Migrate from window.electron to tauri IPC functions across components

- Replaced `window.electron.invoke` calls with equivalent `tauri` function calls for all IPC interactions.
- Removed `electron.d.ts` TypeScript definitions as they are no longer needed.
- Updated related logic for offline/online state synchronization.
- Added `types.rs` and `shared/mod.rs` modules to support Tauri IPC integration with Rust enums and shared logic.
- Refactored IPC request queues to use updated handler names for consistency with Tauri.

lib/utils/db-error-handler.ts

@@ -1,6 +1,6 @@
 /**
  * Database Error Handler for Frontend
- * Handles errors from Electron IPC calls
+ * Handles errors from Tauri invoke calls
  */
 
 export interface SerializedError {
@@ -69,7 +69,7 @@ export async function handleDbOperation<T>(
  * const { data, error, loading, execute } = useDbOperation();
  *
  * const loadBooks = async () => {
- *   await execute(() => window.electron.invoke('db:book:getAll'));
+ *   await execute(() => tauri.getBooks());
  * };
  */
 export function useDbOperation<T>() {