feat(bar/dock): add 'Hide When Fullscreen' opt-out toggles (#2349)

Adds per-bar 'fullscreenDetection' and global 'dockHideOnFullscreen'
settings to gate CompositorService.hasFullscreenToplevelOnScreen()

quickshell/Common/SettingsData.qml

@@ -589,6 +589,7 @@ Singleton {
     property bool showDock: false
     property bool dockAutoHide: false
     property bool dockSmartAutoHide: false
+    property bool dockHideOnFullscreen: true
     property bool dockGroupByApp: false
     property bool dockRestoreSpecialWorkspaceOnClick: false
     property bool dockOpenOnOverview: false

quickshell/Common/settings/SettingsSpec.js

@@ -329,6 +329,7 @@ var SPEC = {
     showDock: { def: false },
     dockAutoHide: { def: false },
     dockSmartAutoHide: { def: false },
+    dockHideOnFullscreen: { def: true },
     dockGroupByApp: { def: false },
     dockRestoreSpecialWorkspaceOnClick: { def: false },
     dockOpenOnOverview: { def: false },
@@ -491,6 +492,7 @@ var SPEC = {
             popupGapsAuto: true,
             popupGapsManual: 4,
             maximizeDetection: true,
+            fullscreenDetection: true,
             scrollEnabled: true,
             scrollXBehavior: "column",
             scrollYBehavior: "workspace",