Add offline mode logic for main chapters and refine IPC handlers

- Integrate `OfflineContext` into `MainChapter` and related components to handle offline scenarios for chapter operations.
- Add conditional logic to toggle between server API requests and offline IPC handlers (`db:chapter:add`, `db:chapter:remove`).
- Extend `GET /book/story` endpoint to include `mainChapter` data.
- Refactor IPC handlers for chapters to accept structured data arguments with stricter typings.
- Update frontend key assignments for `BookList` component for improved rendering stability.

electron/ipc/chapter.ipc.ts

@@ -115,10 +115,13 @@ ipcMain.handle('db:chapter:add', createHandler<AddChapterData, string>(
 );
 
 // DELETE /chapter/remove - Remove chapter
-ipcMain.handle('db:chapter:remove', createHandler<string, boolean>(
-        function(userId: string, chapterId: string, lang: 'fr' | 'en'): boolean {
-            console.log(userId,chapterId,lang)
-            return Chapter.removeChapter(userId, chapterId, lang);
+interface RemoveChapterData {
+    chapterId: string;
+    bookId?: string;
+}
+ipcMain.handle('db:chapter:remove', createHandler<RemoveChapterData, boolean>(
+        function(userId: string, data: RemoveChapterData, lang: 'fr' | 'en'): boolean {
+            return Chapter.removeChapter(userId, data.chapterId, lang);
         }
     )
 );