Add close button in settings dialog in mobile mode

(cherry picked from commit 7f1e1bcf51)

external/libphysis

@@ -1 +1 @@
-Subproject commit 6e0b38612bcde1597c366bf341db02c8549299be
+Subproject commit ca98182e41ea2e06af831e1613343c7172cfd6ce

launcher/ui/Main.qml

@@ -21,11 +21,16 @@ Kirigami.ApplicationWindow {
 
     property bool checkedAutoLogin: false
 
-    pageStack.initialPage: Kirigami.Page {
+    pageStack {
+        globalToolBar {
+            style: Kirigami.ApplicationHeaderStyle.ToolBar
+        }
+        initialPage: Kirigami.Page {
             Kirigami.LoadingPlaceholder {
                 anchors.centerIn: parent
             }
         }
+    }
 
     onClosing: (close) => {
         if (LauncherCore.isPatching()) {

launcher/ui/Settings/SettingsPage.qml

@@ -2,12 +2,31 @@
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 import org.kde.kirigamiaddons.settings as KirigamiSettings
+import org.kde.kirigami as Kirigami
+import org.kde.kirigamiaddons.components as KirigamiComponents
 
 import zone.xiv.astra
 
 KirigamiSettings.CategorizedSettings {
     id: settingsPage
 
+    KirigamiComponents.FloatingButton {
+        anchors {
+            right: parent.right
+            bottom: parent.bottom
+        }
+
+        z: 100
+        margins: Kirigami.Units.largeSpacing
+        visible: LauncherCore.isSteamDeck
+
+        action: Kirigami.Action {
+            text: i18nc("@action:button Close Settings")
+            icon.name: "dialog-close-symbolic"
+            onTriggered: pageStack.layers.pop()
+        }
+    }
+
     actions: [
         KirigamiSettings.SettingAction {
             actionName: "general"