Strut windows committed zero height to layer-shell during
early init, causing a protocol error and session exit. Wrap
height and exclusionZone in Math.max(1, ...) for top bar
and dock.
Persisted gamingModeEnabled=true with hardcoded
gameCenterOpen=false hid panels with no overlay visible.
Initialize gameCenterOpen from the stored setting.
Fix HUD visibility regression from an emergency visible:true
override. Various null-guard and positioning fixes from
static analysis across the gaming shell QML.
Full-screen layer-shell overlay containing a game library grid
(XDG Game category, filtered via ApplicationListSearchModel) and
a panel of running tasks built on TaskManager.TasksModel.
Keyboard-navigable with directional focus between the running
tasks row and the game grid. A persistent HUD button lets the
user return after launching a game. Exiting gaming mode requires
an explicit confirmation dialog.
The overlay is a Window with LayerShell.LayerTop so it sits above
running application windows without covering system notifications.
