feat: analytics parity — tool cost, date ranges, budgets, query explorer, replay, snapshots (v2.4.0)

Analytics parity phases 2–7 (docs/plans/analytics-parity/), built on
138e706 and ported onto v2.3.1:
- Cost by AI tool (?tool= on cost/analytics/stats/workflows, by_tool,
  Codex fast/priority and flex tiers, agenthub_cost_usd_total{tool,model})
- Date ranges (from/to) on cost/analytics/workflows; Analytics range select
  with Today / This week (Monday) / This month (1st) / 7d / 30d / 90d / All /
  Custom; workflow filters carried into workflow-stats.js (read worker)
- Budgets and cost alerts as alert rule types (alert_rules rebuilt without
  its rule_type CHECK), GET /api/budgets/status, rule preview, spend pace,
  status-bar budget chip; rules stay editable in place
- Query Explorer (/query, allowlisted sort, CSV/JSON export) and scheduled
  reports (report_definitions/report_runs, Settings → Reports)
- Session Replay tab and immutable snapshots (session_snapshots, /snapshot/:token)
- Remote Codex sync, push ingest with a hashed token, privacy redaction and
  ignored folders (Settings → Data), Cursor sessions (no cost)
- Read-only MCP server, statusline, Grafana/Prometheus files

Also: resizable sidebar, pet run/wave animations, the workspace home keeps a
half-typed prompt, and the pre-commit hook runs only the related tests for a
small commit.

client/src/components/__tests__/AlertsNotifications.spend.test.tsx

@@ -0,0 +1,102 @@
+/**
+ * @file Tests for the alert rule form's spend rules: a budget rule is built
+ * from period / limit / thresholds / AI tool (plus the browser's timezone
+ * offset), Preview shows what it would have fired without saving it, and
+ * Create saves the same config.
+ * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
+ */
+
+import { describe, it, expect, vi } from "vitest";
+import { render, screen } from "@testing-library/react";
+import { MemoryRouter } from "react-router-dom";
+import userEvent from "@testing-library/user-event";
+
+vi.mock("../../lib/api", () => ({
+  api: {
+    alerts: {
+      list: vi.fn().mockResolvedValue({ alerts: [], total: 0, unacked: 0, limit: 50, offset: 0 }),
+      rules: {
+        list: vi.fn().mockResolvedValue({ rules: [] }),
+        create: vi.fn().mockResolvedValue({ rule: {} }),
+        preview: vi.fn().mockResolvedValue({
+          supported: true,
+          window_days: 7,
+          fires: 1,
+          sessions: 0,
+          samples: [],
+          periods: [
+            {
+              period_start: "2026-09-01",
+              period_end: "2026-09-30",
+              spend: 120,
+              pct: 120,
+              crossed: [80, 100],
+            },
+            {
+              period_start: "2026-10-01",
+              period_end: "2026-10-31",
+              spend: 10,
+              pct: 10,
+              crossed: [],
+            },
+          ],
+        }),
+      },
+    },
+    aiTools: {
+      list: vi.fn().mockResolvedValue({
+        tools: [{ id: "codex", label: "Codex" }],
+        default: "claude",
+      }),
+    },
+  },
+}));
+
+import { api } from "../../lib/api";
+import { AlertsNotifications } from "../AlertsNotifications";
+
+describe("AlertsNotifications — spend rules", () => {
+  it("previews and creates a budget rule", async () => {
+    const user = userEvent.setup();
+    render(
+      <MemoryRouter>
+        <AlertsNotifications />
+      </MemoryRouter>
+    );
+    await user.click(await screen.findByText("Add rule"));
+    await user.type(screen.getByPlaceholderText("e.g. Error burst"), "Monthly");
+    const selects = screen.getAllByRole("combobox");
+    await user.selectOptions(selects[0]!, "budget");
+    await user.selectOptions(screen.getByDisplayValue("month"), "week");
+    const limit = screen.getByDisplayValue("100");
+    await user.clear(limit);
+    await user.type(limit, "50");
+    await screen.findByRole("option", { name: "Codex" });
+    await user.selectOptions(screen.getByDisplayValue("All AI tools"), "codex");
+
+    await user.click(screen.getByRole("button", { name: /Preview/ }));
+    const config = {
+      period: "week",
+      limit_usd: 50,
+      thresholds: [80, 100],
+      tz_offset: new Date().getTimezoneOffset(),
+      tool: "codex",
+    };
+    expect(api.alerts.rules.preview).toHaveBeenCalledWith({
+      rule_type: "budget",
+      config,
+      cooldown_seconds: 300,
+    });
+    expect(await screen.findByText("2026-09-01")).toBeInTheDocument();
+    expect(screen.getByText("80% 100%")).toBeInTheDocument();
+    expect(api.alerts.rules.create).not.toHaveBeenCalled();
+
+    await user.click(screen.getByRole("button", { name: /Create rule/ }));
+    expect(api.alerts.rules.create).toHaveBeenCalledWith({
+      name: "Monthly",
+      rule_type: "budget",
+      config,
+      cooldown_seconds: 300,
+    });
+  });
+});

