feat(desktop): list descendant notes when collapsed

apps/desktop/src/renderer/components/sidebar/NotebookItem.tsx

@@ -11,6 +11,7 @@ import {
   GripVertical,
 } from 'lucide-react';
 import type { NotebookTreeNode } from '../../../preload/index';
+import { useNotebookExpandStore } from '../../stores/notebookExpandStore';
 import { CommitHistory } from '../git/CommitHistory';
 import { sc } from './sc';
 
@@ -62,7 +63,9 @@ export const NotebookItem = memo(function NotebookItem({
   onReorder,
   siblingIds,
 }: NotebookItemProps) {
-  const [isExpanded, setIsExpanded] = useState(true);
+  const isExpanded = useNotebookExpandStore(s => !s.collapsedIds.includes(node.notebook.id));
+  const toggleExpanded = useNotebookExpandStore(s => s.toggle);
+  const expandNotebook = useNotebookExpandStore(s => s.expand);
   const [isEditing, setIsEditing] = useState(false);
   const [editName, setEditName] = useState(node.notebook.name);
   const [isGitEnabled, setIsGitEnabled] = useState(false);
@@ -103,10 +106,13 @@ export const NotebookItem = memo(function NotebookItem({
     [node.notebook.id, onSelect]
   );
 
-  const handleToggle = useCallback((e: React.MouseEvent) => {
-    e.stopPropagation();
-    setIsExpanded(prev => !prev);
-  }, []);
+  const handleToggle = useCallback(
+    (e: React.MouseEvent) => {
+      e.stopPropagation();
+      toggleExpanded(node.notebook.id);
+    },
+    [node.notebook.id, toggleExpanded]
+  );
 
   const handleDoubleClick = useCallback(
     (e: React.MouseEvent) => {
@@ -287,7 +293,7 @@ export const NotebookItem = memo(function NotebookItem({
       if (pos === 'inside') {
         // Move dragged notebook into this one as a child
         onMove?.(draggedId, node.notebook.id);
-        setIsExpanded(true);
+        expandNotebook(node.notebook.id);
       } else if (pos === 'above' || pos === 'below') {
         const fromSameParent =
           (draggedParentId === 'root' ? null : draggedParentId) === thisParentId;
@@ -313,6 +319,7 @@ export const NotebookItem = memo(function NotebookItem({
       onMove,
       onReorder,
       siblingIds,
+      expandNotebook,
     ]
   );
 

apps/desktop/src/renderer/data/nowBoard.md

@@ -75,6 +75,7 @@ Shipped this week:
 - Note templates: Meeting, Decision, Daily, Weekly, Reading, Issue (notebook `templates`).
 - What’s New is authored (`docs/releases/`). Promotion PRs: `chore(release): promote X.Y.Z`.
 - Workspace view: click a notebook to focus the sidebar on that tree. Escape or the breadcrumb home returns to All Notes.
+- Collapsed notebooks list notes from their descendants; expanded ones stay direct-only.
 
 CSS path (decided 2026-08-17):
 Keep CSS modules + tokens. Do not add Tailwind to desktop.

apps/desktop/src/renderer/hooks/useNavigation.ts

@@ -20,7 +20,8 @@ import {
   type SortOrder,
 } from '../stores/navigationStore';
 import { listOptionsFromNav } from '../utils/listOptionsFromNav';
-import { collectNotebookSubtreeIds } from '../utils/notebookTree';
+import { collectNotebookSubtreeIds, findNotebookNode } from '../utils/notebookTree';
+import { useNotebookExpandStore } from '../stores/notebookExpandStore';
 import { useNotes, useNoteCounts, useScopedNoteCounts, withExcerpt } from './useNotes';
 import { useNotebookTree, getNotebookPath, getAncestorIds } from './useNotebooks';
 
@@ -139,6 +140,15 @@ export function useFilteredNotes(): NoteWithExcerpt[] {
   const sortOrder = useSortOrder();
   const workspaceListAll = useWorkspaceListAll();
   const workspaceNotebookIds = useWorkspaceNotebookIds();
+  const collapsedIds = useNotebookExpandStore(s => s.collapsedIds);
+  const { data: tree } = useNotebookTree();
+  const descendantNotebookIds = useMemo(() => {
+    if (navigation.kind !== 'notebook') return undefined;
+    if (!collapsedIds.includes(navigation.id)) return undefined;
+    const node = findNotebookNode(tree ?? [], navigation.id);
+    if (!node || node.children.length === 0) return undefined;
+    return collectNotebookSubtreeIds(tree ?? [], navigation.id);
+  }, [navigation, collapsedIds, tree]);
 
