Standardize page width, card layouts; mark SSO users external and read-only

- All pages now wrap their content in <div class="container mt-4">,
  matching sso-manager-node's width instead of rendering full-bleed inside
  the fluid shell.
- Users and Permissions pages converted from bare <table>s to the same
  card-grid convention already used on the Groups page.
- Users backed by SSO/OIDC login (backing === 'oidc', set by the redis
  user model's JIT-provisioning path) are now marked "External (SSO)" and
  their password-change control is hidden; PUT /password/:username also
  rejects with 403 server-side for such users. Deletion stays allowed.
  Redis-backend only -- LDAP/PAM deployments have no per-record marker for
  this today.
- app-base.js (byte-identical across the 3 apps): added
  app.util.revealItem(), wired into the Users/Permissions create flows.
- Bumped @simpleworkjs/frontend to ^0.2.7.

nodejs/views/hosts.ejs

@@ -752,6 +752,7 @@
 	});
 </script>
 
+<div class="container mt-4">
 <div class="row" style="display:none">
 	<div class="col-12">
 		<div class="card shadow-lg hostListPanel">
@@ -886,5 +887,6 @@
 		</div>
 	</div>
 </div>
+</div>
 
 <%- include('bottom') %>