fix: back button uses browser history instead of hardcoded /dashboard

src/pages/GroupDetailPage.jsx

@@ -1,5 +1,5 @@
 import React from "react";
-import { useNavigate, useParams } from "react-router-dom";
+import { useNavigate, useParams, useLocation } from "react-router-dom";
 import { OrderDetailPanel } from "../components/orders/OrderDetailPanel";
 import { Button } from "../components/UI/Button";
 import { Panel } from "../components/UI/Panel";
@@ -10,6 +10,7 @@ import { useOrderGroups } from "../hooks/useOrderGroups";
 export const GroupDetailPage = () => {
   const { groupId } = useParams();
   const navigate = useNavigate();
+  const location = useLocation();
   const { user } = useAuth();
   const userRole = user?.role;
 
@@ -48,10 +49,19 @@ export const GroupDetailPage = () => {
     allOrderGroups.find((g) => g.id === selectedOrderGroupId) ||
     null;
 
+  // Preserve the tab the user came from when going back
+  const handleGoBack = React.useCallback(() => {
+    if (window.history.length > 1) {
+      navigate(-1);
+    } else {
+      navigate("/dashboard");
+    }
+  }, [navigate]);
+
   return (
     <div className="mx-auto w-full max-w-3xl space-y-5">
       <div className="flex items-center justify-between">
-        <Button variant="ghost" onClick={() => navigate("/dashboard")} className="text-sm">
+        <Button variant="ghost" onClick={handleGoBack} className="text-sm">
           ← Назад к списку
         </Button>
       </div>