Integrate local database management and IPC handlers into Electron

- Add comprehensive IPC handlers for database operations like books, chapters, characters, and conversations.
- Implement local database initialization and user data encryption.
- Update preload script paths for consistent environment handling.
- Modify `page.tsx` to initialize local database within Electron environment.
- Add new dependencies including `node-sqlite3-wasm` and `electron-rebuild`.

components/book/BookList.tsx

@@ -244,8 +244,8 @@ export default function BookList() {
                                     <div
                                         className="flex justify-between items-center w-full max-w-5xl mx-auto mb-6 px-6">
                                         <h2 className="text-3xl text-text-primary capitalize font-['ADLaM_Display'] flex items-center gap-3">
-                                            <span className="w-1 h-8 bg-primary rounded-full"></span>
-                                            {category}
+                                            <span key="icon" className="w-1 h-8 bg-primary rounded-full"></span>
+                                            <span key="title">{category}</span>
                                         </h2>
                                         <span
                                             className="text-muted text-lg font-medium bg-secondary/30 px-4 py-1.5 rounded-full">{books.length} {t("bookList.works")}</span>