高温氦气物性补全；三通四通能量计算bug修正

frontend/tests/e2e/alignment-guides.spec.ts

@@ -2,7 +2,7 @@ import { expect, test, type Locator, type Page } from "@playwright/test";
 import { buildAlignmentIndex, findAlignment, type AlignmentAnchor } from "../../src/alignmentGuides";
 import { componentCatalog, expectAllNodesInsideCanvas, prepareApp, wideProject } from "./fixtures";
 
-const KEY = "system-simulation-flow:project:demo-system";
+const KEY = "system-simulation-flow:autosave";
 const anchor = (nodeId: string, kind: AlignmentAnchor["kind"], x: number, y: number): AlignmentAnchor =>
   ({ id: `${nodeId}:${kind}`, nodeId, kind, x, y });