feat: Enhance GraphView with improved zoom functionality and label styling, including shadows for better visibility and aesthetics

frontend/src/GraphView.jsx

@@ -79,8 +79,11 @@ function GraphView({ servers, connections }) {
 
   // Контролы масштабирования
   const zoomBy = (factor) => {
+    if (!zoomRef.current || !svgRef.current) return;
     const svg = d3.select(svgRef.current);
-    svg.transition().duration(200).call(zoomRef.current.scaleBy, factor);
+    const node = svgRef.current;
+    const center = [node.clientWidth / 2, node.clientHeight / 2];
+    svg.transition().duration(220).call(zoomRef.current.scaleBy, factor, center);
   };
 
   const fitToView = () => {
@@ -263,6 +266,10 @@ function GraphView({ servers, connections }) {
           <filter id="cardShadow" x="-50%" y="-50%" width="200%" height="200%">
             <feDropShadow dx="0" dy="2" stdDeviation="3" floodOpacity="0.2" />
           </filter>
+          {/* Тень для ярлыков ссылок */}
+          <filter id="labelShadow" x="-50%" y="-50%" width="200%" height="200%">
+            <feDropShadow dx="0" dy="1" stdDeviation="2" floodOpacity="0.25" />
+          </filter>
         </defs>
         {/* Подложка сетки */}
         <rect width="100%" height="100%" fill="url(#grid)" />
@@ -309,36 +316,57 @@ function GraphView({ servers, connections }) {
                 style={{ vectorEffect: 'non-scaling-stroke' }}
               />
               
-              {/* Подпись связи */}
-              <rect
-                x={mx - 50}
-                y={my - 35}
-                width="80"
-                height="30"
-                rx="15"
-                fill="#ffffff"
-                stroke={style.color}
-                strokeWidth="1"
-              />
-               <text
-                x={mx - 10}
-                y={my - 18}
-                textAnchor="middle"
-                fontSize="11"
-                fill="#374151"
-                fontWeight="bold"
-              >
-                {connection.tunnelType}
-              </text>
-              <text
-                x={mx}
-                y={my - 3}
-                textAnchor="middle"
-                fontSize="9"
-                fill="#6b7280"
-              >
-                {connection.ipA} ⇄ {connection.ipB}
-              </text>
+              {/* Подпись связи: ярлык с подложкой и halo */}
+              {(() => {
+                const labelW = 140;
+                const labelH = 38;
+                const lx = cx - labelW / 2;
+                const ly = cy - labelH / 2 - 4; // слегка выше вершины
+                return (
+                  <g style={{ pointerEvents: 'none' }}>
+                    <rect
+                      x={lx}
+                      y={ly}
+                      width={labelW}
+                      height={labelH}
+                      rx="16"
+                      fill="#ffffff"
+                      stroke={style.color}
+                      strokeWidth="1"
+                      filter="url(#labelShadow)"
+                    />
+                    {/* Halo для заголовка */}
+                    <text
+                      x={cx}
+                      y={ly + 16}
+                      textAnchor="middle"
+                      fontSize="12"
+                      fontWeight="700"
+                      stroke="#ffffff"
+                      strokeWidth="3"
+                      strokeLinejoin="round"
+                      fill="#374151"
+                      style={{ paintOrder: 'stroke fill' }}
+                    >
+                      {connection.tunnelType}
+                    </text>
+                    {/* Линия IP с более мелким шрифтом */}
+                    <text
+                      x={cx}
+                      y={ly + 30}
+                      textAnchor="middle"
+                      fontSize="10"
+                      fill="#6b7280"
+                      stroke="#ffffff"
+                      strokeWidth="2"
+                      strokeLinejoin="round"
+                      style={{ paintOrder: 'stroke fill' }}
+                    >
+                      {connection.ipA} ⇄ {connection.ipB}
+                    </text>
+                  </g>
+                );
+              })()}
             </g>
           );
         })}