Updated `MailingsController` to include endpoints for retrieving mailing statistics by status and ID. Modified `IMailingRepository` and `IMailingService` to support new methods for fetching statistics and canceling mailings. Introduced `MailingStatistic` class and corresponding Dapper mappings.
In the React frontend, added `ActiveMailings` and `CompletedMailings` components to display statistics, along with a `ConfirmationDialog` for canceling mailings. Updated authentication management in `AuthCheck` and `AuthContext`. Created `mailingStatistic.ts` for TypeScript interface definition.
David Headrick
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