Unify the front-end UI shell across the theta42 apps

views/top.ejs, views/bottom.ejs and public/lib/js/app-base.js are now
byte-identical across sso-manager-node, proxy and jump-host. Everything
per-app moved into utils/ui.js, exposed to every render as `ui` via
app.locals (nav items + their group gates, footer repo/docs/ToS links,
favicon, profile/logout targets, update-banner on/off + label).

Client framework changes:
- One gating model everywhere: app-base.js reveals .group-required-<cn>
  for each of the current user user/me groups. sso-manager-node sends LDAP
  DNs in memberOf, the OIDC clients send CNs in groups; both normalise to
  CNs, and the clients isAdmin flag becomes a synthetic `admin` group, so
  proxy nav-admin items are now group-required-admin.
- user/me is fetched once per page load and cached (app.auth.loadUser);
  nav, forceLogin and group-required elements all read that one promise.
- isLoggedIn is dual-mode (Promise + node-style callback), so the async
  and callback call styles both work from one shared top.ejs.
- forceLogin no longer uses $.holdReady (removed in jQuery 4): it redirects
  to /login?redirect=<path>, and still enforces required groups.
- logOut only clears the session; the caller decides where to go next.
- post/put/delete are dual-mode Promise/callback, which also removes the
  undefined `callback2` reference that threw on a non-function callback.

Dependencies: jquery ^4.0.0 and ejs ^3.1.10 in all three apps.

jump-host specifics:
- .group-required base rule added to styles.css (no gated nav items yet).
- #spa-shell drops its inline margin-top; styles.css already sets it, and
  the shared shell adjusts it when a banner is shown.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

nodejs/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "t42-jump-host",
-  "version": "1.1.0",
+  "version": "1.2.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "t42-jump-host",
-      "version": "1.1.0",
+      "version": "1.2.0",
       "license": "MIT",
       "dependencies": {
         "@fortawesome/fontawesome-free": "^7.3.0",
@@ -22,7 +22,7 @@
         "express": "^5.2.1",
         "express-rate-limit": "^8.5.2",
         "jq-repeat": "^2.2.0",
-        "jquery": "^3.7.1",
+        "jquery": "^4.0.0",
         "ldapts": "^8.1.8",
         "model-redis": "^1.6.0",
         "moment": "^2.30.1",
@@ -1186,9 +1186,9 @@
       }
     },
     "node_modules/jquery": {
-      "version": "3.7.1",
-      "resolved": "https://registry.npmjs.org/jquery/-/jquery-3.7.1.tgz",
-      "integrity": "sha512-m4avr8yL8kmFN8psrbFFFmB/If14iN5o9nw/NgnnM+kybDJpRsAynV2BsfpTYrTRysYUdADVD7CkUUizgkpLfg==",
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/jquery/-/jquery-4.0.0.tgz",
+      "integrity": "sha512-TXCHVR3Lb6TZdtw1l3RTLf8RBWVGexdxL6AC8/e0xZKEpBflBsjh9/8LXw+dkNFuOyW9B7iB3O1sP7hS0Kiacg==",
       "license": "MIT"
     },
     "node_modules/ldapts": {