`/api/tree/projections/file` 已带 `parentRelativePath=design`，但 `/api/tree/projections/sidebar` 没有带同一 scope；后端 PageTree projection 也没有按 `parentRelativePath` 扫描子目录。
+- `document-session-runtime.js` 拆分后继续直接使用 `hydrateMindmapAttrsFromDom` / `textToTiptapDocument`，但文件自身未导入这两个 conversion helper。编辑器变更能进入 dirty session，但保存计时器执行时抛出 `hydrateMindmapAttrsFromDom is not defined`，导致 `/api/page-body/write` 根本没有发出。
+
+## 修复
+
+- 星标 scoped folder 打开时同时给 sidebar projection 传 `parentRelativePath`，并确保 cloud/default 页面缺少 `#sidebar-tree-root` 时能在 PageTree panel 内创建 scoped PageTree host。
+- 后端新增 scoped local PageTree snapshot：按 `rootUri + parentRelativePath` 扫描并缓存，`/api/tree/projections/sidebar` 在 local folder + `parentRelativePath` 下返回 scoped PageTree。
+- `document-session-runtime.js` 显式导入 `hydrateMindmapAttrsFromDom` 与 `textToTiptapDocument`，恢复 dirty session 自动保存链路。
+
+## 验证
+
+- RED：`node scripts/task498-starred-page-tree-scope-and-local-edit-smoke.js` 先失败于 scoped PageTree 未显示 `Brief`，修复 PageTree scope 后再失败于保存阶段 `hydrateMindmapAttrsFromDom is not defined`。
+- GREEN：`node scripts/task498-starred-page-tree-scope-and-local-edit-smoke.js` 通过，覆盖星标 `design` 后 PageTree 只显示 design 内 Markdown、输入 `111` 后 `/api/page-body/write` 成功、磁盘 `Home.md` 包含 `111`、切到 `Other.md` 再回 `Home.md` 仍保留。
+- 回归：`node scripts/task492-sidebar-starred-shortcuts-smoke.js`、`node scripts/task494-filetree-lazy-loading-dedup-smoke.js`、`node scripts/task497-local-page-tree-filetree-open-performance-smoke.js` 通过。
+- Rust：`local_folder_page_projection_can_scope_by_parent_path`、`local_folder_page_tree_snapshot_reuses_cache_until_watch_revision_changes`、`tree_projection_routes` 通过。
diff --git a/design/05-editor-mainline/process/5-32-filetree-lazy-loading-sidex-alignment-v1.md b/design/05-editor-mainline/process/5-32-filetree-lazy-loading-sidex-alignment-v1.md
index b4a4aea2..507d9c2b 100644
--- a/design/05-editor-mainline/process/5-32-filetree-lazy-loading-sidex-alignment-v1.md
+++ b/design/05-editor-mainline/process/5-32-filetree-lazy-loading-sidex-alignment-v1.md
@@ -67,6 +67,7 @@
 - [x] 新增 `task497-local-page-tree-filetree-open-performance-smoke.js`：用真实 Chromium 从首页进入本地 workspace，点击星标 `design` 文件夹，再通过 Explorer 逐级打开 `design/05-editor-mainline/process/5-32-filetree-lazy-loading-sidex-alignment-v1.md`；记录 sidebar/filetree/page aggregate/editor ready 时序、network/resource timing、long task，并保存打开前后截图。
 - [x] `task497` 不允许只用 `context.request.fetch` 或直接 `page.goto(最终文档 URL)` 作为主验收；可以用 direct request 作为对照指标，但真实验收必须来自 UI 点击路径。
 - [x] `task497` 断言打开过程中旧“我的空间”页面树不会长期残留、scoped FileTree 先可交互、editor surface 可见，且目标 md 打开不会因为 page tree projection 全量重建而明显延迟。
+- [x] 新增 `task498-starred-page-tree-scope-and-local-edit-smoke.js`：覆盖星标 scoped folder 打开后 PageTree 使用同一 scope，且本地 Markdown 输入 `111` 后经 `/api/page-body/write` 保存，切页再回不丢内容。
 - [x] `gateway.rs` 本地 root 分支复用已加载的 page tree snapshot，避免同一请求重复调用 `load_local_folder_page_tree_snapshot(root_uri)`。
 - [x] `sidebar-tree-runtime.js` 星标文件夹打开改为并行请求 sidebar projection 与 scoped file projection；file projection 可以先应用，sidebar projection 后补页面树。
 - [x] `sidebar-tree-live-apply-runtime.js` 拆出 page/file projection 独立 apply，并为二者加入 generation / stale guard。
@@ -354,6 +355,8 @@ scripts/task494-filetree-lazy-loading-dedup-smoke.js
