Fix post-close auto sell: restore missing spot min-size helpers used by sim sell.

Sell was silently failing on ImportError; surface sell result in close alert notes.

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

lib/common/static/hedge_plan.js

@@ -2940,7 +2940,11 @@
         headers: { "Content-Type": "application/json" },
         body: JSON.stringify({}),
       });
-      alert(d.msg || "已平仓 #" + (d.plan_id || planId));
+      var tip = d.msg || "已平仓 #" + (d.plan_id || planId);
+      if (Array.isArray(d.notes) && d.notes.length) {
+        tip += "\n" + d.notes.join("\n");
+      }
+      alert(tip);
       void loadLivePositions();
       void loadActivePlans();
       void loadHistory();