Aggiunge heatmaps first-party (click/scroll) con pagina admin Analytics.

Raccoglie eventi aggregati dietro consenso cookie, senza PII né tracking su admin/regia/live/replay; GA4 resta invariato.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/views/layouts/admin.html.erb

@@ -5,7 +5,7 @@
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <meta name="robots" content="noindex, nofollow">
   <%= csrf_meta_tags %>
-  <link rel="stylesheet" href="/admin.css?v=12">
+  <link rel="stylesheet" href="/admin.css?v=13">
   <% if content_for?(:replay_archive_styles) %>
     <link rel="stylesheet" href="/marketing.css?v=42">
   <% end %>
@@ -31,6 +31,7 @@
         <%= link_to t("admin.layout.nav.billing"), admin_billing_path, class: ("active" if controller_name.in?(%w[billing billing_invoices])) %>
         <%= link_to t("admin.layout.nav.youtube"), admin_youtube_platform_path, class: ("active" if controller_name == "youtube") %>
         <%= link_to t("admin.layout.nav.sessions"), admin_sessions_path, class: ("active" if controller_name == "sessions") %>
+        <%= link_to t("admin.layout.nav.analytics"), admin_analytics_path, class: ("active" if controller_name == "analytics") %>
         <%= link_to t("admin.layout.nav.stream_nodes"), admin_stream_nodes_path, class: ("active" if controller_name == "stream_nodes") %>
         <%= link_to t("admin.layout.nav.password"), edit_admin_password_path %>
         <%= button_to t("admin.layout.nav.logout"), admin_logout_path, method: :delete %>