fix: persist notebook tree expansion state

Refs #345

apps/web/src/components/NotebookPane.test.mjs

@@ -99,6 +99,19 @@ describe("NotebookPane sidebar collapse", () => {
   });
 });
 
+describe("NotebookPane tree expansion persistence", () => {
+  test("stores collapsed branches outside individual tree items", () => {
+    const treeItemSource = readFileSync(new URL("./NotebookTreeItem.tsx", import.meta.url), "utf8");
+
+    expect(source).toContain("readNotebookTreeCollapsedIdsPreference");
+    expect(source).toContain("writeNotebookTreeCollapsedIdsPreference(collapsedNotebookIds)");
+    expect(source).toContain("collapsedNotebookIds={collapsedNotebookIds}");
+    expect(treeItemSource).toContain("const open = !collapsedNotebookIds.has(node.id)");
+    expect(treeItemSource).not.toContain("const [open, setOpen] = useState(true)");
+    expect(treeItemSource).not.toContain("if (hasSelectedDescendant) {");
+  });
+});
+
 describe("NotebookPane client downloads", () => {
   test("keeps macOS, Windows, and Linux downloads visible in the desktop runtime", () => {
     expect(source).toContain('t("pwa.sidebarMac") || "macOS"');

apps/web/src/components/NotebookPane.tsx

@@ -55,7 +55,9 @@ import {
   getNotebookSortOptions,
   getNotebookSortComparator,
   hasEdgeEverDragData,
+  readNotebookTreeCollapsedIdsPreference,
   readNotebookSortPreference,
+  writeNotebookTreeCollapsedIdsPreference,
   writeNotebookSortPreference,
 } from "@/lib/app-helpers";
 import type { EdgeEverRepository } from "@/lib/repository";
@@ -529,6 +531,7 @@ export const NotebookPane = ({
   const notebookDragScrollFrameRef = useRef<number | null>(null);
   const [expandSiblingsRequest, setExpandSiblingsRequest] = useState<{ parentId: string | null; token: number } | null>(null);
   const [notebookSortMode, setNotebookSortMode] = useState<NotebookSortMode>(readNotebookSortPreference);
+  const [collapsedNotebookIds, setCollapsedNotebookIds] = useState<Set<string>>(readNotebookTreeCollapsedIdsPreference);
 
   const handleMoveNotebook = useCallback((notebookId: string, targetNotebookId: string, position: NotebookDropPosition) => {
     setNotebookSortMode("custom");
@@ -605,6 +608,26 @@ export const NotebookPane = ({
     writeNotebookSortPreference(notebookSortMode);
   }, [notebookSortMode]);
 
+  useEffect(() => {
+    writeNotebookTreeCollapsedIdsPreference(collapsedNotebookIds);
+  }, [collapsedNotebookIds]);
+
+  const handleNotebookOpenChange = useCallback((notebookId: string, open: boolean) => {
+    setCollapsedNotebookIds((current) => {
+      if (current.has(notebookId) === !open) {
+        return current;
+      }
+
+      const next = new Set(current);
+      if (open) {
+        next.delete(notebookId);
+      } else {
+        next.add(notebookId);
+      }
+      return next;
+    });
+  }, []);
+
   useEffect(() => {
     if (!selectedNotebookId) {
       return;
@@ -803,6 +826,8 @@ export const NotebookPane = ({
                 onMoveNotebook={handleMoveNotebook}
                 onMoveMemos={onMoveMemos}
                 onDragScroll={handleNotebookScrollDragOver}
+                collapsedNotebookIds={collapsedNotebookIds}
+                onOpenChange={handleNotebookOpenChange}
                 expandSiblingsRequest={expandSiblingsRequest}
                 onExpandSiblings={handleExpandNotebookSiblings}
               />

apps/web/src/components/NotebookTreeItem.tsx

@@ -37,6 +37,8 @@ export const NotebookTreeItem = ({
   onMoveNotebook,
   onMoveMemos,
   onDragScroll,
+  collapsedNotebookIds,
+  onOpenChange,
   expandSiblingsRequest,
   onExpandSiblings,
 }: {
@@ -50,11 +52,13 @@ export const NotebookTreeItem = ({
   onMoveNotebook: (notebookId: string, targetNotebookId: string, position: NotebookDropPosition) => void;
   onMoveMemos: (memoIds: string[], targetNotebookId: string) => void;
   onDragScroll: (event: DragEvent<HTMLDivElement>) => void;
+  collapsedNotebookIds: ReadonlySet<string>;
+  onOpenChange: (notebookId: string, open: boolean) => void;
   expandSiblingsRequest: { parentId: string | null; token: number } | null;
   onExpandSiblings: (parentId: string | null) => void;
 }) => {
   const { t } = useTranslation();
-  const [open, setOpen] = useState(true);
+  const open = !collapsedNotebookIds.has(node.id);
   const hasChildren = node.children.length > 0;
   const selected = node.id === selectedNotebookId;
   const isInbox = node.slug === "inbox";
@@ -90,19 +94,13 @@ export const NotebookTreeItem = ({
     return () => document.removeEventListener("pointerdown", closeOnOutsidePointer);
   }, [actionsOpen]);
 
