feat(sessions): merge the activity feed into a tab on /sessions

Sessions and Activity Feed are two views of the same event pipeline, so
they now share one page: /sessions renders a tab bar (Sessions | Activity
Feed) with the active view in the ?view= query param, and /activity
redirects to /sessions?view=events. The sidebar entry is dropped.

The tab bar itself moves out of SettingsHub into components/PageTabs so
both hubs share it, and DocumentTitle loses the two branches for paths
that now only redirect.

client/README.md

@@ -444,9 +444,9 @@ useEffect(() => {
 graph TB
     Root["/"]
     Dashboard["/ (Dashboard)"]
-    Sessions["/sessions"]
+    Sessions["/sessions (tabs: sessions | events)"]
     Detail["/sessions/:id"]
-    Feed["/activity"]
+    Feed["/activity (redirect)"]
     Workflows["/workflows"]
     CcConfig["/cc-config (redirect)"]
     Run["/run"]
@@ -472,9 +472,10 @@ function App() {
       <Routes>
         <Route path="/" element={<Layout />}>
           <Route index element={<Dashboard />} />
-          <Route path="sessions" element={<Sessions />} />
+          <Route path="sessions" element={<History />} />
           <Route path="sessions/:id" element={<SessionDetail />} />
-          <Route path="activity" element={<ActivityFeed />} />
+          {/* legacy path - the activity feed is now a tab on /sessions */}
+          <Route path="activity" element={<Navigate to="/sessions?view=events" replace />} />
           <Route path="workflows" element={<Workflows />} />
           {/* legacy path - Claude config now lives in a Settings tab */}
           <Route path="cc-config" element={<Navigate to="/settings?tool=claude-code" replace />} />

client/src/App.tsx

@@ -39,9 +39,8 @@
  * - `./components/Layout`
  * - `./components/SplashScreen`
  * - `./pages/Dashboard`
- * - `./pages/Sessions`
+ * - `./pages/History`
  * - `./pages/SessionDetail`
- * - `./pages/ActivityFeed`
  * - `./pages/Workflows`
  * - `./pages/SettingsHub`
  * - `./pages/Workspace`
@@ -63,9 +62,8 @@ import { Layout } from "./components/Layout";
 import { DocumentTitle } from "./components/DocumentTitle";
 import { SplashScreen } from "./components/SplashScreen";
 import { Dashboard } from "./pages/Dashboard";
-import { Sessions } from "./pages/Sessions";
+import { History } from "./pages/History";
 import { SessionDetail } from "./pages/SessionDetail";
-import { ActivityFeed } from "./pages/ActivityFeed";
 import { Workflows } from "./pages/Workflows";
 import { SettingsHub } from "./pages/SettingsHub";
 import { Workspace } from "./pages/Workspace";
@@ -95,9 +93,9 @@ export default function App() {
         <Routes>
           <Route element={<Layout wsConnected={connected} />}>
             <Route index element={<Dashboard />} />
-            <Route path="sessions" element={<Sessions />} />
+            <Route path="sessions" element={<History />} />
             <Route path="sessions/:id" element={<SessionDetail />} />
-            <Route path="activity" element={<ActivityFeed />} />
+            <Route path="activity" element={<Navigate to="/sessions?view=events" replace />} />
             <Route path="workflows" element={<Workflows />} />
             <Route path="lanes" element={<Navigate to="/run" replace />} />
             <Route

client/src/components/DocumentTitle.tsx

@@ -24,12 +24,8 @@ export function DocumentTitle() {
     title = `${t("sessions")} · ${sessionId.slice(0, 8)}`;
   } else if (path.startsWith("/sessions")) {
     title = t("sessions");
-  } else if (path.startsWith("/activity")) {
-    title = t("activityFeed");
   } else if (path.startsWith("/workflows")) {
     title = t("workflows");
-  } else if (path.startsWith("/cc-config")) {
-    title = t("ccConfig");
   } else if (path.startsWith("/run")) {
     title = t("run");
   } else if (path.startsWith("/settings")) {

