Expand the spotlight bar from the island for Niri in the global view

### Feature Description

Using Niri, there is an option to launch the spotlight bar from the global view (with the four-finger gesture to show all the windows and workspaces).

But when using the Island, the spotlight appear in the center of the screen, not from the Island (the way it do when using keyboard shortcuts to launch spotlight).

Spotlight should always appear from the Island, whenever the method is used to launch it.

### Use Case

_No response_

### Compositor(s)

Niri

### If Other, please specify

_No response_

### Proposed Solution

_No response_

### Alternatives/Existing Solutions

_No response_

Start by reproducing the spotlight launch from Niri's global view with the four-finger gesture, then compare it with launching spotlight via keyboard shortcuts while using the Island. Done means spotlight consistently expands or appears from the Island in both launch paths.

Written by the indexing model from the issue text.