fix(ui): unify connectivity labels and move contour refresh to header

tests/test_system_telemetry_api.py

@@ -497,3 +497,19 @@ def test_profile_apply_fails_closed_on_wrong_node_and_keeps_old_profile(
     assert error.value.status_code == 409
     assert WorkerProfileStore(tmp_path / "system").read().revision == 0
     assert not WorkerProfileStore(tmp_path / "system").path.exists()
+
+
+def test_receiver_failure_is_not_reported_as_worker_failure(monkeypatch):
+    import urllib.error
+
+    from k1link.web import system_telemetry_api as api
+
+    def unavailable(*args, **kwargs):
+        raise urllib.error.URLError("receiver down")
+
+    monkeypatch.setattr(api.urllib.request, "urlopen", unavailable)
+    result = api.run_worker_agent_probe(
+        api._profile_from_compute_contour(default_compute_contour())
+    )
+    assert result["error_code"] == "telemetry-receiver-unavailable"
+    assert result["reachable"] is False and result["raw"] is None