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/pages/SettingsHub.tsx

@@ -33,6 +33,8 @@ import {
   Database,
   Info,
   Bot,
+  Camera,
+  CalendarClock,
   Coins,
   GitBranch,
   KeyRound,
@@ -47,6 +49,8 @@ import { AiToolConfig } from "./AiToolConfig";
 import { AiRouterConfig } from "./AiRouterConfig";
 import { GitCredentialsConfig } from "./GitCredentialsConfig";
 import { AppearanceSettings } from "../components/settings/AppearanceSettings";
+import { SnapshotSettings } from "../components/settings/SnapshotSettings";
+import { ReportSettings } from "../components/settings/ReportSettings";
 import { AiToolsSettings } from "../components/settings/AiToolsSettings";
 import { PricingSettings } from "../components/settings/PricingSettings";
 import { WorktreeVisibilitySettings } from "../components/settings/WorktreeVisibilitySettings";
@@ -223,6 +227,20 @@ export function SettingsHub() {
       ...s("appearance"),
       render: () => <AppearanceSettings />,
     },
+    {
+      id: "snapshots",
+      group: "general",
+      Icon: Camera,
+      ...s("snapshots"),
+      render: () => <SnapshotSettings />,
+    },
+    {
+      id: "reports",
+      group: "general",
+      Icon: CalendarClock,
+      ...s("reports"),
+      render: () => <ReportSettings />,
+    },
     {
       id: "notifications",
       group: "general",