- Replace `showError` with a more versatile `showToast` utility.
- Add specific toast functions (`showErrorToast`, `showSuccessToast`, etc.) for better message handling.
- Remove `showError.ts` and migrate logic to `showToast.ts` for cleaner structure.
- Update `ErrorBoundary` and `useErrorHandler` to use the new `showToast` functions.
- Remove `CustomerRepository` and its methods for customer management and caching.
- Refactor customer-related pages (`[id]/page.tsx`, `customers/page.tsx`) to use direct `fetch` API calls.
- Update breadcrumb resolver to fetch data directly from the API.
- Simplify `addCustomer` use case to avoid repository dependency.
- Add in-memory caching for customer data in `CustomerRepository` to reduce API calls.
- Replace direct API calls with methods from `CustomerRepository`.
- Update customer-related pages (`[id]/page.tsx`, `customers/page.tsx`) to use `CustomerRepository` for data fetching.
- Adjust breadcrumb resolver to leverage `CustomerRepository`.
- Remove `axios` dependency from customer-related components.
