fix: 外部导入笔记后自动刷新侧栏

Co-Authored-By: Codex <noreply@anthropic.com>

e2e/external-edit.test.ts

@@ -394,6 +394,31 @@ test("polling still delivers external edits when /.events is unavailable", async
   expect(eventsRequestCount).toBe(1);
 });
 
+test("external Markdown folders appear in the open sidebar after indexing", async ({
+  sbPage,
+  sbServer,
+}) => {
+  const importedFolder = "极空间记事本";
+  const sidebar = sbPage.getByRole("complementary", {
+    name: "Plainleaf 导航",
+  });
+  await expect(sidebar.getByText(importedFolder, { exact: true })).toHaveCount(
+    0,
+  );
+
+  await mkdir(join(sbServer.spaceDir, importedFolder), { recursive: true });
+  await writeFile(
+    join(sbServer.spaceDir, importedFolder, "导入示例.md"),
+    "# 导入示例\n",
+  );
+
+  // The regular file-list scan detects and indexes the new file. Once that
+  // batch drains, the page-list cache must refresh without a browser reload.
+  await expect(
+    sidebar.getByText(importedFolder, { exact: true }),
+  ).toBeVisible({ timeout: 15_000 });
+});
+
 test("reconnects with backoff after a transient connection failure", async ({
   page,
   sbServer,