refactor(examples): switch examples from cra to nextjs

examples/nextjs/pages/TouchDevice/index.tsx

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+import React, { useCallback } from 'react';
+import ReactFlow, {
+  Node,
+  Edge,
+  useNodesState,
+  useEdgesState,
+  Position,
+  Connection,
+  addEdge,
+} from '@react-flow/core';
+
+import styles from './touch-device.module.css';
+
+const initialNodes: Node[] = [
+  {
+    id: '1',
+    data: { label: 'Node 1' },
+    position: { x: 100, y: 100 },
+    sourcePosition: Position.Right,
+    targetPosition: Position.Left,
+  },
+  {
+    id: '2',
+    data: { label: 'Node 2' },
+    position: { x: 300, y: 100 },
+    sourcePosition: Position.Right,
+    targetPosition: Position.Left,
+  },
+];
+
+const initialEdges: Edge[] = [];
+
+const TouchDeviceFlow = () => {
+  const [nodes, , onNodesChange] = useNodesState(initialNodes);
+  const [edges, setEdges, onEdgesChange] = useEdgesState(initialEdges);
+  const onConnect = useCallback(
+    (connection: Connection) => setEdges((eds) => addEdge(connection, eds)),
+    [setEdges]
+  );
+  const onConnectStart = useCallback(() => console.log('connect start'), []);
+  const onConnectStop = useCallback(() => console.log('connect end'), []);
+  const onClickConnectStart = useCallback(
+    () => console.log('click connect start'),
+    []
+  );
+  const onClickConnectStop = useCallback(
+    () => console.log('click connect end'),
+    []
+  );
+
+  return (
+    <ReactFlow
+      nodes={nodes}
+      edges={edges}
+      onConnect={onConnect}
+      onNodesChange={onNodesChange}
+      onEdgesChange={onEdgesChange}
+      onConnectStart={onConnectStart}
+      onConnectStop={onConnectStop}
+      onClickConnectStart={onClickConnectStart}
+      onClickConnectStop={onClickConnectStop}
+      className={styles.flow}
+    />
+  );
+};
+
+export default TouchDeviceFlow;

examples/nextjs/pages/TouchDevice/touch-device.module.css

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+.flow :global .react-flow__handle {
+  width: 20px;
+  height: 20px;
+  border-radius: 3px;
+  background-color: #9f7aea;
+}
+
+.flow :global .react-flow__handle.connecting {
+  animation: bounce 1600ms infinite ease-out;
+}
+
+@keyframes bounce {
+  0% {
+    transform: translate(0, -50%) scale(1);
+  }
+  50% {
+    transform: translate(0, -50%) scale(1.1);
+  }
+}