fix(web): show thread undo notice in the sidebar

apps/web/src/components/ChatView.tsx

@@ -230,7 +230,6 @@ import {
 import { BranchToolbar, type BranchToolbarHandle } from "./BranchToolbar";
 import { resolveShortcutCommand, shortcutLabelForCommand } from "../keybindings";
 import { isEditableFocused } from "../lib/editableFocus";
-import { undoLatestThreadAction } from "../hooks/showUndoToast";
 import ThreadTerminalDrawer from "./ThreadTerminalDrawer";
 import {
   AlarmClockIcon,
@@ -6731,17 +6730,6 @@ export default function ChatView(props: ChatViewProps) {
         return;
       }
 
-      if (command === "thread.undo") {
-        // Only claim the chord when there is an Undo to run; otherwise the
-        // page keeps its native behavior for the key.
-        if (event.repeat) return;
-        if (undoLatestThreadAction()) {
-          event.preventDefault();
-          event.stopPropagation();
-        }
-        return;
-      }
-
       if (command === "thread.pin") {
         event.preventDefault();
         event.stopPropagation();

apps/web/src/components/Sidebar.tsx

@@ -3077,9 +3077,7 @@ export default function Sidebar() {
         settlingThreadKeysRef.current.add(threadKey);
         try {
           const navigateAfterSettle = planForwardNavigation(threadKey, opts.coSettlingKeys);
-          const result = await settleThread(threadRef, {
-            undoToast: opts.coSettlingKeys === undefined,
-          });
+          const result = await settleThread(threadRef);
           if (result._tag === "Failure") {
             // Never navigate away from a thread that did not settle.
             if (!isAtomCommandInterrupted(result)) {
@@ -3731,9 +3729,7 @@ export default function Sidebar() {
         // Snoozing the open thread moves you forward, same as settle —
         // both park the thread you're done with for now.
         const navigateAfterSnooze = planForwardNavigation(threadKey, opts.coSnoozingKeys);
-        const result = await snoozeThread(threadRef, preset.snoozedUntil, {
-          undoToast: opts.coSnoozingKeys === undefined,
-        });
+        const result = await snoozeThread(threadRef, preset.snoozedUntil);
         if (result._tag === "Failure") {
           // Never navigate away from a thread that did not snooze.
           return isAtomCommandInterrupted(result)
@@ -3887,35 +3883,15 @@ export default function Sidebar() {
             outcome.status === "failure" ? [outcome.error] : [],
           );
 
-          if (snoozedThreadRefs.length > 0) {
-            const snoozedCount = snoozedThreadRefs.length;
-            const failedCount = failures.length;
-            toastManager.add(
-              stackedThreadToast({
-                type: failedCount > 0 ? "warning" : "success",
-                title:
-                  failedCount > 0
-                    ? `Snoozed ${snoozedCount} of ${selectedThreads.length} threads`
-                    : `Snoozed ${snoozedCount} thread${snoozedCount === 1 ? "" : "s"}`,
-                description:
-                  failedCount > 0
-                    ? `${failedCount} thread${failedCount === 1 ? "" : "s"} couldn't be snoozed.`
-                    : undefined,
-                timeout: 5_000,
-                actionProps: {
-                  children: "Undo",
-                  onClick: () => {
-                    for (const threadRef of snoozedThreadRefs) attemptUnsnooze(threadRef);
-                  },
-                },
-              }),
-            );
-          } else if (failures.length > 0) {
+          if (failures.length > 0) {
             const firstError = failures[0];
             toastManager.add(
               stackedThreadToast({
                 type: "error",
-                title: "Failed to snooze threads",
+                title:
+                  snoozedThreadRefs.length > 0
+                    ? `Failed to snooze ${failures.length} thread${failures.length === 1 ? "" : "s"}`
+                    : "Failed to snooze threads",
                 description:
                   firstError instanceof Error ? firstError.message : "An error occurred.",
               }),
@@ -4019,7 +3995,6 @@ export default function Sidebar() {
     },
     [
       attemptSettle,
-      attemptSnooze,
       attemptUnpin,
       clearSelection,
       confirmThreadDelete,
@@ -4028,7 +4003,6 @@ export default function Sidebar() {
       performSnooze,
       removeFromSelection,
       serverConfigs,
-      attemptUnsnooze,
       updateThreadMetadata,
       timestampFormat,
     ],

