feat: more work on UI cleanup

lib/bds/desktop/shell_controller.ex

@@ -4,4 +4,21 @@ defmodule BDS.Desktop.ShellController do
   def index_html do
     BDS.UI.ShellPage.render()
   end
+
+  def task_status_json do
+    Jason.encode!(BDS.Tasks.status_snapshot())
+  end
+
+  def command_json(payload) when is_map(payload) do
+    action = Map.get(payload, "action") || Map.get(payload, :action)
+    params = Map.get(payload, "params") || Map.get(payload, :params) || %{}
+
+    case BDS.Desktop.ShellCommands.execute(action, params) do
+      {:ok, result} -> Jason.encode!(%{status: "ok", result: result})
+      {:error, error} -> Jason.encode!(%{status: "error", error: normalize_error(error)})
+    end
+  end
+
+  defp normalize_error(error) when is_map(error), do: error
+  defp normalize_error(error), do: %{message: inspect(error)}
 end