backend call for dates implemented

[StuartFerguson]

closes #601

[Copilot]

Pull request overview

This pull request implements backend API calls for fetching comparison dates from an estate reporting service. The PR introduces a new BusinessLogic layer that separates concerns and implements request handlers using MediatR pattern to make actual API calls instead of returning mock data.

Changes:

• Introduced new EstateManagementUI.BusinessLogic project with API client, request handlers, and data transfer objects
• Implemented DateRequestHandler to fetch comparison dates from the backend API
• Refactored code to use SimpleResults Result type instead of custom Result wrapper
• Added model conversion layer (ModelFactory) to bridge BusinessLogic and BlazorServer models

Reviewed changes

Copilot reviewed 53 out of 53 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
EstateManagmentUI.BusinessLogic/RequestHandlers/DateRequestHandler.cs	New request handlers for comparison dates and other entities
EstateManagmentUI.BusinessLogic/Client/DateMethods.cs	API client method for fetching comparison dates
EstateManagmentUI.BusinessLogic/BackendAPI/IEstateReportingApiClient.cs	Backend API client interface and implementation
EstateManagmentUI.BusinessLogic/EstateManagementUI.BusinessLogic.csproj	New business logic project configuration
EstateManagementUI.BlazorServer/Program.cs	Updated DI configuration to use new request handlers
EstateManagementUI.BlazorServer/Components/Pages/Home.razor.cs	Refactored to use new model factory and authentication state
EstateManagementUI.BlazorServer/Factories/ModelFactory.cs	New factory for converting between BusinessLogic and BlazorServer models
Multiple Razor pages	Updated to use ModelFactory for data conversion
Test files	Updated mocks to use SimpleResults Result type

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