apps/web/src/components/sidebar/SidebarChrome.tsx

@@ -26,6 +26,7 @@ import {
 } from "../ui/sidebar";
 import { Tooltip, TooltipPopup, TooltipTrigger } from "../ui/tooltip";
 import { readPullRequestListPreferences } from "../pullRequest/pullRequestListPreferences";
+import { SidebarThreadUndoNotice } from "./SidebarThreadUndoNotice";
 import { SidebarProviderUpdatePill } from "./SidebarProviderUpdatePill";
 import { SidebarUpdateArchitectureWarning, SidebarUpdatePill } from "./SidebarUpdatePill";
 import { PullRequestGlyph } from "~/components/pullRequest/pullRequestIcons";
@@ -221,6 +222,7 @@ export const SidebarUtilityMenu = memo(function SidebarUtilityMenu() {
 export const SidebarChromeFooter = memo(function SidebarChromeFooter() {
   return (
     <SidebarFooter className="px-[var(--sidebar-content-inset)] py-1">
+      <SidebarThreadUndoNotice />
       <SidebarProviderUpdatePill />
       <SidebarUpdateArchitectureWarning />
       <SidebarUtilityMenu />

apps/web/src/components/sidebar/SidebarThreadUndoNotice.tsx

@@ -0,0 +1,30 @@
+import { useAtomValue } from "@effect/atom-react";
+
+import { undoLatestThreadAction, useThreadUndoNotice } from "../../hooks/showThreadUndoNotice";
+import { shortcutLabelForCommand } from "../../keybindings";
+import { primaryServerKeybindingsAtom } from "../../state/server";
+import { Alert, AlertDescription } from "../ui/alert";
+import { InlineButton } from "../ui/button";
+
+export function SidebarThreadUndoNotice() {
+  const notice = useThreadUndoNotice((state) => state.notice);
+  const keybindings = useAtomValue(primaryServerKeybindingsAtom);
+
+  if (!notice) return null;
+  const shortcut = shortcutLabelForCommand(keybindings, "thread.undo");
+
+  return (
+    <Alert role="status" variant="sidebar">
+      <AlertDescription>
+        {notice.action} {notice.count} thread{notice.count === 1 ? "" : "s"},{" "}
+        <InlineButton
+          underline
+          onClick={undoLatestThreadAction}
+          className="hover:text-sidebar-foreground"
+        >
+          {shortcut ? `${shortcut} to undo` : "Undo"}
+        </InlineButton>
+      </AlertDescription>
+    </Alert>
+  );
+}

apps/web/src/components/ui/alert.tsx

@@ -11,6 +11,8 @@ const alertVariants = cva("relative rounded-xl border px-3.5 py-3 text-card-fore
   variants: {
     variant: {
       default: "bg-transparent dark:bg-input/32 [&_svg]:text-muted-foreground",
+      sidebar:
+        "rounded-lg border-sidebar-border bg-sidebar-control-surface px-2 py-1.5 text-[11px] leading-4 [&_[data-slot=alert-description]]:block [&_[data-slot=alert-description]]:text-sidebar-muted-foreground",
       error:
         "border-error/32 bg-error-surface text-error-foreground [&_[data-slot=alert-description]]:text-error-foreground/80 [&_svg]:text-error",
       info: "border-info/32 bg-info/4 [&_svg]:text-info",