   const options = useMemo(
     () =>
@@ -150,8 +160,18 @@ export function useFilteredNotes(): NoteWithExcerpt[] {
         sortOrder,
         workspaceNotebookIds,
         workspaceListAll,
+        descendantNotebookIds,
       }),
-    [navigation, statusFilter, tagFilter, sortBy, sortOrder, workspaceNotebookIds, workspaceListAll]
+    [
+      navigation,
+      statusFilter,
+      tagFilter,
+      sortBy,
+      sortOrder,
+      workspaceNotebookIds,
+      workspaceListAll,
+      descendantNotebookIds,
+    ]
   );
   const { data: notes } = useNotes(options);
 

apps/desktop/src/renderer/stores/__tests__/notebookExpandStore.test.ts

@@ -0,0 +1,19 @@
+import { describe, expect, it, beforeEach } from 'vitest';
+import { useNotebookExpandStore } from '../notebookExpandStore';
+
+describe('notebookExpandStore', () => {
+  beforeEach(() => {
+    useNotebookExpandStore.setState({ collapsedIds: [] });
+  });
+
+  it('treats notebooks as expanded by default', () => {
+    expect(useNotebookExpandStore.getState().isExpanded('work')).toBe(true);
+  });
+
+  it('toggles collapse', () => {
+    useNotebookExpandStore.getState().toggle('work');
+    expect(useNotebookExpandStore.getState().isExpanded('work')).toBe(false);
+    useNotebookExpandStore.getState().toggle('work');
+    expect(useNotebookExpandStore.getState().isExpanded('work')).toBe(true);
+  });
+});

apps/desktop/src/renderer/stores/notebookExpandStore.ts

@@ -0,0 +1,24 @@
+import { create } from 'zustand';
+
+/** Notebooks default to expanded. This set is the collapsed ones. */
+interface NotebookExpandStore {
+  collapsedIds: string[];
+  isExpanded: (id: string) => boolean;
+  toggle: (id: string) => void;
+  expand: (id: string) => void;
+}
+
+export const useNotebookExpandStore = create<NotebookExpandStore>((set, get) => ({
+  collapsedIds: [],
+  isExpanded: id => !get().collapsedIds.includes(id),
+  toggle: id =>
+    set(state => ({
+      collapsedIds: state.collapsedIds.includes(id)
+        ? state.collapsedIds.filter(item => item !== id)
+        : [...state.collapsedIds, id],
+    })),
+  expand: id =>
+    set(state => ({
+      collapsedIds: state.collapsedIds.filter(item => item !== id),
+    })),
+}));

apps/desktop/src/renderer/utils/__tests__/listOptionsFromNav.test.ts

@@ -98,6 +98,22 @@ describe('listOptionsFromNav', () => {
       });
     });
 
+    it('includes descendant notebooks when the selected parent is collapsed', () => {
+      expect(
+        listOptionsFromNav({
+          navigation: { kind: 'notebook', id: 'work' },
+          statusFilter: null,
+          tagFilter: null,
+          descendantNotebookIds: ['work', 'api', 'web'],
+        })
+      ).toEqual({
+        notebookIds: ['work', 'api', 'web'],
+        archived: 'active',
+        isDeleted: false,
+        limit: 10000,
+      });
+    });
+
     it('scopes sidebar counts to the workspace tree', () => {
       expect(
         listOptionsFromNav({

apps/desktop/src/renderer/utils/listOptionsFromNav.ts

@@ -20,6 +20,8 @@ export function listOptionsFromNav(input: {
   workspaceListAll?: boolean;
   /** Sidebar counts: always the workspace tree when focused. */
   scopeToWorkspaceTree?: boolean;
+  /** Selected notebook subtree when that notebook is collapsed. */
+  descendantNotebookIds?: string[];
 }): ListOptions {
   const options: ListOptions = {
     ...optionsForNavigation(input.navigation, input),
@@ -51,6 +53,7 @@ function optionsForNavigation(
     workspaceNotebookIds?: string[];
     workspaceListAll?: boolean;
     scopeToWorkspaceTree?: boolean;
+    descendantNotebookIds?: string[];
   }
 ): ListOptions {
   switch (navigation.kind) {
@@ -80,6 +83,14 @@ function optionsForNavigation(
           isDeleted: false,
         };
       }
+      const descendants = input.descendantNotebookIds;
+      if (descendants && descendants.length > 1) {
+        return {
+          notebookIds: descendants,
+          archived: 'active',
+          isDeleted: false,
+        };
+      }
       return {
         notebookId: navigation.id,
         archived: 'active',

docs/NOW.md

@@ -75,6 +75,7 @@ Shipped this week:
 - Note templates: Meeting, Decision, Daily, Weekly, Reading, Issue (notebook `templates`).
 - What’s New is authored (`docs/releases/`). Promotion PRs: `chore(release): promote X.Y.Z`. See `docs/WHATS_NEW.md`.
 - Workspace view: click a notebook to focus the sidebar on that tree. Escape or the breadcrumb home returns to All Notes.
+- Collapsed notebooks list notes from their descendants; expanded ones stay direct-only.
 
 CSS path (decided 2026-08-17):
 Keep CSS modules + tokens. Do not add Tailwind to desktop.