Linux: compact HUD window blocks clicks and steals focus in its transparent area

[Nuu-maan]

On Linux the HUD runs without mouse passthrough (isHudOverlayMousePassthroughSupported() is false), so it lives in a fixed 860x160 transparent window (electron/hudOverlayBounds.ts, NON_PASSTHROUGH_HUD_WIDTH_DIP/NON_PASSTHROUGH_HUD_COMPACT_HEIGHT_DIP). The visible bar is roughly 400x56, so most of that window is an invisible region that still swallows clicks on whatever is underneath and, with Hyprland's default follow_mouse = 1, takes keyboard focus whenever the pointer crosses it.

Observed on Omarchy (Hyprland 0.56.2, Wayland) with both the 1.3.3 AppImage and a dev build from main.

Possible follow-ups:

• shrink the compact window to the bar's actual size and only grow it while a menu is open (Fix HUD menus and cursor telemetry on Linux Wayland (Hyprland/Omarchy) #863 already does the menu part);
• on Hyprland, use the IPC cursor position to toggle setIgnoreMouseEvents from the main process, since Wayland cannot forward pointer events through a click-through window.