 - 2026-05-26：`codegraph sync .` 已执行；`codegraph status .` 仍报告 `Pending Changes: Added: 5 files`，属于当前工作树既有未提交/新增文件状态，本轮不清理。
 - 2026-05-27：`task492` RED 先失败于星标文件夹等待 sidebar projection，GREEN 后 `node scripts/task492-sidebar-starred-shortcuts-smoke.js` 通过，确认 scoped FileTree 先于延迟页面树可交互。
 - 2026-05-27：`task497` RED 先失败于真实点击星标 `design` 后 scoped FileTree 未先完成；GREEN 后 `node scripts/task497-local-page-tree-filetree-open-performance-smoke.js` 通过。最终样本：`filetreeInteractiveAt=1779857492435`，`targetClickAt=1779857492621`，`pageAggregateResponseAt=1779857492667`，`editorVisibleAt=1779857492823`，`longTasks=[]`，`directDocumentMs=8`；截图保存在 `tmp/task497-local-page-tree-filetree-open-performance-smoke/`。
+- 2026-05-27：`task498` RED 先失败于星标 `design` 后 PageTree 为空 / 未按 scope 替换；补 scoped `/api/tree/projections/sidebar?parentRelativePath=design` 后进入保存段，再 RED 失败于 `hydrateMindmapAttrsFromDom is not defined`，确认 dirty session 保存计时器抛错导致 `/api/page-body/write` 未发出。GREEN 后 `node scripts/task498-starred-page-tree-scope-and-local-edit-smoke.js` 通过，覆盖 PageTree scope、保存到磁盘、切换 `Other.md` 再回 `Home.md` 仍保留 `111`。
+- 2026-05-27：复跑 `node scripts/task497-local-page-tree-filetree-open-performance-smoke.js` 通过。最终样本：`filetreeInteractiveAt=1779860840801`，`targetClickAt=1779860840985`，`pageAggregateResponseAt=1779860841032`，`editorVisibleAt=1779860841196`，`longTasks=[]`，`directDocumentMs=7`；scoped PageTree 断言改为检查 design scope 内本地页面行，而不是要求父目录名 `design` 必须作为可见行出现。
 - 2026-05-27：Rust filters 通过：`root_entry_local_folder_reuses_page_tree_snapshot_for_sidebar_html`、`sidebar_runtime_applies_page_projection_with_generation_and_yield`、`sidebar_filetree_runtime`、`local_folder_file_projection`、`tree_projection_routes`、`local_folder_file_tree_children_snapshot_scans_parent_once`、`local_folder_page_tree_snapshot_reuses_cache_until_watch_revision_changes`。
 - 2026-05-27：`node scripts/task494-filetree-lazy-loading-dedup-smoke.js` 通过，`targetChildrenRequests=1`，`staleScopeChildrenRequests=1`，`cachedExpandMs=33`。
 
diff --git a/rust/crates/mnote-web/browser/document-session-runtime.js b/rust/crates/mnote-web/browser/document-session-runtime.js
index 0671c8f7..40050a4a 100644
--- a/rust/crates/mnote-web/browser/document-session-runtime.js
+++ b/rust/crates/mnote-web/browser/document-session-runtime.js
@@ -2,9 +2,11 @@ import {
   conflictDetectionKeyFromBody,
   editorDocumentFromTiptapDocument,
   flattenText,
+  hydrateMindmapAttrsFromDom,
   legacyBlocksFromEditorDocument,
   pageBodyTiptapDocument,
   revisionFromConflictKey,
+  textToTiptapDocument,
   toTiptapDocument,
 } from './document-tiptap-conversion-runtime.js';
 
diff --git a/rust/crates/mnote-web/browser/sidebar-tree-runtime.js b/rust/crates/mnote-web/browser/sidebar-tree-runtime.js
index c54198ea..2523108b 100644
--- a/rust/crates/mnote-web/browser/sidebar-tree-runtime.js
+++ b/rust/crates/mnote-web/browser/sidebar-tree-runtime.js
@@ -687,6 +687,23 @@ import { createSidebarPageSettingsRuntime } from './sidebar-page-settings-runtim
     return root;
   }
 
+  function ensureStarredFolderPageTreeHost(workspaceId) {
+    var root = document.getElementById('sidebar-tree-root');
+    if (root instanceof HTMLElement) return root;
+    var panel = document.getElementById('wolai-sidebar-page-tree-panel') || document.querySelector('[data-mnote-sidebar-tree-panel="page"]');
+    if (!(panel instanceof HTMLElement)) return null;
