feat: v2.5.4 — Query Explorer folded into Sessions, Windows picker and paths

- Sessions page tabs: Sessions · Events · Agents. QueryExplorer.tsx became
  AgentsTable.tsx (agents only — sessions and events already had tabs);
  /query redirects to /sessions?view=agents and leaves the sidebar.
  GET /api/query is unchanged and still answers all three entities.
- Windows picker opens in front: -EncodedCommand script spends the hidden
  first ShowWindow that windowsHide gives the process, then brings the TopMost
  owner forward via AttachThreadInput (v2.5.3's owner was itself hidden).
- Session page Resume/Fork/Open pane: owningLane and sessionWorktreeName
  match Windows folders (either separator), with a test.

client/src/pages/History.tsx

@@ -1,17 +1,19 @@
 /**
  * @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.
+ * @description Tabbed shell for /sessions that hosts the three views over the
+ * same data: the per-session list, the raw activity feed and the agents table.
+ * The active tab lives in the `?view=` query param, so `/activity` and the old
+ * `/query` Query Explorer 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 { Activity, Bot, FolderOpen } from "lucide-react";
 import { PageTabs } from "../components/PageTabs";
 import { Sessions } from "./Sessions";
 import { ActivityFeed } from "./ActivityFeed";
+import { AgentsTable } from "./AgentsTable";
 
 interface HistoryView {
   id: string;
@@ -21,7 +23,7 @@ interface HistoryView {
 }
 
 /**
- * Sessions page shell: grouped sessions and the raw event stream as sibling tabs.
+ * Sessions page shell: sessions, the raw event stream and agents as sibling tabs.
  * @returns The tab bar plus the active view.
  */
 export function History() {
@@ -31,6 +33,7 @@ export function History() {
   const views: HistoryView[] = [
     { id: "sessions", label: t("sessions"), Icon: FolderOpen, Panel: Sessions },
     { id: "events", label: t("activityFeed"), Icon: Activity, Panel: ActivityFeed },
+    { id: "agents", label: t("agents"), Icon: Bot, Panel: AgentsTable },
   ];
   const defaultView = views[0]!;
   const active = views.find((v) => v.id === params.get("view")) ?? defaultView;