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

@@ -0,0 +1,93 @@
+/**
+ * @file EventReplay.test.tsx
+ * @description The Replay tab's controls: step, jump, arrow keys, a lifecycle
+ * marker jumping the cursor, playback advancing on a timer, and the derived
+ * state following the cursor.
+ * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
+ */
+
+import { describe, it, expect, vi, afterEach } from "vitest";
+import { act, fireEvent, render, screen } from "@testing-library/react";
+import { MemoryRouter } from "react-router-dom";
+import { EventReplay } from "../EventReplay";
+import type { DashboardEvent } from "../../lib/types";
+
+function ev(id: number, event_type: string, tool_name: string | null = null): DashboardEvent {
+  return {
+    id,
+    session_id: "s1",
+    agent_id: "a1",
+    event_type,
+    tool_name,
+    summary: `${event_type} ${tool_name ?? ""}`.trim(),
+    data: null,
+    created_at: new Date(Date.UTC(2026, 9, 1, 10, 0, id)).toISOString(),
+  } as DashboardEvent;
+}
+
+// Given newest first, as the events API answers: the replay orders them itself.
+const events = [
+  ev(4, "Stop"),
+  ev(3, "PostToolUse", "Bash"),
+  ev(2, "PreToolUse", "Bash"),
+  ev(1, "SessionStart"),
+];
+
+function renderReplay() {
+  return render(
+    <MemoryRouter>
+      <EventReplay events={events} agentInfoById={new Map()} sessionNameById={new Map()} />
+    </MemoryRouter>
+  );
+}
+
+const position = () => screen.getByText(/^\d+ \/ 4/);
+
+afterEach(() => vi.useRealTimers());
+
+describe("EventReplay", () => {
+  it("starts at the first event and steps with the buttons", () => {
+    renderReplay();
+    expect(position().textContent).toMatch(/^1 \/ 4/);
+    fireEvent.click(screen.getByTitle("Step forward (→)"));
+    fireEvent.click(screen.getByTitle("Step forward (→)"));
+    expect(position().textContent).toMatch(/^3 \/ 4/);
+    expect(screen.getByText("Bash ×1")).toBeTruthy();
+    fireEvent.click(screen.getByTitle("Jump to end (End)"));
+    expect(position().textContent).toMatch(/^4 \/ 4/);
+    fireEvent.click(screen.getByTitle("Jump to start (Home)"));
+    expect(position().textContent).toMatch(/^1 \/ 4/);
+  });
+
+  it("moves on arrow keys and jumps from a lifecycle marker", () => {
+    renderReplay();
+    const root = screen.getByTestId("event-replay");
+    fireEvent.keyDown(root, { key: "ArrowRight" });
+    expect(position().textContent).toMatch(/^2 \/ 4/);
+    // The in-flight tool at the PreToolUse.
+    expect(screen.getByText("Running tool").nextSibling?.textContent).toBe("Bash");
+    fireEvent.keyDown(root, { key: "End" });
+    expect(position().textContent).toMatch(/^4 \/ 4/);
+    fireEvent.click(screen.getByRole("button", { name: "Session start · #1" }));
+    expect(position().textContent).toMatch(/^1 \/ 4/);
+  });
+
+  it("plays to the end at the chosen speed", () => {
+    vi.useFakeTimers();
+    renderReplay();
+    fireEvent.click(screen.getByRole("button", { name: "5×" }));
+    fireEvent.click(screen.getByTitle("Play (Space)"));
+    act(() => {
+      vi.advanceTimersByTime(100);
+    });
+    expect(position().textContent).toMatch(/^2 \/ 4/);
+    // One step per tick: each step schedules the next.
+    for (let i = 0; i < 3; i++) {
+      act(() => {
+        vi.advanceTimersByTime(100);
+      });
+    }
+    expect(position().textContent).toMatch(/^4 \/ 4/);
+    expect(screen.getByTitle("Play (Space)")).toBeTruthy();
+  });
+});

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

@@ -3,7 +3,8 @@
  * @description Responsive shell: with no stored preference the sidebar starts
  * collapsed below `lg`, and below `md` it becomes an off-canvas drawer opened
  * from a menu button — a modal dialog that Escape and the backdrop close,
- * handing focus back to the button.
+ * handing focus back to the button. The expanded sidebar's edge resizes it
+ * within its bounds and remembers the width.
  * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
  */
 
