complete editor panel reorganisation polish

- fix Site tab not loading theme state on direct URL navigation
- fix nav editor showing "Custom URL" for page links (detect by URL match)
- add Home option to nav page picker
- mark editor-reorganisation plan as complete
- add dynamic-url-customisation and draft-publish-workflow plans

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

lib/berrypod_web/page_editor_hook.ex

@@ -173,7 +173,10 @@ defmodule BerrypodWeb.PageEditorHook do
     if socket.assigns.site_editing do
       socket
     else
-      load_site_state(socket)
+      # Site tab uses branding settings from theme, so load theme state too
+      socket
+      |> maybe_enter_theme_mode()
+      |> load_site_state()
     end
   end