[Feature Request] Access .desktop file sub-actions from the launcher

[Etienne-TR]

Add an option in settings to list all actions from .desktop files (for example, also display "Open Private Window", "Open Profile Manager" for Firefox).

Arguments:

• Saves time by allowing direct access to specific modes/functions
• Enhances discoverability of application capabilities

If adding an option doesn't seem like a good idea, two alternatives in order of preference:

1. List actions and sub-actions from .desktop files by default (the simplest way)
2. Add a way to list sub-actions: right-click / Shift+Enter / right arrow, perhaps a small "+" icon if sub-actions exist

[Etienne-TR]

This feature request is related to this one: #274