高温氦气物性补全；三通四通能量计算bug修正

frontend/tests/e2e/modeling-actions.spec.ts

@@ -86,7 +86,7 @@ test("新版存档拒绝目录未定义的参数，保留当前有效工程及 X
   await page.getByRole("button", { name: "保存工程", exact: true }).click();
 
   await page.evaluate(() => {
-    const key = "system-simulation-flow:project:demo-system";
+    const key = "system-simulation-flow:autosave";
     const raw = window.localStorage.getItem(key);
     if (!raw) {
       throw new Error("测试工程未保存");
@@ -119,7 +119,7 @@ test("XML 参数使用可往返的双精度文本", async ({ page }) => {
   await page.getByRole("button", { name: "保存工程", exact: true }).click();
 
   await page.evaluate(() => {
-    const key = "system-simulation-flow:project:demo-system";
+    const key = "system-simulation-flow:autosave";
     const raw = window.localStorage.getItem(key);
     if (!raw) {
       throw new Error("测试工程未保存");
@@ -302,7 +302,7 @@ test("复制已连接组件时副本 ID 避让画布中的同名节点且不会
   };
   await page.addInitScript((storedProject) => {
     window.localStorage.setItem(
-      "system-simulation-flow:project:demo-system",
+      "system-simulation-flow:autosave",
       JSON.stringify(storedProject),
     );
   }, project);