Remove unused OfflineIndicator, OfflineSyncDetails, and OfflineSyncManager components

- Deleted obsolete offline-related components as they are no longer in use.
- Simplified imports and removed related context dependencies.
- Updated synchronization and toggle switch handling in `CharacterComponent`, `WorldSetting`, and `LocationComponent` to improve consistency.

components/book/settings/guide-line/GuideLineSetting.tsx

@@ -93,13 +93,13 @@ function GuideLineSetting(props: any, ref: any) {
                 }
             }
             if (response) {
-                setPlotSummary(response.globalResume);
+                setPlotSummary(response.globalResume || '');
                 setVerbTense(response.verbeTense?.toString() || '');
                 setNarrativeType(response.narrativeType?.toString() || '');
                 setDialogueType(response.dialogueType?.toString() || '');
-                setToneAtmosphere(response.atmosphere);
+                setToneAtmosphere(response.atmosphere || '');
                 setLanguage(response.langue?.toString() || '');
-                setThemes(response.themes);
+                setThemes(response.themes || '');
             }
         } catch (e: unknown) {
             if (e instanceof Error) {