-  useEffect(() => {
-    if (hasSelectedDescendant) {
-      setOpen(true);
-    }
-  }, [hasSelectedDescendant]);
-
   useEffect(() => {
     if (!expandSiblingsRequest || expandSiblingsRequest.parentId !== node.parentId || !hasChildren) {
       return;
     }
 
-    setOpen(true);
-  }, [expandSiblingsRequest, hasChildren, node.parentId]);
+    onOpenChange(node.id, true);
+  }, [expandSiblingsRequest, hasChildren, node.id, node.parentId, onOpenChange]);
 
   const scheduleDragExpand = (position: NotebookDropPosition) => {
     if (!hasChildren || open || position !== "inside") {
@@ -116,7 +114,7 @@ export const NotebookTreeItem = ({
 
     expandTimerRef.current = window.setTimeout(() => {
       expandTimerRef.current = null;
-      setOpen(true);
+      onOpenChange(node.id, true);
     }, NOTEBOOK_DRAG_EXPAND_DELAY_MS);
   };
 
@@ -155,7 +153,7 @@ export const NotebookTreeItem = ({
 
     if (memoIds.length > 0) {
       onMoveMemos(memoIds, node.id);
-      setOpen(true);
+      onOpenChange(node.id, true);
       return;
     }
 
@@ -164,7 +162,7 @@ export const NotebookTreeItem = ({
     }
 
     onMoveNotebook(notebookId, node.id, position);
-    setOpen(true);
+    onOpenChange(node.id, true);
   };
 
   return (
@@ -203,7 +201,7 @@ export const NotebookTreeItem = ({
               <button
                 className="flex h-6 w-5 items-center justify-center rounded hover:bg-slate-100/50 transition-colors"
                 type="button"
-                onClick={() => setOpen((value) => !value)}
+                onClick={() => onOpenChange(node.id, !open)}
                 title={t("notebookTree.expandCollapse")}
                 aria-label={open ? t("notebookTree.collapse", { name: node.name }) : t("notebookTree.expand", { name: node.name })}
                 aria-expanded={open}
@@ -250,14 +248,14 @@ export const NotebookTreeItem = ({
                 if (event.key === "ArrowRight" && hasChildren && !open) {
                   event.preventDefault();
                   event.stopPropagation();
-                  setOpen(true);
+                  onOpenChange(node.id, true);
                   return;
                 }
 
                 if (event.key === "ArrowLeft" && hasChildren && open) {
                   event.preventDefault();
                   event.stopPropagation();
-                  setOpen(false);
+                  onOpenChange(node.id, false);
                   return;
                 }
               }}
@@ -397,6 +395,8 @@ export const NotebookTreeItem = ({
               onMoveNotebook={onMoveNotebook}
               onMoveMemos={onMoveMemos}
               onDragScroll={onDragScroll}
+              collapsedNotebookIds={collapsedNotebookIds}
+              onOpenChange={onOpenChange}
               expandSiblingsRequest={expandSiblingsRequest}
               onExpandSiblings={onExpandSiblings}
             />

apps/web/src/lib/app-helpers.test.mjs

@@ -10,12 +10,14 @@ import {
   EDITOR_PHONE_PREVIEW_STORAGE_KEY,
   EDITOR_PHONE_PREVIEW_FOLLOW_STORAGE_KEY,
   NOTEBOOK_SORT_STORAGE_KEY,
+  NOTEBOOK_TREE_COLLAPSED_IDS_STORAGE_KEY,
   SHORTCUT_SETTINGS_STORAGE_KEY,
   getSearchShortcutScope,
   getShortcutActionForEvent,
   getNotebookSortComparator,
   readEditorContentAlignmentPreference,
   readNotebookSortPreference,
+  readNotebookTreeCollapsedIdsPreference,
   readDesktopFocusModePreference,
   readDesktopReadingProtectionPreference,
   readNotebookSidebarCollapsedPreference,
@@ -26,6 +28,7 @@ import {
   readShortcutSettingsPreference,
   writeEditorContentAlignmentPreference,
   writeNotebookSortPreference,
+  writeNotebookTreeCollapsedIdsPreference,
   writeDesktopFocusModePreference,
   writeDesktopReadingProtectionPreference,
   writeNotebookSidebarCollapsedPreference,
@@ -355,6 +358,43 @@ describe("custom notebook sorting", () => {
   });
 });
 
