Preserve settings transfer sub-tab after manual transfer in embed shell.

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

lib/instance/instance_embed_lib.py

@@ -84,6 +84,11 @@ def embed_shell_enabled() -> bool:
     return (os.getenv("HUB_EMBED_SHELL") or "1").strip().lower() in ("1", "true", "yes", "on")
 
 
+_SETTINGS_SUB_TABS = frozenset(
+    {"nav", "password", "transfer", "export", "options_swap", "options_transfer"}
+)
+
+
 def redirect_to_embed_shell_if_enabled(page: str):
     """直连 /trade 等整页路由时,重定向到 embed 壳(顶栏常驻,tab 软切换)."""
     if not embed_shell_enabled():
@@ -93,6 +98,12 @@ def redirect_to_embed_shell_if_enabled(page: str):
     if (request.path or "").rstrip("/") == "/embed":
         return None
     q = {k: v for k, v in request.args.items()}
+    # embed 的 tab=页面名;系统设置内页签用 settings_tab,避免 /settings?tab=transfer 被覆盖成 tab=settings
+    if (page or "").strip() == "settings":
+        sub = (q.get("settings_tab") or "").strip()
+        legacy = (q.get("tab") or "").strip()
+        if not sub and legacy in _SETTINGS_SUB_TABS:
+            q["settings_tab"] = legacy
     q["tab"] = page
     q["embed"] = "1"
     return redirect("/embed?" + urlencode(q))
@@ -115,6 +126,11 @@ def rewrite_embed_dest(path: str, hub_theme: str | None = None) -> str:
     tab = path_to_embed_tab(split.path)
     q = dict(parse_qsl(split.query, keep_blank_values=True))
     if tab:
+        if tab == "settings":
+            sub = (q.get("settings_tab") or "").strip()
+            legacy = (q.get("tab") or "").strip()
+            if not sub and legacy in _SETTINGS_SUB_TABS:
+                q["settings_tab"] = legacy
         q["tab"] = tab
         q["embed"] = "1"
         ht = (hub_theme or q.get("hub_theme") or "").strip().lower()