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/Layout.tsx

@@ -12,6 +12,11 @@
  * written back on every toggle. Failures to access storage are swallowed so a
  * private-browsing quota error never breaks the UI.
  *
+ * ## Sidebar width
+ * The expanded sidebar's right edge drags (or takes ←/→) between
+ * {@link SIDEBAR_MIN} and {@link SIDEBAR_MAX} px — never past 40% of the
+ * window — kept in `agenthub.sidebar.width`; a double-click resets it.
+ *
  * ## Narrow viewports
  * With no stored preference the sidebar starts collapsed below `lg` (see
  * {@link loadCollapsed}). Below `md` it leaves the flow entirely: a menu
@@ -79,6 +84,26 @@ import { UpdateNotifier } from "./UpdateNotifier";
 import { Sagi } from "./Sagi/Sagi";
 import { StatusBar } from "./StatusBar";
 
+const WIDTH_KEY = "agenthub.sidebar.width";
+/** The default width, and the narrowest the edge drags to. */
+export const SIDEBAR_MIN = 240;
+/** Wide enough for long workspace names on a large screen, no wider. */
+export const SIDEBAR_MAX = 480;
+
+/** A width inside the bounds, and at most 40% of the window. */
+export function clampSidebar(px: number): number {
+  const max = Math.max(SIDEBAR_MIN, Math.min(SIDEBAR_MAX, window.innerWidth * 0.4));
+  return Math.round(Math.min(max, Math.max(SIDEBAR_MIN, px)));
+}
+
+function loadWidth(): number {
+  try {
+    const n = Number(localStorage.getItem(WIDTH_KEY));
+    if (n) return clampSidebar(n);
+  } catch {}
+  return SIDEBAR_MIN;
+}
+
 /** Below Tailwind's `md`: the sidebar becomes an off-canvas drawer. */
 export const DRAWER_QUERY = "(max-width: 767.98px)";
 
@@ -112,7 +137,17 @@ export function Layout({ wsConnected }: LayoutProps) {
   const [drawerOpen, setDrawerOpen] = useState(false);
   const closeDrawer = useCallback(() => setDrawerOpen(false), []);
   const { pathname, search } = useLocation();
-  const sidebarWidth = drawer ? "0rem" : collapsed ? "4.25rem" : "15rem";
+  const [width, setWidth] = useState(loadWidth);
+  const [resizing, setResizing] = useState(false);
+  const sidebarWidth = drawer ? "0rem" : collapsed ? "4.25rem" : `${width}px`;
+
+  const saveWidth = useCallback((px: number) => {
+    const next = clampSidebar(px);
+    setWidth(next);
+    try {
+      localStorage.setItem(WIDTH_KEY, String(next));
+    } catch {}
+  }, []);
 
   // A pick in the drawer navigates; the drawer has done its job.
   useEffect(closeDrawer, [pathname, search, closeDrawer]);
@@ -153,11 +188,52 @@ export function Layout({ wsConnected }: LayoutProps) {
         connectionOpen={connectionOpen}
         onConnectionOpenChange={setConnectionOpen}
         onUpdateAvailableChange={setUpdateAvailable}
+        width={width}
+        resizing={resizing}
       />
+      {!drawer && !collapsed && (
+        <div
+          role="separator"
+          tabIndex={0}
+          aria-orientation="vertical"
+          aria-valuenow={width}
+          aria-valuemin={SIDEBAR_MIN}
+          aria-valuemax={SIDEBAR_MAX}
+          aria-label={t("resizeSidebar")}
+          title={t("resizeSidebar")}
+          data-testid="sidebar-resize"
+          className={`fixed top-0 bottom-0 z-30 w-1.5 -translate-x-1/2 cursor-col-resize outline-none transition-colors hover:bg-accent/40 focus-visible:bg-accent/60 ${
+            resizing ? "bg-accent/60" : ""
+          }`}
+          style={{ left: width }}
+          onPointerDown={(e) => {
+            e.preventDefault();
+            e.currentTarget.setPointerCapture?.(e.pointerId);
+            setResizing(true);
+          }}
+          onPointerMove={(e) => {
+            if (resizing) setWidth(clampSidebar(e.clientX));
+          }}
+          onPointerUp={(e) => {
+            if (!resizing) return;
+            setResizing(false);
+            saveWidth(e.clientX);
+          }}
+          onPointerCancel={() => setResizing(false)}
+          onDoubleClick={() => saveWidth(SIDEBAR_MIN)}
+          onKeyDown={(e) => {
+            if (e.key !== "ArrowLeft" && e.key !== "ArrowRight") return;
+            e.preventDefault();
+            saveWidth(width + (e.key === "ArrowRight" ? 16 : -16));
+          }}
+        />
+      )}
       <main
         id="main-content"
         tabIndex={-1}
-        className="min-h-screen min-w-0 pb-6 transition-[margin-left,width] duration-200 outline-none"
+        className={`min-h-screen min-w-0 pb-6 duration-200 outline-none ${
+          resizing ? "" : "transition-[margin-left,width]"
+        }`}
         style={{
           marginLeft: sidebarWidth,
           width: `calc(100% - ${sidebarWidth})`,