+    var section = document.createElement('div');
+    section.className = 'sidebar-tree-section';
+    root = document.createElement('div');
+    root.id = 'sidebar-tree-root';
+    root.className = 'sidebar-tree';
+    root.setAttribute('data-tree-shell-mode', 'page');
+    if (workspaceId) root.setAttribute('data-workspace-id', workspaceId);
+    section.appendChild(root);
+    panel.appendChild(section);
+    return root;
+  }
+
   function persistStarredFolderScope(workspaceId, rootUri, relativePath) {
     var targetUrl = new URL(window.location.href);
     if (workspaceId) targetUrl.searchParams.set('workspaceId', workspaceId);
@@ -719,17 +736,23 @@ import { createSidebarPageSettingsRuntime } from './sidebar-page-settings-runtim
     var tab = document.querySelector('[data-mnote-sidebar-tree-tab="filetree"]');
     if (tab instanceof HTMLElement) switchSidebarTreeTab(tab);
     var root = ensureStarredFolderFileTreeHost(workspaceId);
+    var pageRoot = ensureStarredFolderPageTreeHost(workspaceId);
     if (root instanceof HTMLElement) {
       root.setAttribute('data-workspace-id', workspaceId);
       root.setAttribute('data-mnote-filetree-scope', relativePath);
       root.setAttribute('data-mnote-filetree-scope-title', row.textContent ? row.textContent.trim() : relativePath);
     }
+    if (pageRoot instanceof HTMLElement) {
+      pageRoot.setAttribute('data-workspace-id', workspaceId);
+      pageRoot.setAttribute('data-mnote-page-tree-scope', relativePath);
+    }
     persistStarredFolderScope(workspaceId, rootUri, relativePath);
     document.documentElement.setAttribute('data-mnote-filetree-scope', relativePath);
     var sidebarUrl = new URL('/api/tree/projections/sidebar', window.location.origin);
     sidebarUrl.searchParams.set('workspaceId', workspaceId);
     sidebarUrl.searchParams.set('sourceKind', 'local_folder');
     sidebarUrl.searchParams.set('rootUri', rootUri);
+    sidebarUrl.searchParams.set('parentRelativePath', relativePath);
     var url = new URL('/api/tree/projections/file', window.location.origin);
     url.searchParams.set('workspaceId', workspaceId);
     url.searchParams.set('sourceKind', 'local_folder');
diff --git a/rust/crates/mnote-web/src/routes/kernel.rs b/rust/crates/mnote-web/src/routes/kernel.rs
index ecc3d8f5..110008ca 100644
--- a/rust/crates/mnote-web/src/routes/kernel.rs
+++ b/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!(
diff --git a/rust/crates/mnote-web/src/routes/local_folder_source.rs b/rust/crates/mnote-web/src/routes/local_folder_source.rs
index a60240a1..73b697b5 100644
--- a/rust/crates/mnote-web/src/routes/local_folder_source.rs
+++ b/rust/crates/mnote-web/src/routes/local_folder_source.rs
@@ -2767,6 +2767,20 @@ fn load_local_folder_file_tree_scope_snapshot(
 
 pub fn load_local_folder_page_tree_snapshot(
     root_uri: &str,
+) -> Result<ProjectionSnapshot, WebError> {
+    load_local_folder_page_tree_snapshot_for_scope(root_uri, None)
+}
+
+pub fn load_local_folder_page_tree_scope_snapshot(
+    root_uri: &str,
+    parent_relative_path: &str,
+) -> Result<ProjectionSnapshot, WebError> {
+    load_local_folder_page_tree_snapshot_for_scope(root_uri, Some(parent_relative_path))
+}
+
+fn load_local_folder_page_tree_snapshot_for_scope(
