The navbar takes its service and name from the Contracts site block (#4)

ddiff --git a/server/http/pages.js b/server/http/pages.js
iindex e7f6b48..c9ba9f3 100644
---- a/server/http/pages.js
++++ b/server/http/pages.js
@@@ -16,11 +16,27 @@ const express = require('express');
  const shell = require('openvibe-shared/shell');
  const ovServe = require('openvibe-shared/serve');
  const cache = require('openvibe-shared/cache-policy');
++const contracts = require('openvibe-contracts');
  
  const PUBLIC_DIR = path.join(__dirname, '..', '..', 'public');
--const SITE_NAME = 'OpenVibe.Email';
  const NETWORK_URL = 'https://openvibe.network';
  
++/**
++ * The navbar's service id and display name from the site block in OpenVibe.Contracts (the `mail` manifest), with the
++ * names the page shipped with before that manifest existed. The site block says "Email", so the page reads
++ * "OpenVibe.Email"; the service id is what Shared's navbar, history and theme use.
++ */
++function siteIdentity(manifest) {
++    const short = manifest && manifest.site && manifest.site.name;
++    return {
++        service: (manifest && manifest.id) || 'mail',
++        name: short ? (/^Open[A-Z]/.test(short) ? short : `OpenVibe.${short}`) : 'OpenVibe.Email',
++    };
++}
++const SITE = siteIdentity(contracts.services && contracts.services.get && contracts.services.get('mail'));
++const SITE_NAME = SITE.name;
++const SERVICE = SITE.service;
++
  const hashes = new Map();
  function assetVersion(rel) {
      if (hashes.has(rel)) return hashes.get(rel);
@@@ -51,7 +67,7 @@ const BODY = fs.readFileSync(path.join(__dirname, '..', 'views', 'home.html'), '
  function homePage(config) {
      const base = String(config.baseUrl || 'https://openvibe.email').replace(/\/+$/, '');
      const nav = {
--        service: 'mail',
++        service: SERVICE,
          apiBase: NETWORK_URL,
          links: [{ label: 'Home', href: '/', active: true }],
          history: { type: 'page', title: SITE_NAME },
@@@ -60,7 +76,7 @@ function homePage(config) {
          loginUrl: '/auth/login?next={path}',
          logoutUrl: '/auth/logout?next={path}',
      };
--    const footer = { service: 'mail', variant: 'full', mount: '#ov-footer', brandName: SITE_NAME };
++    const footer = { service: SERVICE, variant: 'full', mount: '#ov-footer', brandName: SITE_NAME };
      return shell.page({
          name: SITE_NAME,
          lang: 'en',
@@@ -110,4 +126,4 @@ function mountPages(app, { config }) {
      });
  }
  
--module.exports = { mountPages, homePage, CSP, asset };
++module.exports = { mountPages, homePage, siteIdentity, CSP, asset };
ddiff --git a/test/page.test.js b/test/page.test.js
iindex 9167c88..bc5edf6 100644
---- a/test/page.test.js
++++ b/test/page.test.js
@@@ -7,7 +7,13 @@
  const test = require('node:test');
  const assert = require('node:assert');
  const { boot } = require('./helpers/boot');
--const { asset } = require('../server/http/pages');
++const { asset, siteIdentity } = require('../server/http/pages');
++
++test('the navbar takes its service and name from the Contracts site block', () => {
++    assert.deepStrictEqual(siteIdentity({ id: 'mail', site: { name: 'Email' } }), { service: 'mail', name: 'OpenVibe.Email' });
++    assert.deepStrictEqual(siteIdentity({ id: 'mail', site: { name: 'OpenVibe.Post' } }), { service: 'mail', name: 'OpenVibe.Post' }, 'a brand name is not doubled');
++    assert.deepStrictEqual(siteIdentity(null), { service: 'mail', name: 'OpenVibe.Email' }, 'before the manifest is pinned, the page keeps the names it shipped with');
++});
  
  test('/ is the page: the ten-minute address, the honest cards, the navbar, a strict policy', async (t) => {
      const s = await boot();