fix: hotkeys back working

Co-authored-by: Copilot <copilot@github.com>

lib/bds/desktop/shell_live/index.html.heex

@@ -1,4 +1,4 @@
-<div class="app" id="bds-shell-app">
+<div class="app" id="bds-shell-app" phx-window-keydown="shortcut">
   <div class="window-titlebar" data-region="title-bar">
     <div class="window-titlebar-menu-bar is-hidden">
       <button class="window-titlebar-menu-button" type="button">File</button>