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/README.md

@@ -205,7 +205,8 @@ client/
 │   │
 │   ├── pages/              # Route pages
 │   │   ├── Dashboard.tsx      # Monitor / Analytics / Health tabs; Analytics' date range (Today/This week from Monday/This month from the 1st/7d/30d/90d/All/Custom, `?range=`, lib/dateRange.ts) narrows its headline, cost and token cards
-│   │   ├── QueryExplorer.tsx  # /query: filter sessions / events / agents, sort, page, export CSV/JSON (GET /api/query)
+│   │   ├── History.tsx        # /sessions tab shell (?view=): Sessions · Events (ActivityFeed) · Agents (AgentsTable)
+│   │   ├── AgentsTable.tsx    # /sessions?view=agents (the old /query redirects here): filter agents, sort, page, export CSV/JSON (GET /api/query?entity=agents)
 │   │   ├── Sessions.tsx       # Filterable table; shows each session's real name (synced live from the transcript), falls back to the short ID
 │   │   ├── SessionDetail.tsx  # Agent tree + event timeline + Conversation tab (slash-command pills & output, inline rename markers) + Replay tab (EventReplay) + Snapshot action
 │   │   ├── SnapshotView.tsx   # Read-only /snapshot/:token page over a frozen session payload
@@ -504,7 +505,8 @@ function App() {
           <Route index element={<Dashboard />} />
           <Route path="sessions" element={<History />} />
           <Route path="sessions/:id" element={<SessionDetail />} />
-          <Route path="query" element={<QueryExplorer />} />
+          {/* legacy path - the Query Explorer is now the Agents tab on /sessions */}
+          <Route path="query" element={<Navigate to="/sessions?view=agents" replace />} />
           {/* legacy path - the activity feed is now a tab on /sessions */}
           <Route path="activity" element={<Navigate to="/sessions?view=events" replace />} />
           <Route path="workflows" element={<Navigate to="/?tab=analytics&sub=workflow" replace />} />