fix(web): add next/navigation mock to AppShell test after client component conversion

web/src/components/AppShell.test.tsx

@@ -2,6 +2,10 @@ import { render, screen } from "@testing-library/react";
 import { describe, expect, it, vi } from "vitest";
 import { AppShell } from "./AppShell";
 
+vi.mock("next/navigation", () => ({
+  usePathname: () => "/dashboard",
+}));
+
 vi.mock("@/components/Sidebar", () => ({
   Sidebar: () => <div data-testid="sidebar">Sidebar</div>,
 }));