plugin: rust-side modules + theme services with serde-typed config

shell/services/ThemeUtil.qml

@@ -0,0 +1,23 @@
+pragma Singleton
+
+import QtQuick
+import NovaStats as NS
+import "." as S
+
+// Helpers that need QML-side state (PowerProfileService) or compute over the
+// raw theme primitives. Plain values come straight from NS.ThemeService.
+QtObject {
+    id: root
+
+    // Effective reduced-motion: configured value OR power-saver active.
+    readonly property bool reducedMotion: NS.ThemeService.reducedMotionConfig || S.PowerProfileService.powerSaver
+
+    // Green -> yellow -> red gradient for 0-100% load/usage values.
+    function loadColor(pct) {
+        const t = Math.max(0, Math.min(100, pct)) / 100;
+        const a = t < 0.5 ? NS.ThemeService.base0B : NS.ThemeService.base0A;
+        const b = t < 0.5 ? NS.ThemeService.base0A : NS.ThemeService.base08;
+        const u = t < 0.5 ? t * 2 : (t - 0.5) * 2;
+        return Qt.rgba(a.r + (b.r - a.r) * u, a.g + (b.g - a.g) * u, a.b + (b.b - a.b) * u, 1);
+    }
+}