client/src/components/PageTabs.tsx

@@ -0,0 +1,60 @@
+/**
+ * @file PageTabs.tsx
+ * @description Shared top-of-page tab bar used by the pages that merged several
+ * former routes into one (Settings hub, Sessions/Events history). Rendering only -
+ * the owning page keeps the active tab in its own query param.
+ * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
+ */
+import type { ComponentType } from "react";
+
+export interface PageTab {
+  id: string;
+  label: string;
+  Icon: ComponentType<{ className?: string }>;
+  /** Small muted suffix, e.g. "soon" for a tool that is not integrated yet. */
+  badge?: string;
+}
+
+interface PageTabsProps {
+  tabs: PageTab[];
+  activeId: string;
+  onSelect: (id: string) => void;
+  ariaLabel: string;
+}
+
+/**
+ * Horizontal tab strip for a page that hosts several panels.
+ * @param props - Tabs to render, the active tab id, and the selection callback.
+ * @returns The tab bar element.
+ */
+export function PageTabs({ tabs, activeId, onSelect, ariaLabel }: PageTabsProps) {
+  return (
+    <div
+      role="tablist"
+      aria-label={ariaLabel}
+      className="flex items-center gap-1.5 overflow-x-auto no-scrollbar border-b border-border/60 pb-2"
+    >
+      {tabs.map(({ id, label, Icon, badge }) => {
+        const isActive = id === activeId;
+        return (
+          <button
+            key={id}
+            type="button"
+            role="tab"
+            aria-selected={isActive}
+            onClick={() => onSelect(id)}
+            className={`inline-flex items-center gap-1.5 text-xs whitespace-nowrap px-3 py-1.5 rounded-lg border transition-colors flex-shrink-0 ${
+              isActive
+                ? "bg-accent/15 border-accent/30 text-accent"
+                : "border-border text-fg-secondary hover:text-fg-primary hover:bg-surface-3"
+            }`}
+          >
+            <Icon className="w-3.5 h-3.5" />
+            {label}
+            {badge && <span className="text-[10px] text-fg-muted">{badge}</span>}
+          </button>
+        );
+      })}
+    </div>
+  );
+}

client/src/components/Sidebar.tsx

@@ -88,7 +88,6 @@ function isUpdatePayload(x: unknown): x is UpdateStatusPayload {
 const NAV_KEYS = [
   { to: "/", icon: LayoutDashboard, key: "nav:dashboard" },
   { to: "/sessions", icon: FolderOpen, key: "nav:sessions" },
-  { to: "/activity", icon: Activity, key: "nav:activityFeed" },
   { to: "/workflows", icon: Workflow, key: "nav:workflows" },
   { to: "/run", icon: Play, key: "nav:workspace" },
   { to: "/settings", icon: Settings, key: "nav:settings" },

client/src/components/__tests__/Sidebar.test.tsx

@@ -33,7 +33,10 @@ describe("Sidebar", () => {
     renderSidebar(true);
     expect(screen.getByText("Dashboard")).toBeInTheDocument();
     expect(screen.getByText("Sessions")).toBeInTheDocument();
-    expect(screen.getByText("Activity Feed")).toBeInTheDocument();
+    // Activity Feed and Claude Config are no longer top-level entries: they
+    // moved into tabs on /sessions and /settings respectively.
+    expect(screen.getByText("Settings")).toBeInTheDocument();
+    expect(screen.queryByText("Activity Feed")).toBeNull();
   });
 
   it('should show "Live" when WebSocket is connected', () => {
@@ -60,7 +63,8 @@ describe("Sidebar", () => {
     const hrefs = links.map((link) => link.getAttribute("href"));
     expect(hrefs).toContain("/");
     expect(hrefs).toContain("/sessions");
-    expect(hrefs).toContain("/activity");
+    expect(hrefs).toContain("/settings");
+    expect(hrefs).not.toContain("/activity");
   });
 
