- Add `onCustomerCreated` callback to refresh customer list after creation.
- Integrate `showInfoToast` and `showSuccessToast` for validation and creation feedback.
- Prevent closing modal on backdrop click; add explicit cancel button.
- Refactor `addCustomer` to use `callApi` and centralized routes.
- Simplify customer fetching logic in `CustomersPage` with reusable function.
- 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.
