Feature: Switch to Windows file transfer dialog when Files is closed

### What's the Problem?

If you close the files window during a large file transfer, then it's impossible to see the progress if even if you reopen it.

### Solution/Idea

Add an option to show the default windows file transfer popup, instead of adding it to the queue window in the top right.

### Alternatives

Another solution would also be to make file transfer queues global between all files windows, instead of each window having their own queue.

### Priorities

_No response_

### Files Version

2.1.5.0

### Windows Version

21H2

### Comments

_No response_

Start by locating the file-transfer queue and Files window code, then trace what happens when a window closes during a large transfer. Compare the existing queue-window progress behavior with the Windows file transfer popup and clarify whether the change is an option or a global queue; done means transfer progress remains visible after closing the Files window.

Written by the indexing model from the issue text.