Retire terminal import sources with durable ownership and recovery v4

src/components/canvas/headless-imports.tsx

@@ -26,6 +26,7 @@ export function HeadlessImports({ engine, canvasId }: { engine: ProjectEngine; c
       {jobs.map((job, index) => <section className={styles.importJob} key={job.id} aria-label={`导入任务 ${index + 1}`}>
         <strong>{job.source?.name || `导入任务 ${index + 1}`}</strong>
         <p role="status">{["running","preparing"].includes(job.status) && job.source?.integrityVersion === 1 && !job.source.sha256 ? "正在校验源文件" : job.status === "preparing" ? "正在准备复制" : job.status === "running" ? "正在加入" : job.status === "paused" ? "已暂停" : job.status === "cancelled" ? "已停止" : job.status === "partial" ? "部分加入" : "已加入画布"} · {job.committedSourceKeys.length} 项{job.pending.length > 0 && `，${job.pending.length} 项等待`}</p>
+        {job.source?.retirement?.purgedAt !== undefined && <small>本地源文件已清理；画布内容和撤销记录保留。</small>}
         {job.error && <p>{reason(job.error)}</p>}
         <div className={styles.importActions}>
           {["running","preparing"].includes(job.status) && <button onClick={() => control(engine.imports.pause(job.id))}>暂停导入</button>}