Integrate offline support and improve error handling across app

- Add `OfflineContext` to manage offline state and interactions within components.
- Refactor session logic in `ScribeControllerBar` and `page.tsx` to handle offline scenarios (e.g., check connectivity before enabling GPT features).
- Enhance offline PIN setup and verification with better flow and error messaging.
- Optimize database IPC handlers to initialize and sync data in offline mode.
- Refactor code to clean up redundant logs and ensure stricter typings.
- Improve consistency and structure in handling online and offline operations for smoother user experience.

components/book/AddNewBookForm.tsx

@@ -146,13 +146,14 @@ export default function AddNewBookForm({setCloseForm}: { setCloseForm: Dispatch<
                     publicationDate: publicationDate,
                     desiredWordCount: wordCount,
                 }, token, lang);
-                if (!bookId) {
-                    throw new Error(t('addNewBookForm.error.addingBook'));
-                }
             } else {
-                // Offline - call local database
                 bookId = await window.electron.invoke<string>('db:book:create', bookData);
             }
+            
+            if (!bookId) {
+                errorMessage(t('addNewBookForm.error.addingBook'))
+                return;
+            }
 
             const book: BookProps = {
                 bookId: bookId,