   it("should render both language options in expanded mode", () => {

client/src/pages/History.tsx

@@ -0,0 +1,49 @@
+/**
+ * @file History.tsx
+ * @description Tabbed shell for /sessions that hosts the two views over the same
+ * event pipeline: the per-session list and the raw activity feed. The active tab
+ * lives in the `?view=` query param, so `/activity` can redirect into it.
+ * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
+ */
+import type { ComponentType } from "react";
+import { useSearchParams } from "react-router-dom";
+import { useTranslation } from "react-i18next";
+import { Activity, FolderOpen } from "lucide-react";
+import { PageTabs } from "../components/PageTabs";
+import { Sessions } from "./Sessions";
+import { ActivityFeed } from "./ActivityFeed";
+
+interface HistoryView {
+  id: string;
+  label: string;
+  Icon: ComponentType<{ className?: string }>;
+  Panel: ComponentType;
+}
+
+/**
+ * Sessions page shell: grouped sessions and the raw event stream as sibling tabs.
+ * @returns The tab bar plus the active view.
+ */
+export function History() {
+  const { t } = useTranslation("nav");
+  const [params, setParams] = useSearchParams();
+
+  const views: HistoryView[] = [
+    { id: "sessions", label: t("sessions"), Icon: FolderOpen, Panel: Sessions },
+    { id: "events", label: t("activityFeed"), Icon: Activity, Panel: ActivityFeed },
+  ];
+  const defaultView = views[0]!;
+  const active = views.find((v) => v.id === params.get("view")) ?? defaultView;
+
+  return (
+    <div className="space-y-6">
+      <PageTabs
+        ariaLabel={t("sessions")}
+        activeId={active.id}
+        onSelect={(id) => setParams(id === defaultView.id ? {} : { view: id }, { replace: true })}
+        tabs={views.map(({ id, label, Icon }) => ({ id, label, Icon }))}
+      />
+      <active.Panel />
+    </div>
+  );
+}

client/src/pages/SettingsHub.tsx

@@ -7,6 +7,7 @@ import type { ComponentType } from "react";
 import { useSearchParams } from "react-router-dom";
 import { useTranslation } from "react-i18next";
 import { Boxes, Settings as SettingsIcon, SquareTerminal, MousePointerClick } from "lucide-react";
+import { PageTabs } from "../components/PageTabs";
 import { Settings } from "./Settings";
 import { CcConfig } from "./CcConfig";
 
@@ -45,37 +46,17 @@ export function SettingsHub() {
 
   return (
     <div className="space-y-6">
-      <div
-        role="tablist"
-        aria-label={t("tools.label", "Tools")}
-        className="flex items-center gap-1.5 overflow-x-auto no-scrollbar border-b border-border/60 pb-2"
-      >
-        {TOOL_TABS.map(({ id, labelKey, Icon, Panel }) => {
-          const isActive = id === active.id;
-          return (
-            <button
-              key={id}
-              type="button"
-              role="tab"
-              aria-selected={isActive}
-              onClick={() =>
-                setParams(id === DASHBOARD_TAB.id ? {} : { tool: id }, { replace: true })
-              }
-              className={`inline-flex items-center gap-1.5 text-xs whitespace-nowrap px-3 py-1.5 rounded-lg border transition-colors flex-shrink-0 ${
-                isActive
-                  ? "bg-accent/15 border-accent/30 text-accent"
-                  : "border-border text-fg-secondary hover:text-fg-primary hover:bg-surface-3"
-              }`}
-            >
-              <Icon className="w-3.5 h-3.5" />
-              {t(labelKey)}
-              {!Panel && (
-                <span className="text-[10px] text-fg-muted">{t("tools.soonBadge", "soon")}</span>
-              )}
-            </button>
-          );
-        })}
-      </div>
+      <PageTabs
+        ariaLabel={t("tools.label", "Tools")}
+        activeId={active.id}
+        onSelect={(id) => setParams(id === DASHBOARD_TAB.id ? {} : { tool: id }, { replace: true })}
+        tabs={TOOL_TABS.map(({ id, labelKey, Icon, Panel }) => ({
+          id,
+          Icon,
+          label: t(labelKey),
+          ...(Panel ? {} : { badge: t("tools.soonBadge", "soon") }),
+        }))}
+      />
 
       {active.Panel ? (
         <active.Panel />