+    root_uri: &str,
+    parent_relative_path: Option<&str>,
 ) -> Result<ProjectionSnapshot, WebError> {
     #[cfg(test)]
     LOCAL_PAGE_TREE_SNAPSHOT_TEST_LOADS.fetch_add(1, std::sync::atomic::Ordering::SeqCst);
@@ -2787,9 +2801,25 @@ pub fn load_local_folder_page_tree_snapshot(
 
     let workspace_id = local_workspace_id(&canonical_root);
     let root_source_uri = file_uri_for_path(&canonical_root);
+    let parent_relative_path = parent_relative_path
+        .map(str::trim)
+        .filter(|value| !value.is_empty() && *value != ".")
+        .unwrap_or("");
+    let scan_root = if parent_relative_path.is_empty() {
+        canonical_root.clone()
+    } else {
+        resolve_metadata_relative_path(&canonical_root, parent_relative_path)?
+    };
+    if !scan_root.is_dir() {
+        return Err(WebError::bad_request_code(
+            "local_folder_parent_not_directory",
+            "PageTree scope parentRelativePath 必须指向目录",
+        ));
+    }
     let watch_revision = local_folder_watch_revision_for_root(&canonical_root, &root_source_uri)?;
+    let cache_key = format!("{root_source_uri}\n{parent_relative_path}");
     if let Ok(cache) = local_page_tree_snapshot_cache().lock() {
-        if let Some(entry) = cache.get(&root_source_uri) {
+        if let Some(entry) = cache.get(&cache_key) {
             if entry.watch_revision.revision == watch_revision.revision
                 && entry.watch_revision.entry_count == watch_revision.entry_count
                 && entry.watch_revision.latest_modified_ms == watch_revision.latest_modified_ms
@@ -2804,7 +2834,7 @@ pub fn load_local_folder_page_tree_snapshot(
     LOCAL_PAGE_TREE_SNAPSHOT_SCAN_TEST_LOADS.fetch_add(1, std::sync::atomic::Ordering::SeqCst);
     scan_markdown_page_tree(
         &canonical_root,
-        &canonical_root,
+        &scan_root,
         None,
         0,
         None,
@@ -2859,6 +2889,7 @@ pub fn load_local_folder_page_tree_snapshot(
             "projection": "page_tree",
             "sourceKind": "local_folder",
             "rootUri": root_source_uri,
+            "parentRelativePath": parent_relative_path,
             "watchRevision": watch_revision,
             "items": items,
         }),
@@ -2868,7 +2899,7 @@ pub fn load_local_folder_page_tree_snapshot(
             cache.clear();
         }
         cache.insert(
-            root_source_uri,
+            cache_key,
             LocalPageTreeSnapshotCacheEntry {
                 watch_revision,
                 snapshot: snapshot.clone(),
diff --git a/scripts/task497-local-page-tree-filetree-open-performance-smoke.js b/scripts/task497-local-page-tree-filetree-open-performance-smoke.js
index 44502148..f81ae224 100644
--- a/scripts/task497-local-page-tree-filetree-open-performance-smoke.js
+++ b/scripts/task497-local-page-tree-filetree-open-performance-smoke.js
@@ -324,7 +324,7 @@ async function main() {
       if (!(root instanceof HTMLElement)) return false;
       const stale = root.querySelectorAll('.tree-row[data-shell-mode="page"][data-node-id="stale-my-space-page"]').length;
       const localRows = root.querySelectorAll('.tree-row[data-shell-mode="page"]').length;
-      return stale === 0 && localRows > 0 && /design/.test(root.innerText || "");
