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/StatusBar.tsx

@@ -23,10 +23,10 @@
 import { Fragment, useCallback, useEffect, useRef, useState } from "react";
 import { createPortal } from "react-dom";
 import { useTranslation } from "react-i18next";
-import { useLocation } from "react-router-dom";
+import { Link, useLocation } from "react-router-dom";
 import { RefreshCw, RotateCcw, Wifi, WifiOff } from "lucide-react";
 import { api, type RunHandle } from "../lib/api";
-import type { CostResult, ToolQuota } from "../lib/types";
+import type { BudgetStatus, CostResult, ToolQuota } from "../lib/types";
 import { fmt, fmtCostFull, formatModelName, timeAgo } from "../lib/format";
 import { AiToolIcon } from "./AiToolIcon";
 import { useLiveRefresh } from "../hooks/useLiveRefresh";
@@ -342,6 +342,8 @@ export function StatusBar({
   const [laneCost, setLaneCost] = useState<CostResult | null>(null);
   const [sessionCost, setSessionCost] = useState<CostResult | null>(null);
   const [runs, setRuns] = useState<RunHandle[]>([]);
+  // The budget furthest past one of its thresholds, if any.
+  const [budget, setBudget] = useState<BudgetStatus | null>(null);
   const location = useLocation();
   const shown = selectedFrom(location.pathname, location.search);
   const lane = shown.lane;
@@ -381,6 +383,13 @@ export function StatusBar({
         .totalCost({ date: localDate() })
         .then((r) => live && setToday(r))
         .catch(() => undefined);
+      api.budgets
+        .status()
+        .then(({ budgets }) => {
+          const hit = budgets.filter((b) => b.crossed.length > 0).sort((a, b) => b.pct - a.pct);
+          if (live) setBudget(hit[0] ?? null);
+        })
+        .catch(() => undefined);
       if (lane !== null) {
         api.pricing
           .totalCost({ lane })
@@ -470,6 +479,20 @@ export function StatusBar({
           r={sessionCost}
         />
       )}
+      {budget && (
+        <Link
+          to="/?tab=analytics&sub=cost"
+          data-testid="status-bar-budget"
+          title={t("statusBar.budgetTitle", {
+            name: budget.name,
+            spend: usd(budget.spend),
+            limit: usd(budget.config.limit_usd ?? 0),
+          })}
+          className={`tabular-nums hover:underline ${budget.pct >= 100 ? "text-status-danger" : "text-status-warning"}`}
+        >
+          {t("statusBar.budget", { pct: Math.round(budget.pct) })}
+        </Link>
+      )}
       <QuotaChips />
     </footer>
   );