update(examples): move examples into src dir

examples/src/SaveRestore/Controls.vue

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+<script lang="ts" setup>
+import { useZoomPanHelper, FlowExportObject, Node, useVueFlow } from '@braks/vue-flow'
+
+const flowKey = 'example-flow'
+const state = useStorage<FlowExportObject>(flowKey, {
+  nodes: [],
+  edges: [],
+  position: [NaN, NaN],
+  zoom: 1,
+})
+
+const getNodeId = () => `randomnode_${+new Date()}`
+
+const { setTransform } = useZoomPanHelper()
+const { nodes, edges, addNodes, setNodes, setEdges, instance, dimensions } = useVueFlow()
+
+const onSave = () => {
+  state.value = instance.value?.toObject()
+}
+
+const onRestore = () => {
+  const flow: FlowExportObject | null = state.value
+
+  if (flow) {
+    const [x = 0, y = 0] = flow.position
+    setNodes(state.value.nodes)
+    setEdges(state.value.edges)
+    setTransform({ x, y, zoom: flow.zoom || 0 })
+  }
+}
+
+const onAdd = () => {
+  const newNode = {
+    id: `random_node-${getNodeId()}`,
+    label: 'Added node',
+    position: { x: Math.random() * dimensions.value.width, y: Math.random() * dimensions.value.height },
+  } as Node
+  addNodes([newNode])
+}
+</script>
+<template>
+  <div class="save__controls">
+    <button @click="onSave">save</button>
+    <button @click="onRestore">restore</button>
+    <button @click="onAdd">add node</button>
+  </div>
+</template>

examples/src/SaveRestore/SaveRestoreExample.vue

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+<script lang="ts" setup>
+import Controls from './Controls.vue'
+import { VueFlow, Elements } from '@braks/vue-flow'
+
+const initialElements: Elements = [
+  { id: '1', label: 'Node 1', position: { x: 100, y: 100 } },
+  { id: '2', label: 'Node 2', position: { x: 100, y: 200 } },
+  { id: 'e1-2', source: '1', target: '2' },
+]
+
+const elements = ref(initialElements)
+</script>
+<template>
+  <VueFlow v-model="elements">
+    <Controls />
+  </VueFlow>
+</template>
+<style>
+@import 'save.css';
+</style>

examples/src/SaveRestore/save.css

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+.save__controls {
+  position: absolute;
+  right: 10px;
+  top: 10px;
+  z-index: 4;
+  font-size: 12px;
+}
+
+.save__controls button {
+  margin-left: 5px;
+}