+      return stale === 0 && localRows > 0 && /05-editor-mainline|04-tree-domain|5-32 target|Reference|Other/.test(root.innerText || "");
     }, { timeout: UI_TIMEOUT_MS });
     const staleRowsAfterStarredOpen = await page.locator('#sidebar-tree-root .tree-row[data-shell-mode="page"][data-node-id="stale-my-space-page"]').count();
     assert.equal(staleRowsAfterStarredOpen, 0, "星标 design 打开后旧我的空间页面树不应长期残留");
diff --git a/scripts/task498-starred-page-tree-scope-and-local-edit-smoke.js b/scripts/task498-starred-page-tree-scope-and-local-edit-smoke.js
new file mode 100644
index 00000000..4602211e
--- /dev/null
+++ b/scripts/task498-starred-page-tree-scope-and-local-edit-smoke.js
@@ -0,0 +1,278 @@
+#!/usr/bin/env node
+"use strict";
+
+const assert = require("node:assert/strict");
+const fs = require("node:fs");
+const http = require("node:http");
+const net = require("node:net");
+const os = require("node:os");
+const path = require("node:path");
+const { spawn } = require("node:child_process");
+const { chromium } = require("playwright");
+
+const TASK = "task498-starred-page-tree-scope-and-local-edit-smoke";
+const UI_TIMEOUT_MS = Number(process.env.MNOTE_SMOKE_UI_TIMEOUT_MS || 35_000);
+const TEST_PASSWORD = process.env.MNOTE_E2E_PASSWORD || ["Mnote", "E2E", "123!"].join("");
+
+function resolveChromiumExecutablePath() {
+  const explicit = process.env.PLAYWRIGHT_CHROMIUM_EXECUTABLE_PATH || "";
+  if (explicit && fs.existsSync(explicit)) return explicit;
+  return [
+    "/usr/bin/google-chrome-stable",
+    "/usr/bin/google-chrome",
+    "/snap/bin/chromium",
+    "/usr/bin/chromium",
+    "/usr/bin/chromium-browser",
+  ].find((candidate) => fs.existsSync(candidate)) || "";
+}
+
+function pickPort() {
+  return new Promise((resolve, reject) => {
+    const server = net.createServer();
+    server.listen(0, "127.0.0.1", () => {
+      const address = server.address();
+      const port = address && typeof address === "object" ? address.port : 0;
+      server.close(() => resolve(port));
+    });
+    server.on("error", reject);
+  });
+}
+
+function waitForHttpOk(url, timeoutMs) {
+  const deadline = Date.now() + timeoutMs;
+  return new Promise((resolve, reject) => {
+    const retry = () => {
+      if (Date.now() > deadline) {
+        reject(new Error(`server_not_ready: ${url}`));
+        return;
+      }
+      setTimeout(tick, 250);
+    };
+    const tick = () => {
+      const request = http.get(url, (response) => {
+        response.resume();
+        if (response.statusCode >= 200 && response.statusCode < 500) {
+          resolve();
+          return;
+        }
+        retry();
+      });
+      request.on("error", retry);
+      request.setTimeout(1000, () => {
+        request.destroy();
+        retry();
+      });
+    };
+    tick();
+  });
+}
+
+function fileUrlToPath(value) {
+  const url = new URL(value);
+  return decodeURIComponent(url.pathname);
+}
+
+async function signUp(context, baseUrl, actorId) {
+  const response = await context.request.fetch(`${baseUrl}/api/auth`, {
+    method: "POST",
+    data: {
+      action: "auth:signIn",
+      args: {
+        provider: "password",
+        params: {
+          email: `${actorId}@example.com`,
+          username: actorId,
+          name: actorId,
+          password: TEST_PASSWORD,
