feat: Enhance GraphView with localStorage integration for node position persistence and improve edge text styling for better visualization in the topology graph.

frontend/src/GraphView.jsx

@@ -20,6 +20,7 @@ function GraphView({ servers, connections, onCreateConnection }) {
   const containerRef = useRef(null);
   const [isFullscreen, setIsFullscreen] = useState(false);
   const [highlightedNodeId, setHighlightedNodeId] = useState(null);
+  const STORAGE_KEY = 'graph-layout-servers-v1';
 
   const getTunnelStyle = useCallback((tunnelType) => {
     const map = {
@@ -53,15 +54,62 @@ function GraphView({ servers, connections, onCreateConnection }) {
   }, []);
 
   const initialNodesData = useMemo(() => {
-    return (servers || []).map((s, i) => ({
+    // Базовая сетка
+    const baseNodes = (servers || []).map((s, i) => ({
       id: String(s.ip),
       type: 'server',
       position: computeGridPosition(i, servers.length),
       data: { server: s },
     }));
+
+    // Переопределяем позиции из localStorage, если есть
+    if (typeof window !== 'undefined') {
+      try {
+        const raw = window.localStorage.getItem(STORAGE_KEY);
+        if (raw) {
+          const saved = JSON.parse(raw) || {};
+          return baseNodes.map((n) => {
+            const savedPos = saved[n.id];
+            if (savedPos && typeof savedPos.x === 'number' && typeof savedPos.y === 'number') {
+              return { ...n, position: { x: savedPos.x, y: savedPos.y } };
+            }
+            return n;
+          });
+        }
+      } catch {
+        // игнорируем проблемы с localStorage
+      }
+    }
+
+    return baseNodes;
   }, [servers, computeGridPosition]);
 
-  const [nodes, setNodes, onNodesChange] = useNodesState(initialNodesData);
+  const [nodes, setNodes, onNodesChangeInternal] = useNodesState(initialNodesData);
+
+  // Обёртка над onNodesChange: обновляем состояние и сохраняем позиции в localStorage
+  const onNodesChange = useCallback(
+    (changes) => {
+      onNodesChangeInternal(changes);
+      // Сохраняем только позиции
+      setNodes((current) => {
+        if (typeof window !== 'undefined') {
+          try {
+            const layout = {};
+            current.forEach((n) => {
+              if (n.position) {
+                layout[n.id] = { x: n.position.x, y: n.position.y };
+              }
+            });
+            window.localStorage.setItem(STORAGE_KEY, JSON.stringify(layout));
+          } catch {
+            // ignore
+          }
+        }
+        return current;
+      });
+    },
+    [onNodesChangeInternal, setNodes]
+  );
 
   useEffect(() => {
     setNodes(initialNodesData);