feat: lazy-load security center (Closes #605)

tests/test_feature_loader.py

@@ -89,3 +89,22 @@ console.log(JSON.stringify({first,second,failedStatus,opened,appends:state.appen
         "opened": 1,
         "appends": 2,
     }
+
+
+def test_security_center_failure_is_accessible_and_retryable_from_active_devices():
+    result = run_loader("""
+const trigger={disabled:false}; const status={textContent:''}; let opened=0;
+const loader=createFeatureLoader({document, urls:{'security-center':'feature-security.js'}, timeoutMs:100});
+const failed=loader.run('security-center',{trigger,status,retryLabel:'Tap Active devices to retry.'},()=>{opened++;});
+state.node.onerror(); const first=await failed; const failedStatus=status.textContent;
+const retry=loader.run('security-center',{trigger,status,retryLabel:'Tap Active devices to retry.'},()=>{opened++;});
+state.node.onload(); const second=await retry;
+console.log(JSON.stringify({first,second,failedStatus,opened,appends:state.appends}));
+""")
+    assert result == {
+        "first": False,
+        "second": True,
+        "failedStatus": "Security center could not load. Tap Active devices to retry.",
+        "opened": 1,
+        "appends": 2,
+    }