+          flow: "signUp",
+        },
+      },
+    },
+  });
+  assert(response.ok(), `测试账号注册失败: ${response.status()} ${await response.text()}`);
+}
+
+async function openDefaultLocalWorkspace(page, baseUrl) {
+  await page.goto(baseUrl, { waitUntil: "domcontentloaded", timeout: UI_TIMEOUT_MS });
+  const createButton = page.locator('[data-testid="mnote-create-default-local-workspace"]').first();
+  if (await createButton.isVisible({ timeout: 3000 }).catch(() => false)) {
+    await createButton.click({ timeout: UI_TIMEOUT_MS });
+    await page.waitForURL((url) => url.searchParams.get("sourceKind") === "local_folder", {
+      timeout: UI_TIMEOUT_MS,
+    });
+  }
+  const url = new URL(page.url());
+  const rootUri = url.searchParams.get("rootUri")
+    || await page.evaluate(() => document.body.getAttribute("data-mnote-root-uri") || "");
+  assert(rootUri, "应进入 local_folder workspace");
+  return {
+    rootUri,
+    workspaceId: url.searchParams.get("workspaceId") || "",
+  };
+}
+
+async function openLocalDocument(page, baseUrl, rootUri, workspaceId, documentId) {
+  const url = new URL(`/documents/${encodeURIComponent(documentId)}`, baseUrl);
+  if (workspaceId) url.searchParams.set("workspaceId", workspaceId);
+  url.searchParams.set("sourceKind", "local_folder");
+  url.searchParams.set("rootUri", rootUri);
+  url.searchParams.set("treeView", "filetree");
+  await page.goto(url.toString(), { waitUntil: "domcontentloaded", timeout: UI_TIMEOUT_MS });
+  await page.locator(".document-pane[data-pane-role='primary'] .editor-surface .ProseMirror[contenteditable='true']").first().waitFor({
+    state: "visible",
+    timeout: UI_TIMEOUT_MS,
+  });
+}
+
+async function readEditorText(page) {
+  return page.locator(".document-pane[data-pane-role='primary'] .editor-surface .ProseMirror").first().innerText({
+    timeout: UI_TIMEOUT_MS,
+  });
+}
+
+async function main() {
+  const port = await pickPort();
+  const baseUrl = `http://127.0.0.1:${port}`;
+  const dataRoot = fs.mkdtempSync(path.join(os.tmpdir(), `${TASK}-`));
+  const dbPath = path.join(dataRoot, "control-plane.sqlite3");
+  const actorId = `${TASK}-${process.pid}-${Date.now()}`;
+  const server = spawn("cargo", ["run", "-p", "mnote-web", "--bin", "mnote-web"], {
+    cwd: path.join(__dirname, "..", "rust"),
+    env: {
+      ...process.env,
+      MNOTE_WEB_BIND: `127.0.0.1:${port}`,
+      MNOTE_WEB_PUBLIC_BIND: `127.0.0.1:${port}`,
+      MNOTE_WEB_ENABLE_LEGACY_NEXT_COMPAT: "0",
+      MNOTE_CONTROL_PLANE_DB_PATH: dbPath,
+      MNOTE_LOCAL_WORKSPACE_BASE_DIR: dataRoot,
+      CONVEX_SELF_HOSTED_URL: "http://127.0.0.1:9",
+      NEXT_PUBLIC_CONVEX_URL: "http://127.0.0.1:9",
+    },
+    stdio: ["ignore", "pipe", "pipe"],
+  });
+  let stderr = "";
+  server.stderr.on("data", (chunk) => {
+    stderr += chunk.toString();
+  });
+
+  const executablePath = resolveChromiumExecutablePath();
+  const browser = await chromium.launch({
+    headless: true,
+    ...(executablePath ? { executablePath } : {}),
+  });
+  const context = await browser.newContext({ viewport: { width: 1360, height: 920 } });
+  const page = await context.newPage();
+  const diagnostics = [];
+  page.on("console", (message) => diagnostics.push(`console:${message.type()}:${message.text()}`));