@@ -16,7 +17,7 @@ vi.mock("../UpdateNotifier", () => ({ UpdateNotifier: () => null }));
 vi.mock("../StatusBar", () => ({ StatusBar: () => null }));
 vi.mock("../WorkspaceTree", () => ({ WorkspaceTree: () => null }));
 
-import { Layout, DRAWER_QUERY } from "../Layout";
+import { Layout, DRAWER_QUERY, SIDEBAR_MIN, SIDEBAR_MAX } from "../Layout";
 import { loadCollapsed, SIDEBAR_STORAGE_KEY } from "../Sidebar";
 
 function viewport(width: number) {
@@ -34,6 +35,7 @@ function viewport(width: number) {
 afterEach(() => {
   vi.unstubAllGlobals();
   localStorage.removeItem(SIDEBAR_STORAGE_KEY);
+  localStorage.removeItem("agenthub.sidebar.width");
 });
 
 describe("loadCollapsed", () => {
@@ -95,3 +97,47 @@ describe("Layout drawer", () => {
     expect(screen.getByRole("main").style.marginLeft).toBe("4.25rem");
   });
 });
+
+describe("Layout sidebar width", () => {
+  it("the edge drags within bounds, is remembered, and a double-click resets it", () => {
+    viewport(1440);
+    vi.stubGlobal("innerWidth", 2560);
+    render(
+      <MemoryRouter>
+        <Layout wsConnected />
+      </MemoryRouter>
+    );
+    const edge = screen.getByTestId("sidebar-resize");
+    const main = screen.getByRole("main");
+    expect(main.style.marginLeft).toBe(`${SIDEBAR_MIN}px`);
+
+    fireEvent.pointerDown(edge, { pointerId: 1 });
+    fireEvent.pointerMove(edge, { clientX: 360 });
+    fireEvent.pointerUp(edge, { clientX: 360 });
+    expect(main.style.marginLeft).toBe("360px");
+    expect(screen.getByTestId("sidebar").style.width).toBe("360px");
+    expect(localStorage.getItem("agenthub.sidebar.width")).toBe("360");
+
+    fireEvent.pointerDown(edge, { pointerId: 1 });
+    fireEvent.pointerUp(edge, { clientX: 2000 });
+    expect(main.style.marginLeft).toBe(`${SIDEBAR_MAX}px`);
+
+    fireEvent.keyDown(edge, { key: "ArrowLeft" });
+    expect(main.style.marginLeft).toBe(`${SIDEBAR_MAX - 16}px`);
+
+    fireEvent.doubleClick(edge);
+    expect(main.style.marginLeft).toBe(`${SIDEBAR_MIN}px`);
+  });
+
+  it("never wider than 40% of the window", () => {
+    viewport(1100);
+    vi.stubGlobal("innerWidth", 1100);
+    localStorage.setItem("agenthub.sidebar.width", "480");
+    render(
+      <MemoryRouter>
+        <Layout wsConnected />
+      </MemoryRouter>
+    );
+    expect(screen.getByRole("main").style.marginLeft).toBe("440px");
+  });
+});

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

@@ -111,6 +111,21 @@ vi.mock("../../lib/api", () => ({
         daily_costs: [],
       })),
     },
+    budgets: {
+      status: vi.fn().mockResolvedValue({
+        budgets: [
+          { id: "b1", name: "Quiet", config: { limit_usd: 100 }, spend: 10, pct: 10, crossed: [] },
+          {
+            id: "b2",
+            name: "Monthly",
+            config: { limit_usd: 100 },
+            spend: 85,
+            pct: 85,
+            crossed: [80],
+          },
+        ],
+      }),
+    },
   },
 }));
 
@@ -142,6 +157,14 @@ describe("StatusBar", () => {
     expect(screen.getByRole("status")).toHaveTextContent("Live · 1 need you");
   });
 
+  it("flags the budget furthest past a threshold, linking to the cost analytics", async () => {
+    at("/", <StatusBar wsConnected left="0" onConnectionClick={() => {}} />);
+    const chip = await screen.findByTestId("status-bar-budget");
+    expect(chip.textContent).toBe("Budget 85%");
+    expect(chip.getAttribute("href")).toBe("/?tab=analytics&sub=cost");
+    expect(chip.getAttribute("title")).toBe("Monthly: $85.00 of $100.00 this period");
+  });
+
   it("says Disconnected when the socket is down", () => {
     at("/", <StatusBar wsConnected={false} left="0" onConnectionClick={() => {}} />);
     expect(screen.getByRole("button", { name: /Disconnected/ })).toBeInTheDocument();