fix: 修复新建项目无响应问题

- 替换 prompt() 为 InputDialog Vue 模态组件
- 替换 alert()/confirm() 为 Electron showMessageBox IPC
- 添加 dialog:showMessage / dialog:showConfirm IPC 通道

src/views/ProjectEditor.vue

@@ -74,7 +74,11 @@ async function importFromFiles() {
 }
 
 async function handleDelete(relativePath) {
-  if (confirm(`确定删除 "${relativePath}"？`)) {
+  const ok = await window.api.dialog.showConfirm({
+    title: '删除确认',
+    message: `确定要删除 "${relativePath}" 吗？`
+  })
+  if (ok) {
     await store.removeFile(relativePath)
   }
 }