fix: expose physical aliasing and delayed arrivals

tests/integration/builder-ui.test.js

@@ -133,6 +133,20 @@ test("Dataset Builder 전체 저장·재연결 흐름이 동일한 scene과 prev
     frame.style.width = "1400px";
     await new Promise((resolve) => windowObject.requestAnimationFrame(() => windowObject.requestAnimationFrame(resolve)));
 
+    dispatchValue(windowObject, documentObject.querySelector("#tone-frequency"), 5000, "input");
+    assert(
+      documentObject.querySelector("#source-list").textContent.includes("5000 Hz tone") &&
+        !documentObject.querySelector("#source-list").textContent.includes("ADC 3000 Hz alias"),
+      "tone card starts as baseband at 48 kHz sample rate",
+    );
+    dispatchValue(windowObject, documentObject.querySelector("#sample-rate"), 8000, "change");
+    assert(
+      documentObject.querySelector("#source-list").textContent.includes("5000 Hz tone → ADC 3000 Hz alias"),
+      "sample-rate change immediately rerenders the tone alias card",
+    );
+    dispatchValue(windowObject, documentObject.querySelector("#sample-rate"), 48000, "change");
+    dispatchValue(windowObject, documentObject.querySelector("#tone-frequency"), 1000, "input");
+
     const previewSamples = new Float32Array(2000);
     for (let index = 0; index < previewSamples.length; index += 1) {
       previewSamples[index] = Math.sin((2 * Math.PI * 440 * index) / 8000) * 0.12;