feat(settings): add compositor section & restructured settings

- add dedicated Compositor pages for comp specifc features
- add Dank Bar Appearance subsection
- improve lazy loading, caching, search routing, & IPC navigation
- standardized responsive Setting categories from global animations

quickshell/Common/SettingsUiState.qml

@@ -0,0 +1,25 @@
+pragma Singleton
+
+import QtQuick
+import Quickshell
+import qs.Common
+
+Singleton {
+    id: root
+
+    property string selectedBarId: "default"
+
+    function normalizeSelectedBar() {
+        if (SettingsData.getBarConfig(selectedBarId))
+            return;
+        selectedBarId = SettingsData.barConfigs[0]?.id ?? "default";
+    }
+
+    Connections {
+        target: SettingsData
+
+        function onBarConfigsChanged() {
+            root.normalizeSelectedBar();
+        }
+    }
+}