Initial commit: Add project files

frontend/src/shared/ui/VersionConflictDialog.vue

@@ -0,0 +1,17 @@
+<script setup lang="ts">
+const props = defineProps<{
+  open: boolean
+  currentVersion?: string
+}>()
+const emit = defineEmits<{ close: []; reload: [] }>()
+</script>
+
+<template>
+  <dialog :open="props.open" aria-labelledby="version-conflict-title">
+    <h2 id="version-conflict-title">버전 충돌</h2>
+    <p>다른 사용자가 먼저 변경했습니다. 최신 데이터를 다시 불러온 뒤 재검토하세요.</p>
+    <p v-if="props.currentVersion">현재 버전: {{ props.currentVersion }}</p>
+    <button type="button" @click="emit('reload')">최신 버전 불러오기</button>
+    <button type="button" @click="emit('close')">닫기</button>
+  </dialog>
+</template>