Refactor and extend offline synchronization logic across components and services

- Integrated sync queue mechanisms with `LocalSyncQueueContext` for offline data handling.
- Updated key sync-related services (e.g., book, chapter, series) to support offline-first functionality.
- Removed redundant database fetch methods to optimize repository logic and improve maintainability.
- Enhanced Tauri IPC usage for sync operations and removed legacy methods in Rust services.

components/series/AddNewSeriesForm.tsx

@@ -30,8 +30,10 @@ export default function AddNewSeriesForm({setCloseForm, onSeriesCreated}: AddNew
     const {isCurrentlyOffline} = useContext(OfflineContext);
     const {
         serverSyncedBooks,
-        setServerSyncedBooks
+        setServerSyncedBooks,
+        localSyncedBooks
     }: BooksSyncContextProps = useContext<BooksSyncContextProps>(BooksSyncContext);
+    const useLocal: boolean = isDesktop && isCurrentlyOffline();
     const [name, setName] = useState<string>('');
     const [description, setDescription] = useState<string>('');
     const [selectedBookIds, setSelectedBookIds] = useState<string[]>([]);
@@ -83,6 +85,8 @@ export default function AddNewSeriesForm({setCloseForm, onSeriesCreated}: AddNew
                             : book
                     )
                 );
+            } else {
+                setServerSyncedBooks((prev: SyncedBook[]): SyncedBook[] => [...prev]);
             }
             
             if (onSeriesCreated) {
@@ -150,7 +154,7 @@ export default function AddNewSeriesForm({setCloseForm, onSeriesCreated}: AddNew
                     )}
                 </div>
                 
-                {serverSyncedBooks.length === 0 ? (
+                {(useLocal ? localSyncedBooks : serverSyncedBooks).length === 0 ? (
                     <div className="text-center py-6 text-muted">
                         <Book className="w-8 h-8 mb-2 opacity-50" strokeWidth={1.75}/>
                         <p>{t("addNewSeriesForm.noBooks")}</p>
@@ -158,7 +162,7 @@ export default function AddNewSeriesForm({setCloseForm, onSeriesCreated}: AddNew
                 ) : (
                     <div
                         className="max-h-48 overflow-y-auto rounded-xl border border-secondary bg-tertiary">
-                        {serverSyncedBooks.map((book: SyncedBook) => {
+                        {(useLocal ? localSyncedBooks : serverSyncedBooks).map((book: SyncedBook) => {
                             const isSelected: boolean = selectedBookIds.includes(book.id);
                             return (
                                 <button