+  page.on("pageerror", (error) => diagnostics.push(`pageerror:${error.message}`));
+
+  try {
+    await waitForHttpOk(`${baseUrl}/health`, 60_000);
+    await signUp(context, baseUrl, actorId);
+    const { rootUri, workspaceId } = await openDefaultLocalWorkspace(page, baseUrl);
+    const rootPath = fileUrlToPath(rootUri);
+    fs.mkdirSync(path.join(rootPath, "design"), { recursive: true });
+    fs.writeFileSync(path.join(rootPath, "Home.md"), "# Home\n\noriginal\n", "utf8");
+    fs.writeFileSync(path.join(rootPath, "Other.md"), "# Other\n\nother\n", "utf8");
+    fs.writeFileSync(path.join(rootPath, "design", "Brief.md"), "# Brief\n\nbrief\n", "utf8");
+
+    const fileTreeUrl = new URL(baseUrl);
+    if (workspaceId) fileTreeUrl.searchParams.set("workspaceId", workspaceId);
+    fileTreeUrl.searchParams.set("sourceKind", "local_folder");
+    fileTreeUrl.searchParams.set("rootUri", rootUri);
+    fileTreeUrl.searchParams.set("treeView", "filetree");
+    await page.goto(fileTreeUrl.toString(), { waitUntil: "domcontentloaded", timeout: UI_TIMEOUT_MS });
+    await page.locator('[data-mnote-sidebar-tree-tab="filetree"]').click({ timeout: UI_TIMEOUT_MS });
+    const designRow = page.locator('#sidebar-file-tree-root .tree-row[data-shell-mode="filetree"][data-local-relative-path="design"]').first();
+    await designRow.waitFor({ state: "visible", timeout: UI_TIMEOUT_MS });
+    await designRow.click({ button: "right", timeout: UI_TIMEOUT_MS });
+    await page.getByText("加入/取消星标置顶").click({ timeout: UI_TIMEOUT_MS });
+    await page.locator('.wolai-starred-section [data-mnote-shortcut-kind="folder"][data-mnote-shortcut-relative-path="design"]').first().waitFor({
+      state: "visible",
+      timeout: UI_TIMEOUT_MS,
+    });
+
+    const cloudUrl = new URL(baseUrl);
+    cloudUrl.searchParams.set("workspaceId", "default");
+    await page.goto(cloudUrl.toString(), { waitUntil: "domcontentloaded", timeout: UI_TIMEOUT_MS });
+    const designShortcut = page.locator('.wolai-starred-section [data-mnote-shortcut-kind="folder"][data-mnote-shortcut-relative-path="design"]').first();
+    await designShortcut.click({ timeout: UI_TIMEOUT_MS });
+    await page.locator('#sidebar-file-tree-root[data-mnote-filetree-scope="design"] .tree-row[data-local-relative-path="design/Brief.md"]').waitFor({
+      state: "visible",
+      timeout: UI_TIMEOUT_MS,
+    });
+    await page.waitForFunction(() => {
+      const root = document.querySelector("#sidebar-tree-root");
+      return root instanceof HTMLElement && /Brief/.test(root.innerText || "");
+    }, { timeout: UI_TIMEOUT_MS }).catch(async (error) => {
+      const state = await page.evaluate(() => {
+        const root = document.querySelector("#sidebar-tree-root");
+        return {
+          href: location.href,
+          pageTreeText: root instanceof HTMLElement ? root.innerText : "",
+          pageTreeHtml: root instanceof HTMLElement ? root.innerHTML.slice(0, 1000) : "",
+          fileTreeText: document.querySelector("#sidebar-file-tree-root")?.textContent || "",
+          fileTreeScope: document.querySelector("#sidebar-file-tree-root")?.getAttribute("data-mnote-filetree-scope") || "",
+        };
+      });
+      throw new Error(`${error.message}; state=${JSON.stringify(state)}; diagnostics=${diagnostics.slice(-20).join(" | ")}`);
