feat: persist sidebar fold preference across logins

web/workspace/src/lib/workspace/console/worker-console.ui.test.ts

@@ -1329,7 +1329,7 @@ Deno.test("Account UI owns browser passkey session state without workspace autho
       sidebarFrame.includes("sidebar-fold-button") &&
       sidebarFrame.includes("Fold sidebar") &&
       sidebarFrame.includes("Unfold sidebar") &&
-      rootLayout.includes("let sidebarFolded = $state(false)") &&
+      rootLayout.includes("let sidebarFolded = $state(loadSidebarFolded())") &&
       rootLayout.includes("<SidebarFrame bind:folded={sidebarFolded}>") &&
       !workspaceLayout.includes("sidebarFolded") &&
       !workspaceLayout.includes("onToggleFold") &&

web/workspace/src/routes/+layout.svelte

@@ -24,7 +24,27 @@
   const headerOverrides = createOverrideStack<HeaderSnippet>((activeHeader) => {
     header = activeHeader;
   });
-  let sidebarFolded = $state(false);
+  // Browser-wide layout preference; independent of authentication and Workspace.
+  const sidebarFoldStorageKey = 'yoi.sidebar.folded.v1';
+  function loadSidebarFolded(): boolean {
+    if (typeof window === 'undefined') return false;
+    try {
+      return window.localStorage.getItem(sidebarFoldStorageKey) === 'true';
+    } catch {
+      return false;
+    }
+  }
+
+  let sidebarFolded = $state(loadSidebarFolded());
+
+  $effect(() => {
+    const folded = sidebarFolded;
+    try {
+      window.localStorage.setItem(sidebarFoldStorageKey, String(folded));
+    } catch {
+      // Storage can be blocked or full; folding must still work for this page.
+    }
+  });
 
   function toggleSidebar() {
     sidebarFolded = !sidebarFolded;

web/workspace/src/routes/sidebar-fold.browser.spec.ts

@@ -0,0 +1,82 @@
+// @vitest-environment happy-dom
+
+import { cleanup, fireEvent, render, screen } from "@testing-library/svelte";
+import { afterEach, beforeEach, expect, test, vi } from "vitest";
+import { createRawSnippet } from "svelte";
+import { logout } from "$lib/workspace/auth/api";
+import Layout from "./+layout.svelte";
+
+vi.mock("$app/state", () => ({ page: { url: new URL("https://example.test/") } }));
+
+const storageKey = "yoi.sidebar.folded.v1";
+const props = {
+  params: {},
+  children: createRawSnippet(() => ({ render: () => "<p>Page content</p>" })),
+  data: { accessibleWorkspaces: [], workspaceCatalogError: null },
+};
+
+beforeEach(() => localStorage.clear());
+afterEach(() => {
+  cleanup();
+  vi.restoreAllMocks();
+  vi.unstubAllGlobals();
+  localStorage.clear();
+});
+
+test("sidebar starts unfolded and persists both desktop and mobile toggles", async () => {
+  const view = render(Layout, { props });
+  expect(screen.getByRole("button", { name: "Fold sidebar" }).getAttribute("aria-expanded")).toBe("true");
+  await fireEvent.click(screen.getByRole("button", { name: "Fold sidebar" }));
+  expect(localStorage.getItem(storageKey)).toBe("true");
+  expect(view.container.querySelector(".app-shell")?.classList.contains("sidebar-open")).toBe(false);
+  await fireEvent.click(screen.getByRole("button", { name: "Show sidebar" }));
+  expect(localStorage.getItem(storageKey)).toBe("false");
+  expect(screen.getByRole("button", { name: "Fold sidebar" })).not.toBeNull();
+  await fireEvent.click(screen.getByRole("button", { name: "Hide sidebar" }));
+  expect(localStorage.getItem(storageKey)).toBe("true");
+  await fireEvent.click(screen.getByRole("button", { name: "Unfold sidebar" }));
+  expect(localStorage.getItem(storageKey)).toBe("false");
+});
+
+test.each([true, false])("restores stored folded=%s without overwriting it with the default", (folded) => {
+  localStorage.setItem(storageKey, String(folded));
+  const writes = vi.spyOn(Storage.prototype, "setItem");
+  const view = render(Layout, { props });
+  expect(screen.getByRole("button", { name: folded ? "Unfold sidebar" : "Fold sidebar" }).getAttribute("aria-expanded")).toBe(String(!folded));
+  expect(view.container.querySelector(".app-shell")?.classList.contains("sidebar-open")).toBe(!folded);
+  expect(writes.mock.calls.every(([key, value]) => key !== storageKey || value === String(folded))).toBe(true);
+});
+
+test("fold preference survives logout and a fresh app mount", async () => {
+  vi.stubGlobal("fetch", vi.fn(async () => Response.json({ status: "logged_out" })));
+  const view = render(Layout, { props });
+  await fireEvent.click(screen.getByRole("button", { name: "Fold sidebar" }));
+  await logout();
+  view.unmount();
+  render(Layout, { props });
+  expect(screen.getByRole("button", { name: "Unfold sidebar" })).not.toBeNull();
+  expect(localStorage.getItem(storageKey)).toBe("true");
+});
+
+test("invalid storage falls back to unfolded", () => {
+  localStorage.setItem(storageKey, "not-a-boolean");
+  render(Layout, { props });
+  expect(screen.getByRole("button", { name: "Fold sidebar" })).not.toBeNull();
+});
+
+test("unavailable storage does not prevent folding", async () => {
+  vi.spyOn(window, "localStorage", "get").mockImplementation(() => { throw new DOMException("Blocked", "SecurityError"); });
+  render(Layout, { props });
+  await fireEvent.click(screen.getByRole("button", { name: "Fold sidebar" }));
+  expect(screen.getByRole("button", { name: "Unfold sidebar" })).not.toBeNull();
+  await fireEvent.click(screen.getByRole("button", { name: "Show sidebar" }));
+  expect(screen.getByRole("button", { name: "Fold sidebar" })).not.toBeNull();
+});
+
+test("full storage still restores the saved value and allows toggles", async () => {
+  localStorage.setItem(storageKey, "true");
+  vi.spyOn(Storage.prototype, "setItem").mockImplementation(() => { throw new DOMException("Full", "QuotaExceededError"); });
+  render(Layout, { props });
+  await fireEvent.click(screen.getByRole("button", { name: "Unfold sidebar" }));
+  expect(screen.getByRole("button", { name: "Fold sidebar" })).not.toBeNull();
+});