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/i18n/locales/en/analytics.json

@@ -79,12 +79,7 @@
   "rangeFrom": "From",
   "rangeTo": "To",
   "query": {
-    "title": "Query Explorer",
-    "subtitle": "Filter sessions, events and agents, then export what you see.",
-    "entity": "Data",
     "entities": {
-      "sessions": "Sessions",
-      "events": "Events",
       "agents": "Agents"
     },
     "search": "Search",

client/src/i18n/locales/en/nav.json

@@ -1,6 +1,7 @@
 {
   "activityFeed": "Activity Feed",
   "agentBoard": "Kanban Board",
+  "agents": "Agents",
   "analytics": "Analytics",
   "avg": "avg",
   "brand": "AgentHub",
@@ -88,7 +89,6 @@
     }
   },
   "version": "Version",
-  "query": "Query Explorer",
   "openMenu": "Open menu",
   "resizeSidebar": "Resize sidebar (double-click to reset)",
   "closeMenu": "Close menu",

client/src/i18n/locales/vi/analytics.json

@@ -79,12 +79,7 @@
   "rangeFrom": "Từ ngày",
   "rangeTo": "Đến ngày",
   "query": {
-    "title": "Truy vấn dữ liệu",
-    "subtitle": "Lọc phiên, sự kiện và agent, rồi xuất đúng những gì đang thấy.",
-    "entity": "Dữ liệu",
     "entities": {
-      "sessions": "Phiên",
-      "events": "Sự kiện",
       "agents": "Agent"
     },
     "search": "Tìm kiếm",

client/src/i18n/locales/vi/nav.json

@@ -1,6 +1,7 @@
 {
   "activityFeed": "Luồng hoạt động",
   "agentBoard": "Bảng Kanban",
+  "agents": "Agent",
   "analytics": "Phân tích",
   "avg": "TB",
   "brand": "AgentHub",
@@ -88,7 +89,6 @@
     }
   },
   "version": "Phiên bản",
-  "query": "Truy vấn",
   "openMenu": "Mở menu",
   "resizeSidebar": "Kéo để đổi độ rộng sidebar (nhấp đúp để đặt lại)",
   "closeMenu": "Đóng menu",