Deck bar takes focus when launched, should not

### What happened

Say when I'm writing something or doing something. When Deck bar is launched, it takes the focus, and I need to reach out to mouse, in order to gain focus of my window back again.

### Version

0.0.9

### Platform

macOS

### Which editor's theme

_No response_

### Where deck looked

```text

```

### Did the window close on its own?

```text

```

No file or test is named. Start by locating the macOS launch and window-focus handling for the Deck bar, reproduce the issue with another window active, and verify that launching Deck leaves the previous window focused.

Written by the indexing model from the issue text.