+    });
+    const pageTreeText = await page.locator("#sidebar-tree-root").innerText({ timeout: UI_TIMEOUT_MS });
+    assert.match(pageTreeText, /Brief/, `星标 design 后页面树应显示 design 内 Markdown: ${pageTreeText}`);
+    assert.doesNotMatch(pageTreeText, /Home|Other/, `星标 design 后页面树不应显示根目录 Markdown: ${pageTreeText}`);
+
+    await openLocalDocument(page, baseUrl, rootUri, workspaceId, "local-md:Home.md");
+    const editor = page.locator(".document-pane[data-pane-role='primary'] .editor-surface .ProseMirror[contenteditable='true']").first();
+    await editor.click({ timeout: UI_TIMEOUT_MS });
+    await page.keyboard.press(process.platform === "darwin" ? "Meta+A" : "Control+A");
+    await page.keyboard.press("Backspace");
+    const saveResponsePromise = page.waitForResponse(async (response) => {
+      if (!response.url().includes("/api/page-body/write") || response.request().method() !== "POST") return false;
+      const payload = response.request().postDataJSON();
+      return payload?.documentId === "local-md:Home.md" && response.ok();
+    }, { timeout: UI_TIMEOUT_MS });
+    await page.keyboard.type("111", { delay: 10 });
+    await page.waitForFunction(
+      (expected) => (document.querySelector(".document-pane[data-pane-role='primary'] .editor-surface .ProseMirror")?.textContent || "").includes(expected),
+      "111",
+      { timeout: UI_TIMEOUT_MS },
+    );
+    const saveResponse = await saveResponsePromise.catch(async (error) => {
+      const state = await page.evaluate(() => ({
+        editorText: document.querySelector(".document-pane[data-pane-role='primary'] .editor-surface .ProseMirror")?.textContent || "",
+        status: document.querySelector("[data-runtime-editor-status]")?.getAttribute("data-runtime-editor-status") || "",
+        debugSessions: window.__mnoteDebugDocumentSessions?.snapshot?.() || null,
+      }));
+      throw new Error(`${error.message}; edit_state=${JSON.stringify(state)}; diagnostics=${diagnostics.slice(-20).join(" | ")}`);
+    });
+    assert(saveResponse.ok(), `本地 Markdown 保存失败: ${saveResponse.status()}`);
+    await page.waitForFunction(
+      (expected) => (document.querySelector(".editor-surface .ProseMirror")?.textContent || "").includes(expected),
+      "111",
+      { timeout: UI_TIMEOUT_MS },
+    );
+    assert.match(fs.readFileSync(path.join(rootPath, "Home.md"), "utf8"), /111/, "保存后磁盘 Home.md 应包含 111");
+
+    await openLocalDocument(page, baseUrl, rootUri, workspaceId, "local-md:Other.md");
+    await openLocalDocument(page, baseUrl, rootUri, workspaceId, "local-md:Home.md");
+    const reloadedText = await readEditorText(page);
+    assert.match(reloadedText, /111/, `切换页面再回 Home.md 后编辑内容应保留: ${reloadedText}`);
+
+    console.log(JSON.stringify({ ok: true, task: TASK, baseUrl }, null, 2));
+  } finally {
+    await browser.close();
+    server.kill("SIGINT");
+    fs.rmSync(dataRoot, { recursive: true, force: true });
+    if (server.exitCode == null) {
+      setTimeout(() => server.kill("SIGKILL"), 2000).unref();
+    }
+    if (server.exitCode && server.exitCode !== 130 && server.exitCode !== null) {
+      process.stderr.write(stderr);
+    }
+  }
+}
+
+main().catch((error) => {
+  console.error(error);
+  process.exit(1);
+});