feat(web): 刮削设置与对话框加「更新」覆盖方式,内容没变的跳过不逐条列出

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Cxwgnn2pbzQ7rXv3rq7fei

apps/web/app/components/files/mock.ts

@@ -704,7 +704,7 @@ let seq = 0;
 const SCRAPES = new Map<string, ScrapeRecord>();
 function mockScrape(b: {
   items: { root: string; path: string; mediaEntityId?: string; external?: { externalId: string } }[];
-  mode?: "missing" | "overwrite";
+  mode?: "missing" | "overwrite" | "update";
 }) {
   const records: ScrapeRecord[] = [];
   const needsChoice: unknown[] = [];