Refactor ScribeChapterComponent and offline handlers for seamless local and server operations

- Add stricter typings (`RefObject`) and improve type safety.
- Introduce conditional logic for `localBook` to

lib/models/Book.ts

@@ -69,6 +69,7 @@ export interface BookProps {
     desiredWordCount?: number;
     totalWordCount?: number;
     coverImage?: string;
+    localBook?: boolean;
     chapters?: ChapterProps[];
 }