fix: read Static and disable quality when a system setting withholds the scene

src/components/DriveControls.vue

@@ -94,12 +94,16 @@ const statusText = computed(() => {
   return null;
 });
 
-/** The scene was lost or never started: the quality choice has nothing to
+/** The scene was lost, never started, or is withheld by a system setting
- * act on, so it reads Static and is disabled rather than claiming High. */
+ * (reduced motion, data saver): the quality choice has nothing to act on, so
+ * it reads Static and is disabled rather than claiming High. Visitor choices
+ * (pause, saved Static) keep it enabled so they can be changed back. */
 const visualsUnavailable = computed(
   () =>
-    props.policy.reason === "full" &&
+    props.policy.reason === "system-reduce" ||
-    (props.sceneStatus === "failed" || props.sceneStatus === "static"),
+    props.policy.reason === "data-saver" ||
+    (props.policy.reason === "full" &&
+      (props.sceneStatus === "failed" || props.sceneStatus === "static")),
 );
 
 const runAction = (): void => {

tests/unit/SceneCanvas.test.ts

@@ -390,6 +390,25 @@ describe("DriveControls", () => {
     expect(select.element.value).toBe("static");
     wrapper.unmount();
   });
+
+  it.each(["system-reduce", "data-saver"] as const)(
+    "disables the quality choice and reads Static under %s",
+    async (reason) => {
+      const wrapper = mount(DriveControls, {
+        props: {
+          policy: policy({ reason, allowSceneRequest: false, allowAutomaticVideo: false, maximumTier: "static" }),
+          maximumQuality: "high",
+          sceneStatus: "idle",
+          audioState: { kind: "idle" },
+        },
+      });
+      await wrapper.get('[aria-label="Drive settings"]').trigger("click");
+      const select = wrapper.get<HTMLSelectElement>('[aria-label="Quality control"]');
+      expect(select.element.disabled).toBe(true);
+      expect(select.element.value).toBe("static");
+      wrapper.unmount();
+    },
+  );
 });
 
 describe("JourneyHud", () => {