feat: add message float components

frontend_nuxt/components/MessageFloat.vue

@@ -0,0 +1,44 @@
+<template>
+  <div v-if="state.open" class="message-float">
+    <iframe :src="frameSrc" class="message-frame" />
+  </div>
+</template>
+
+<script setup>
+import { computed } from 'vue'
+import { useMessageFloat } from '~/composables/useMessageFloat'
+
+const state = useMessageFloat()
+
+const frameSrc = computed(() => {
+  const base = state.value.path || '/message-box'
+  return base + (base.includes('?') ? '&' : '?') + 'float=1'
+})
+</script>
+
+<style scoped>
+.message-float {
+  position: fixed;
+  bottom: 0;
+  right: 0;
+  width: 380px;
+  height: 500px;
+  box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
+  z-index: 2000;
+  background: var(--background-color);
+}
+
+.message-frame {
+  width: 100%;
+  height: 100%;
+  border: none;
+}
+
+@media (max-width: 600px) {
+  .message-float {
+    width: 100%;
+    height: 100%;
+    right: 0;
+  }
+}
+</style>