apps/web/src/hooks/showThreadUndoNotice.test.ts

@@ -0,0 +1,152 @@
+import { AsyncResult } from "effect/unstable/reactivity";
+import * as Cause from "effect/Cause";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vite-plus/test";
+
+import { toastManager } from "../components/ui/toast";
+import {
+  showThreadUndoNotice,
+  undoLatestThreadAction,
+  useThreadUndoNotice,
+} from "./showThreadUndoNotice";
+import * as ThreadUndo from "./threadUndo";
+
+beforeEach(() => vi.useFakeTimers());
+afterEach(() => {
+  vi.runAllTimers();
+  vi.useRealTimers();
+  vi.restoreAllMocks();
+});
+
+function setup() {
+  const add = vi.spyOn(toastManager, "add").mockReturnValue("error-toast");
+  const undo = vi.fn(async () => AsyncResult.success(undefined));
+  const claim = ThreadUndo.begin("pin", "env/thread");
+  const options = { action: "Unpinned" as const, failureTitle: "Restore failed", undo, claim };
+  return { add, undo, claim, options };
+}
+
+function notice() {
+  const value = useThreadUndoNotice.getState().notice;
+  if (!value) throw new Error("Undo notice is missing");
+  return value;
+}
+
+describe("thread undo notice", () => {
+  it("aggregates consecutive actions without success toasts and restores the group once", async () => {
+    const { add, undo, options } = setup();
+    showThreadUndoNotice({
+      ...options,
+      action: "Settled",
+      claim: ThreadUndo.begin("settle", "env/a"),
+    });
+    showThreadUndoNotice({
+      ...options,
+      action: "Settled",
+      claim: ThreadUndo.begin("settle", "env/b"),
+    });
+    expect(notice()).toMatchObject({ action: "Settled", count: 2 });
+    expect(add).not.toHaveBeenCalled();
+    const group = notice();
+    await group.undo();
+    await group.undo();
+    expect(undo).toHaveBeenCalledTimes(2);
+    expect(undoLatestThreadAction()).toBe(false);
+  });
+
+  it("drops invalidated claims immediately and rejects a captured stale undo", async () => {
+    const { undo, options } = setup();
+    showThreadUndoNotice(options);
+    const stale = notice();
+    ThreadUndo.invalidate("pin", "env/thread");
+    expect(useThreadUndoNotice.getState().notice).toBeNull();
+    showThreadUndoNotice({ ...options, claim: ThreadUndo.begin("pin", "env/thread") });
+    await stale.undo();
+    expect(undo).not.toHaveBeenCalled();
+    await notice().undo();
+    expect(undo).toHaveBeenCalledOnce();
+  });
+
+  it("does not show a notice for a late completion after a newer action", () => {
+    const { add, options } = setup();
+    ThreadUndo.invalidate("pin", "env/thread");
+    showThreadUndoNotice(options);
+    expect(useThreadUndoNotice.getState().notice).toBeNull();
+    expect(add).not.toHaveBeenCalled();
+  });
+
+  it("keeps the group available until five seconds after the latest action", async () => {
+    const { undo, claim, options } = setup();
+    showThreadUndoNotice(options);
+    vi.advanceTimersByTime(4_000);
+    const second = ThreadUndo.begin("pin", "env/second");
+    showThreadUndoNotice({ ...options, claim: second });
+    const group = notice();
+    vi.advanceTimersByTime(4_999);
+    expect(notice().count).toBe(2);
+    vi.advanceTimersByTime(1);
+    expect(useThreadUndoNotice.getState().notice).toBeNull();
+    expect(claim.isCurrent()).toBe(false);
+    expect(second.isCurrent()).toBe(false);
+    await group.undo();
+    expect(undo).not.toHaveBeenCalled();
+  });
+
+  it("reports a failed restore and releases its claim", async () => {
+    const { add, claim, options } = setup();
+    showThreadUndoNotice({
+      ...options,
+      undo: async () => AsyncResult.failure(Cause.fail(new Error("offline"))),
+    });
+    await notice().undo();
+    expect(add).toHaveBeenLastCalledWith(
+      expect.objectContaining({ type: "error", title: "Restore failed", description: "offline" }),
+    );
+    expect(claim.isCurrent()).toBe(false);
+  });
+
+  it("reports a rejected restore promise", async () => {
+    const { add, options } = setup();
+    showThreadUndoNotice({
+      ...options,
+      undo: async () => {
+        throw new Error("disconnected");
+      },
+    });
+    await notice().undo();
+    expect(add).toHaveBeenLastCalledWith(
+      expect.objectContaining({ type: "error", description: "disconnected" }),
+    );
+  });
+
+  it("does not report interrupted restores as errors", async () => {
+    const { add, options } = setup();
+    showThreadUndoNotice({ ...options, undo: async () => AsyncResult.failure(Cause.interrupt()) });
+    await notice().undo();
+    expect(add).not.toHaveBeenCalled();
+  });
+
+  it("undoes the latest kind first, then reveals the preceding group", async () => {
+    const { options } = setup();
+    const older = vi.fn(async () => AsyncResult.success(undefined));
+    const newer = vi.fn(async () => AsyncResult.success(undefined));
+    showThreadUndoNotice({
+      ...options,
+      action: "Settled",
+      undo: older,
+      claim: ThreadUndo.begin("settle", "env/a"),
+    });
+    showThreadUndoNotice({
+      ...options,
+      action: "Snoozed",
+      undo: newer,
+      claim: ThreadUndo.begin("snooze", "env/b"),
+    });
+    expect(undoLatestThreadAction()).toBe(true);
+    expect(newer).toHaveBeenCalledOnce();
+    expect(older).not.toHaveBeenCalled();
+    expect(notice().action).toBe("Settled");
+    await notice().undo();
+    expect(older).toHaveBeenCalledOnce();
+    expect(undoLatestThreadAction()).toBe(false);
+  });
+});