refactor(bar): modularize bar widgets and layout

config/BarLayout.qml

@@ -0,0 +1,29 @@
+pragma Singleton
+
+import Quickshell
+import qs.ui
+import qs.services
+
+Singleton {
+  id: root
+
+  function widget(name: string): url {
+    return `${Quickshell.shellPath("modules/bar")}/${name}.qml`;
+  }
+
+  property var left: [
+    root.widget("LauncherButton"),
+    root.widget("BatteryIndicator"),
+    root.widget("CavaVisualizer")
+  ]
+
+  property var center: [
+    root.widget("Workspaces")
+  ]
+
+  property var right: [
+    root.widget("SystemTrayWidget"),
+    root.widget("ClockWidget"),
+    root.widget("GhostButton")
+  ]
+}