fix(web): reveal NFC peripherals after detection

tests/unit/test_extension_toy_publisher.py

@@ -143,6 +143,7 @@ def test_each_detection_publishes_three_frames_per_device_and_then_stops() -> No
 
         nfc["card"] = None
         assert wait_until(lambda: service.snapshot()["state"] == "waiting_for_nfc")
+        assert service.snapshot()["detected_nfc_ids"] == ["E113B203"]
         nfc["card"] = {"action": "present", "uid": "E113B203"}
         assert wait_until(lambda: len(publications) == 12)
         assert service.snapshot()["state"] == "burst_complete"
@@ -150,6 +151,29 @@ def test_each_detection_publishes_three_frames_per_device_and_then_stops() -> No
         service.close()
 
 
+def test_detected_devices_remain_latched_until_publisher_stops() -> None:
+    nfc: dict[str, Any] = {"card": {"action": "present", "uid": "E113B203"}}
+    service = NfcExtensionToyPublisher(
+        nfc_provider=lambda: nfc,
+        catalog_provider=lambda: [capability("light-on")],
+        publisher=lambda _payload: {"delivery_status": "queued"},
+        burst_window_s=0.03,
+        poll_interval_s=0.005,
+    )
+    service.start()
+    try:
+        assert wait_until(
+            lambda: service.snapshot()["detected_nfc_ids"] == ["E113B203"]
+        )
+        nfc["card"] = None
+        assert wait_until(lambda: service.snapshot()["state"] == "waiting_for_nfc")
+        assert service.snapshot()["detected_nfc_ids"] == ["E113B203"]
+    finally:
+        service.close()
+
+    assert service.snapshot()["detected_nfc_ids"] == []
+
+
 def test_no_matching_ability_publishes_nothing() -> None:
     nfc = {"card": {"action": "present", "uid": "E113B203"}}
     publications: list[dict[str, Any]] = []
@@ -168,6 +192,7 @@ def test_no_matching_ability_publishes_nothing() -> None:
         assert wait_until(
             lambda: service.snapshot()["state"] == "no_matching_extension"
         )
+        assert service.snapshot()["detected_nfc_ids"] == ["E113B203"]
         time.sleep(0.05)
         assert publications == []
     finally: