LCFS - Document generation - CI application approval letter

**Describe the task**
Replace the approval letter workflow with an approval summary section within the final approved/completed CI application. Approved applications should display the approved language directly in the portal and allow users to download a PDF version if required.

**Purpose**
The approval process is now being completed entirely within the portal. Rather than generating and delivering separate approval letters, the approved language should become part of the completed application record. This provides a single source of truth, simplifies the workflow, and allows users to download a PDF copy when needed.

**Acceptance Criteria**
- [ ] A completed and approved CI application displays the approved language within the application record.
- [ ] The approved language is visible to authorized users viewing the completed application.
- [ ] Users can download a PDF version of the completed application that includes the approved language.
- [ ] The PDF output matches the approved content displayed in the portal.
- [ ] Existing application notifications continue to be used and no separate approval letter notification process is introduced.
- [ ] The approved application content is retained as part of the application's audit and recordkeeping history.
- [ ] Access to approved application content follows existing role-based permissions.

**Additional context**
- Approval letters are no longer planned as a separate workflow.
- Notifications are already being implemented through the portal and should continue to be used.
- The business area will provide the approved template language for inclusion in the completed application.
- The final approved/completed application should serve as the system of record for approval communication.
- The PDF download should be generated from the approved application record rather than a separate approval letter document.