Overlayed blocks mouse events

[joshqou]

Describe the bug
Overlayed blocks mouse events on GNOME wayland when above other applications.

To Reproduce
Steps to reproduce the behavior:

1. Open overlayed and position at the top left of the screen
2. Set the window to always appear above other applications
3. Pin overlayed to hide the window header
4. Open a game which has UI elements at the top left

Desktop (please complete the following information):

• OS: Fedora Workstation 41 (GNOME Shell 47.1)
• Version: Overlayed 0.6.2 (flatpak)

Related to flathub/dev.overlayed.Overlayed#2. Overlayed renders as expected, only clickthrough is broken.

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If wayland doesn't provide a way to passthrough mouse events, maybe overlayed could hide itself when the mouse goes over it while pinned?