feat: first take at UI app

lib/bds/ui/commands.ex

@@ -0,0 +1,16 @@
+defmodule BDS.UI.Commands do
+  @moduledoc false
+
+  alias BDS.UI.MenuBar
+
+  def handle_shortcut(state, shortcut) when is_map(shortcut) do
+    key = shortcut |> Map.get(:key, Map.get(shortcut, "key", "")) |> String.downcase()
+    primary = Map.get(shortcut, :meta, false) or Map.get(shortcut, :ctrl, false)
+
+    cond do
+      primary and key == "b" -> MenuBar.execute(state, :toggle_sidebar)
+      primary and key == "w" -> MenuBar.execute(state, :close_tab)
+      true -> state
+    end
+  end
+end