activate-linux: use implicit size

activate_linux/shell.qml

@@ -24,8 +24,8 @@ ShellRoot {
 				bottom: 50
 			}
 
-			width: content.width
-			height: content.height
+			implicitWidth: content.width
+			implicitHeight: content.height
 
 			color: "transparent"
 

wlogout/LogoutButton.qml

@@ -11,11 +11,10 @@ QtObject {
 
 	readonly property var process: Process {
 		command: ["sh", "-c", button.command]
-		manageLifetime: false
 	}
 
 	function exec() {
-		process.running = true;
+		process.startDetached();
 		Qt.quit();
 	}
 }

wlogout/shell.qml

@@ -4,7 +4,7 @@ import Quickshell
 ShellRoot {
 	WLogout {
 		LogoutButton {
-			command: "loginctl lock-screen"
+			command: "loginctl lock-session"
 			keybind: Qt.Key_K
 			text: "Lock"
 			icon: "lock"