feat: Enhance GraphView component with connection creation delegation and fullscreen mode handling, and update ServerManager to support new connection logic

frontend/src/ServerManager.jsx

@@ -765,7 +765,13 @@ function ServerManager() {
           </div>
           <GraphView 
             servers={servers.filter(s => (!graphCountryFilter || s.country === graphCountryFilter) && (!graphProviderFilter || s.provider === graphProviderFilter))} 
-            connections={connections.filter(c => graphTunnelFilters[c.tunnelType])} 
+            connections={connections.filter(c => graphTunnelFilters[c.tunnelType])}
+            onCreateConnection={({ from, to }) => {
+              // Открываем модал добавления связи и проставляем выбранные узлы
+              setNewConnection(prev => ({ ...prev, from, to }));
+              const el = document.querySelector('#add-connection-anchor');
+              if (el) el.scrollIntoView({ behavior: 'smooth', block: 'center' });
+            }} 
           />
           <div className="mt-3">
             <div className="d-flex align-items-center gap-3 flex-wrap">
@@ -777,7 +783,7 @@ function ServerManager() {
           </div>
         </div>
       </div>
-      <div className="card w-100 mb-4">
+      <div id="add-connection-anchor" className="card w-100 mb-4">
         <div className="card-header">
           <h3 className="card-title mb-0">Добавить связь между серверами</h3>
         </div>