feat(ArcExtender): New center modal option in ConnectedMode

quickshell/Common/SettingsData.qml

@@ -242,6 +242,8 @@ Singleton {
     onFrameCloseGapsChanged: saveSettings()
     property string frameLauncherEmergeSide: "bottom"
     onFrameLauncherEmergeSideChanged: saveSettings()
+    property bool frameLauncherArcExtender: false
+    onFrameLauncherArcExtenderChanged: saveSettings()
     readonly property string frameModalEmergeSide: frameLauncherEmergeSide === "top" ? "bottom" : "top"
     property string frameMode: "separate"
     onFrameModeChanged: saveSettings()

quickshell/Common/settings/SettingsSpec.js

@@ -565,6 +565,7 @@ var SPEC = {
     frameBlurEnabled: { def: true },
     frameCloseGaps: { def: false },
     frameLauncherEmergeSide: { def: "bottom" },
+    frameLauncherArcExtender: { def: false },
     frameMode: { def: "separate" }
 };