Users can now choose how many records to display per page in the MassData grid (100, 1,000, 10,000, 100,000, or all). The backend and API client are updated to support nullable skip/take parameters, allowing "all" records to be fetched when desired. The pager and page count calculations are updated to reflect the selected page size, and the pager is hidden if only one page exists. Additional UI and CSS changes provide a combo box for page size selection. The API controller now treats take <= 0 as "no limit."
- Switch to custom edit model (MassDataEditModel) for popup editing, enabling granular field validation and UI control
- Replace default editors with explicit DxTextBox/DxCheckBox bindings
- Add AmountText field for string input and validation; validate and convert in OnEditModelSaving
- Implement duplicate customer check via new GetByCustomerNameAsync API method
- Show ValidationSummary in popup; manage validation state with ValidationMessageStore and EditContext
- Make popup header and width dynamic; show procedure ComboBox only for existing records
- Restore "New" button in grid command column
- Refactor CatalogsGrid to handle validation clearing in OnEditFieldChanged instead of OnTitleChanged
- General improvements to real-time validation feedback
Introduces MassData management to backend and Blazor frontend:
- Adds API endpoint for MassData count and paging
- Updates repository and controller for count support
- Implements MediatR query/handler for count
- Adds Blazor page and grid for viewing/editing MassData
- Registers MassDataApiClient and integrates with DI
- Supports paging, upsert, and UI feedback in grid
