高温氦气物性补全；三通四通能量计算bug修正

frontend/tests/e2e/component-symbols.spec.ts

@@ -1782,7 +1782,7 @@ test("旧版 LMECHN1 工程会把固定参考端口迁移到动态最大编号",
   await page.getByRole("button", { name: "保存工程", exact: true }).click();
   const downgraded = await page.evaluate(() => {
     const key = Object.keys(localStorage).find((candidate) =>
-      candidate.startsWith("system-simulation-flow:project:"),
+      candidate === "system-simulation-flow:autosave",
     );
     const raw = key ? localStorage.getItem(key) : null;
     if (!key || !raw) {
@@ -1848,7 +1848,7 @@ test("旧版 LMECHN1 工程会把固定参考端口迁移到动态最大编号",
     .poll(() =>
       page.evaluate(() => {
         const key = Object.keys(localStorage).find((candidate) =>
-          candidate.startsWith("system-simulation-flow:project:"),
+          candidate === "system-simulation-flow:autosave",
         );
         const raw = key ? localStorage.getItem(key) : null;
         const project = raw ? JSON.parse(raw) : null;
@@ -1982,7 +1982,7 @@ test("旧版 FORC 工程会迁移为默认正向且不再依赖图标旋转", as
 
   const downgraded = await page.evaluate(() => {
     const key = Object.keys(localStorage).find((candidate) =>
-      candidate.startsWith("system-simulation-flow:project:"),
+      candidate === "system-simulation-flow:autosave",
     );
     const raw = key ? localStorage.getItem(key) : null;
     if (!key || !raw) {
@@ -2026,7 +2026,7 @@ test("旧版 FORC 工程会迁移为默认正向且不再依赖图标旋转", as
     .poll(() =>
       page.evaluate(() => {
         const key = Object.keys(localStorage).find((candidate) =>
-          candidate.startsWith("system-simulation-flow:project:"),
+          candidate === "system-simulation-flow:autosave",
         );
         const raw = key ? localStorage.getItem(key) : null;
         const project = raw ? JSON.parse(raw) : null;
@@ -2898,7 +2898,7 @@ test("恢复工程时采用当前目录端口并明确丢弃已删除端口的
   await page.getByRole("button", { name: "保存工程", exact: true }).click();
   const changed = await page.evaluate(() => {
     const key = Object.keys(window.localStorage).find((candidate) =>
-      candidate.startsWith("system-simulation-flow:project:"),
+      candidate === "system-simulation-flow:autosave",
     );
     const raw = key ? window.localStorage.getItem(key) : null;
     if (!key || !raw) {
@@ -3168,7 +3168,7 @@ test("AMESim canvas nodes use icon anchors and highlight only compatible free po
   await page.getByRole("button", { name: "保存工程", exact: true }).click();
   const routedEdge = await page.evaluate(() => {
     const raw = window.localStorage.getItem(
-      "system-simulation-flow:project:demo-system",
+      "system-simulation-flow:autosave",
     );
     const project = raw ? JSON.parse(raw) : null;
     return project?.edges?.[0] ?? null;
@@ -3659,7 +3659,7 @@ test("兼容接口接近时吸附为无连线接触连接，拖开后自动断
   await page.getByRole("button", { name: "保存工程", exact: true }).click();
   const savedEdge = await page.evaluate(() => {
     const raw = window.localStorage.getItem(
-      "system-simulation-flow:project:demo-system",
+      "system-simulation-flow:autosave",
     );
     const project = raw ? JSON.parse(raw) : null;
     return project?.edges?.[0] ?? null;
@@ -3823,7 +3823,7 @@ test("信号输出连接后隐藏且拒绝第二条连接", async ({ page }) =>
 
   await page.getByRole("button", { name: "保存工程", exact: true }).click();
   const addedLegacyFanOut = 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) {
       return false;
@@ -3860,7 +3860,7 @@ test("信号输出连接后隐藏且拒绝第二条连接", async ({ page }) =>
   await page.getByRole("button", { name: "保存工程", exact: true }).click();
   const normalizedEdgeIds = await page.evaluate(() => {
     const raw = window.localStorage.getItem(
-      "system-simulation-flow:project:demo-system",
+      "system-simulation-flow:autosave",
     );
     const project = raw ? JSON.parse(raw) : null;
     return (project?.edges ?? []).map((edge: { id?: string }) => edge.id);
@@ -3949,7 +3949,7 @@ test("一次拖动会吸附同一落点内的全部兼容接口", async ({ page
   await page.getByRole("button", { name: "保存工程", exact: true }).click();
   const savedEndpointKeys = await page.evaluate(() => {
     const raw = window.localStorage.getItem(
-      "system-simulation-flow:project:demo-system",
+      "system-simulation-flow:autosave",
     );
     const edges = raw ? (JSON.parse(raw)?.edges ?? []) : [];
     return edges.flatMap(