- Added methods in `SalesforceCaseService` to fetch and add case messages, unifying email messages and case comments into a chronological conversation thread.
- Enhanced `SupportService` and `SupportController` to handle case message retrieval and comment addition, integrating new DTOs for request and response validation.
- Updated `SupportCaseDetailView` in the Portal to display conversation messages and allow users to add comments, improving user interaction with support cases.
- Introduced new schemas in the domain for case messages and comments, ensuring robust validation and type safety.
- Refactored Salesforce mappers to transform email messages and case comments into a unified format for display in the portal.