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/components/lanes/__tests__/sessionPaths.test.ts

@@ -0,0 +1,33 @@
+/**
+ * @file Tests that a session finds its workspace and its `claude --worktree`
+ * name by folder on Windows paths (`D:\…`) as well as POSIX ones — the
+ * transcript page's Resume/Fork/Open pane hid on Windows when they matched
+ * on "/" only.
+ * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
+ */
+
+import { describe, it, expect } from "vitest";
+import type { Lane, Session } from "../../../lib/types";
+import { owningLane } from "../SessionResumeButton";
+import { sessionWorktreeName } from "../WorkspaceSessionList";
+
+const lane = (id: number, cwd: string) => ({ id, cwd, tool: "claude" }) as Lane;
+
+describe("session paths", () => {
+  it("finds the deepest owning workspace with either separator", () => {
+    const lanes = [lane(1, "D:\\Project"), lane(2, "D:\\Project\\Hobby\\"), lane(3, "/home/u/app")];
+    expect(owningLane("D:\\Project\\Hobby\\tri-vi-portfolio", "claude", lanes)?.id).toBe(2);
+    expect(owningLane("D:\\Project\\Hobby", "claude", lanes)?.id).toBe(2);
+    expect(owningLane("D:\\ProjectX", "claude", lanes)).toBeNull();
+    expect(owningLane("/home/u/app/src", "claude", lanes)?.id).toBe(3);
+  });
+
+  it("reads a worktree name from a Windows or POSIX session folder", () => {
+    const at = (cwd: string) => ({ cwd }) as Session;
+    expect(
+      sessionWorktreeName(lane(1, "D:\\repo"), at("D:\\repo\\.claude\\worktrees\\fix-a"))
+    ).toBe("fix-a");
+    expect(sessionWorktreeName(lane(1, "/r"), at("/r/.claude/worktrees/fix-b/"))).toBe("fix-b");
+    expect(sessionWorktreeName(lane(1, "D:\\repo"), at("D:\\repo\\"))).toBeNull();
+  });
+});