+describe("notebook tree collapsed preference", () => {
+  test("round-trips the user's collapsed notebook branches", () => {
+    const values = installLocalStorage();
+
+    writeNotebookTreeCollapsedIdsPreference(["notebook-2", "notebook-1", "notebook-2"]);
+
+    expect(values.get(NOTEBOOK_TREE_COLLAPSED_IDS_STORAGE_KEY)).toBe('["notebook-2","notebook-1"]');
+    expect(readNotebookTreeCollapsedIdsPreference()).toEqual(new Set(["notebook-2", "notebook-1"]));
+  });
+
+  test("ignores malformed and invalid stored values", () => {
+    const values = installLocalStorage();
+
+    values.set(NOTEBOOK_TREE_COLLAPSED_IDS_STORAGE_KEY, "{");
+    expect(readNotebookTreeCollapsedIdsPreference()).toEqual(new Set());
+
+    values.set(NOTEBOOK_TREE_COLLAPSED_IDS_STORAGE_KEY, JSON.stringify(["notebook-1", "", null, 2]));
+    expect(readNotebookTreeCollapsedIdsPreference()).toEqual(new Set(["notebook-1"]));
+  });
+
+  test("falls back to expanded when local storage is unavailable", () => {
+    globalThis.window = {
+      localStorage: {
+        getItem: () => {
+          throw new Error("blocked");
+        },
+        setItem: () => {
+          throw new Error("blocked");
+        },
+      },
+    };
+
+    expect(readNotebookTreeCollapsedIdsPreference()).toEqual(new Set());
+    expect(() => writeNotebookTreeCollapsedIdsPreference(["notebook-1"])).not.toThrow();
+  });
+});
+
 describe("workspace shortcut preferences", () => {
   test("provides navigation, AI, save, reading protection, and editor mode defaults", () => {
     expect(DEFAULT_SHORTCUT_SETTINGS.focusGlobalSearch).toEqual({

apps/web/src/lib/app-helpers.ts

@@ -140,6 +140,7 @@ export const EDITOR_PHONE_PREVIEW_FOLLOW_STORAGE_KEY = "edgeever.editor.phonePre
 export const MEMO_LIST_DENSITY_STORAGE_KEY = "edgeever.memoListDensity";
 export const MEMO_LIST_WIDTH_STORAGE_KEY = "edgeever.memoListWidth";
 export const NOTEBOOK_SORT_STORAGE_KEY = "edgeever.notebookSort";
+export const NOTEBOOK_TREE_COLLAPSED_IDS_STORAGE_KEY = "edgeever.notebookTreeCollapsedIds:v1";
 export const SHORTCUT_SETTINGS_STORAGE_KEY = "edgeever.shortcutSettings";
 export const DEFAULT_MEMO_LIST_WIDTH_PX = 360;
 export const MIN_MEMO_LIST_WIDTH_PX = 300;
@@ -516,6 +517,28 @@ export const writeNotebookSortPreference = (sortMode: NotebookSortMode) => {
   }
 };
 
+export const readNotebookTreeCollapsedIdsPreference = () => {
+  try {
+    const value: unknown = JSON.parse(window.localStorage.getItem(NOTEBOOK_TREE_COLLAPSED_IDS_STORAGE_KEY) ?? "[]");
+
+    if (!Array.isArray(value)) {
+      return new Set<string>();
+    }
+
+    return new Set(value.filter((notebookId): notebookId is string => typeof notebookId === "string" && notebookId.length > 0));
+  } catch {
+    return new Set<string>();
+  }
+};
+
+export const writeNotebookTreeCollapsedIdsPreference = (notebookIds: Iterable<string>) => {
+  try {
+    window.localStorage.setItem(NOTEBOOK_TREE_COLLAPSED_IDS_STORAGE_KEY, JSON.stringify(Array.from(new Set(notebookIds))));
+  } catch {
+    // Local storage can be unavailable in private or restricted browser contexts.
+  }
+};
+
 export const normalizeShortcutKey = (key: string) => {
   if (key === " ") {
     return "space";