Command Palette Activation on key down or key up setting

### Description of the new feature / enhancement

Hi, I was wondering about the possibility of having command palette get a setting to either trigger on a key down or key up stroke. Right now it triggers when the activation key is pressed down, but if I wanted to use the activation key with other keys for another shortcut I am unable to because command palette triggers and the shortcut activates in the command palette window instead of the window I intended to execute it in.

### Scenario when this would be used?

Ex: if command palette trigged on alt-s, but I have a program with a shortcut for alt-shift-s then I cannot use that shortcut in the program. I am forced to remap something to get around it. If command palette waited until the activation key comes up then I believe this issue would be solved. It would be nice to see this key down and key up customization in keyboard manager as well.

### Supporting information

_No response_

Start by reviewing how activation is handled in Command Palette and how keyboard shortcuts are configured in Keyboard Manager. Trace the current key-down behavior and identify the settings and UI paths that would need to expose key-down versus key-up activation. Done means the selected behavior works for Command Palette and Keyboard Manager without preventing combinations such as Alt-Shift-S.

Written by the indexing model from the issue text.