Add a way to open Coder Desktop when it's not visible in the menu bar

Currently if a user's menu bar is full of other apps, causing Coder Desktop to be hidden, then there is no way to open Coder Desktop without first closing other apps until it shows up.

Bellow are some potential ways to solve the problem:

**Open Coder Desktop's tray menu on focus**

I'm not sure if this is possible but if it is it would be a nice workaround to the issue. This was also the behavior I was hoping was already working when I ran into this issue.

**Open a standalone window**

There seems to be two ways to implement this behavior:

1. Make Coder Desktop a "real" app rather than a background app.
This solves the problem but causes Coder Desktop to always be in the dock even when no windows are open which could be seen as annoying.

2. Ship two apps, one background one "real".
This is probably the best solution in terms of UX but with having to build and maintain two separate apps in one.

No se nombran archivos ni pruebas. Empieza examinando cómo está configurado Coder Desktop como aplicación de barra de menús o en segundo plano de macOS, y compara los enfoques propuestos de focus, ventana independiente y aplicación dual. Se considera completado cuando los usuarios pueden abrir Coder Desktop aunque el elemento de la barra de menús esté oculto, y el comportamiento resultante del dock coincide con la UX elegida.

Escrito por el modelo de indexación a partir del texto del issue.