- Implemented `ppt-management-briefing-edit.showcase.test.ts` to test editing PPTs with AI assistance.
- Created `ppt-management-briefing-review.showcase.test.ts` for reviewing PPTs generated by AI.
- Added `xinghe-kb-reply.showcase.test.ts` to validate knowledge base replies against local documents.
- Developed `xinghe-service-contract.showcase.test.ts` to test AI responses based on PDF contract queries.
- Introduced shared utility functions in `shared.ts` for handling file operations and cost calculations.
- Updated Vitest configuration to include new test paths for showcase cases.