Fix settings tab 500 and env config grouping in UI

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/common/static/instance_embed.js

@@ -18,6 +18,7 @@
 
   let navToken = 0;
   let loadingTab = false;
+  let pendingTabLoad = null;
   const tabPanes = new Map();
   const tabBooted = new Set();
 
@@ -221,6 +222,10 @@
       credentials: "same-origin",
       headers: { "X-Instance-Soft-Nav": "1" },
     });
+    const ct = (r.headers.get("content-type") || "").toLowerCase();
+    if (!ct.includes("application/json")) {
+      throw new Error("加载失败（HTTP " + r.status + "）");
+    }
     const j = await r.json();
     if (!j.ok || !j.html) throw new Error(j.msg || "加载失败");
     return j.html;
@@ -325,7 +330,10 @@
       return;
     }
 
-    if (loadingTab) return;
+    if (loadingTab) {
+      pendingTabLoad = { tab: tab, opts: options };
+      return;
+    }
     const token = ++navToken;
     loadingTab = true;
     try {
@@ -343,6 +351,11 @@
       }
     } finally {
       if (token === navToken) loadingTab = false;
+      if (pendingTabLoad) {
+        const pending = pendingTabLoad;
+        pendingTabLoad = null;
+        if (pending.tab !== tab) void loadTab(pending.tab, pending.opts);
+      }
     }
   }