feat(web): TanStack Query hooks + session-guarded routes

Installs @tanstack/react-query and react-router-dom; adds typed query
hooks (useMe, useObjectsPage, useObject, useFieldDefinitions, useLogin,
useLogout), a QueryClient+MemoryRouter test render helper, and
RequireAuth — a layout route that blocks unauthenticated access and
redirects to /login. All 7 tests pass, typecheck/lint/build clean.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/package.json

@@ -16,6 +16,7 @@
   "dependencies": {
     "@base-ui/react": "^1.5.0",
     "@fontsource-variable/geist": "^5.2.9",
+    "@tanstack/react-query": "^5.101.0",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
     "i18next": "^26.3.0",
@@ -24,6 +25,7 @@
     "react": "^19.1.0",
     "react-dom": "^19.1.0",
     "react-i18next": "^17.0.8",
+    "react-router-dom": "^7.16.0",
     "tailwind-merge": "^3.6.0",
     "tw-animate-css": "^1.4.0"
   },