Remove SyncService and introduce context-based offline mode and state management

- Delete `SyncService` and its associated bidirectional synchronization logic.
- Add multiple context providers (`OfflineProvider`, `AlertProvider`, `LangContext`, `UserContext`, `SessionContext`, `WorldContext`, `SettingBookContext`) for contextual state management.
- Implement `SecureStorage` for OS-level secure data encryption and replace dependency on `SyncService` synchronization.
- Update localization files (`en.json`, `fr.json`) with offline mode and error-related strings.

context/ChapterContext.ts

@@ -0,0 +1,14 @@
+import {ChapterProps} from "@/lib/models/Chapter";
+import {createContext, Dispatch, SetStateAction} from "react";
+
+
+export interface ChapterContextProps {
+    chapter: ChapterProps | undefined,
+    setChapter: Dispatch<SetStateAction<ChapterProps | undefined>>
+}
+
+export const ChapterContext = createContext<ChapterContextProps>({
+    chapter: undefined,
+    setChapter: () => {
+    }
+})