add commands experiment

docs/src/demos/Experiments/Commands/CommandsList.vue

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+<template>
+  <div class="items">
+    <button
+      class="item"
+      :class="{ 'is-selected': index === selectedIndex }"
+      v-for="(item, index) in items"
+      :key="index"
+      @click="selectItem(index)"
+    >
+      {{ item.title }}
+    </button>
+  </div>
+</template>
+
+<script>
+export default {
+  props: {
+    items: {
+      type: Array,
+      required: true,
+    },
+
+    command: {
+      type: Function,
+      required: true,
+    },
+  },
+
+  data() {
+    return {
+      selectedIndex: 0,
+    }
+  },
+
+  watch: {
+    items() {
+      this.selectedIndex = 0
+    },
+  },
+
+  methods: {
+    onKeyDown({ event }) {
+      if (event.key === 'ArrowUp') {
+        this.upHandler()
+        return true
+      }
+
+      if (event.key === 'ArrowDown') {
+        this.downHandler()
+        return true
+      }
+
+      if (event.key === 'Enter') {
+        this.enterHandler()
+        return true
+      }
+
+      return false
+    },
+
+    upHandler() {
+      this.selectedIndex = ((this.selectedIndex + this.items.length) - 1) % this.items.length
+    },
+
+    downHandler() {
+      this.selectedIndex = (this.selectedIndex + 1) % this.items.length
+    },
+
+    enterHandler() {
+      this.selectItem(this.selectedIndex)
+    },
+
+    selectItem(index) {
+      const item = this.items[index]
+
+      if (item) {
+        this.command(item)
+      }
+    },
+  },
+}
+</script>
+
+<style lang="scss" scoped>
+.items {
+  position: relative;
+  border-radius: 0.25rem;
+  background: white;
+  color: rgba(black, 0.8);
+  overflow: hidden;
+  font-size: 0.9rem;
+  box-shadow:
+    0 0 0 1px rgba(0, 0, 0, 0.1),
+    0px 10px 20px rgba(0, 0, 0, 0.1),
+  ;
+}
+
+.item {
+  display: block;
+  width: 100%;
+  text-align: left;
+  background: transparent;
+  border: none;
+  padding: 0.2rem 0.5rem;
+
+  &.is-selected,
+  &:hover {
+    color: #A975FF;
+    background: rgba(#A975FF, 0.1);
+  }
+}
+</style>