feat: PLAN step 3 done

lib/bds/posts.ex

@@ -85,6 +85,12 @@ defmodule BDS.Posts do
           |> Repo.update()
           |> case do
             {:ok, updated_post} ->
+              if post.status == :published and updated_post.status == :published and
+                   Map.get(updates, :template_slug) != nil and
+                   updated_post.template_slug != post.template_slug do
+                :ok = rewrite_published_post(updated_post.id)
+              end
+
               :ok = Embeddings.sync_post(updated_post)
               :ok = PostLinks.sync_post_links(updated_post)
               :ok = Search.sync_post(updated_post)
@@ -560,7 +566,6 @@ defmodule BDS.Posts do
         :content,
         :author,
         :language,
-        :template_slug,
         :tags,
         :categories,
         :do_not_translate

lib/bds/ui/menu_bar.ex

@@ -1,6 +1,7 @@
 defmodule BDS.UI.MenuBar do
   @moduledoc false
 
+  alias BDS.UI.Registry
   alias BDS.UI.Workbench
 
   def default_groups(opts \\ []) do
@@ -82,8 +83,12 @@ defmodule BDS.UI.MenuBar do
   def execute(state, :toggle_sidebar), do: Workbench.toggle_sidebar(state)
   def execute(state, :toggle_panel), do: Workbench.toggle_panel(state)
   def execute(state, :toggle_assistant_sidebar), do: Workbench.toggle_assistant_sidebar(state)
-  def execute(state, :view_posts), do: %{state | active_view: :posts, sidebar_visible: true}
-  def execute(state, :view_media), do: %{state | active_view: :media, sidebar_visible: true}
+  def execute(state, :view_posts), do: open_sidebar_view(state, :posts)
+  def execute(state, :view_media), do: open_sidebar_view(state, :media)
+  def execute(state, :edit_preferences), do: open_singleton_editor(state, :settings)
+  def execute(state, :edit_menu), do: open_singleton_editor(state, :menu_editor)
+  def execute(state, :documentation), do: open_singleton_editor(state, :documentation)
+  def execute(state, :api_documentation), do: open_singleton_editor(state, :api_documentation)
 
   def execute(state, :close_tab) do
     case state.active_tab do
@@ -92,8 +97,48 @@ defmodule BDS.UI.MenuBar do
     end
   end
 
+  def execute(state, command_id) when is_atom(command_id) do
+    with {:ok, view_id} <- sidebar_view_command(command_id) do
+      open_sidebar_view(state, view_id)
+    else
+      :error ->
+        case singleton_editor_command(command_id) do
+          {:ok, route_id} -> open_singleton_editor(state, route_id)
+          :error -> state
+        end
+    end
+  end
+
   def execute(state, _command_id), do: state
 
+  defp open_sidebar_view(state, view_id) do
+    %{state | active_view: view_id, sidebar_visible: true}
+  end
+
+  defp open_singleton_editor(state, route_id) do
+    Workbench.open_tab(state, route_id, Atom.to_string(route_id), :pin)
+  end
+
+  defp sidebar_view_command(command_id) do
+    with "view_" <> suffix <- Atom.to_string(command_id),
+         view_id = String.to_atom(suffix),
+         %{} <- Registry.sidebar_view(view_id) do
+      {:ok, view_id}
+    else
+      _other -> :error
+    end
+  end
+
+  defp singleton_editor_command(command_id) do
+    with "open_" <> suffix <- Atom.to_string(command_id),
+         route_id = String.to_atom(suffix),
+         %{singleton: true} <- Registry.editor_route(route_id) do
+      {:ok, route_id}
+    else
+      _other -> :error
+    end
+  end
+
   defp view_items(dev_mode?) do
     items = [
       %{id: :view_posts},