Fix sub-app permissions bug, add Comments app, support Site Editor

- Root-cause fix for "Sorry, you are not allowed to access this page" on
  Menu Creator/Activity Log/Role Editor: remove_submenu_page() was
  corrupting WP core's user_can_access_admin_page() capability lookup.
  Sub-apps now stay registered in $submenu; MenuSerializer filters them
  out of the sidebar instead.
- Add a 6th sub-app, Comments, with a redirect from native edit-comments.php.
- Extend the window-chrome/taskbar framing to the Site Editor
  (site-editor.php), including a fix for a CSS position:fixed
  over-constraint bug that let its frame run past the viewport.
- Rewrite the taskbar from a single sessionStorage slot to a list so
  multiple minimized windows are each independently restorable.
- Extend native-dark.css coverage to the block editor's own chrome.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

admin/src/App/AuroraAdmin.php

@@ -9,6 +9,7 @@ use AuroraAdmin\Rest\DashboardData;
 use AuroraAdmin\Analytics\Analytics;
 use AuroraAdmin\Rest\AnalyticsData;
 use AuroraAdmin\Rest\PluginsData;
+use AuroraAdmin\Rest\CommentsData;
 use AuroraAdmin\Posts\ScheduledDayFilter;
 use AuroraAdmin\WhiteLabel\WhiteLabel;
 use AuroraAdmin\Pages\SubApps;
@@ -41,6 +42,7 @@ class AuroraAdmin
     new Analytics();
     new AnalyticsData();
     new PluginsData();
+    new CommentsData();
     new ScheduledDayFilter();
     new WhiteLabel();
     new SubApps();