## Summary
- configure the screenshot pipeline's Discussion fixture with a valid
selected category
- provide category discovery in the fake client so Feedback and Help
exercise screenshot upload/embedding instead of returning an
availability error
## Test plan
- `CI=true pnpm --filter @fusion/dashboard exec vitest run
src/__tests__/report-pipeline-screenshots.test.ts`
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Tests**
* Updated dashboard report-pipeline screenshot test coverage to support
general discussion categories.
* Enhanced the test environment to provide a mocked general discussion
category.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
cb1acc1590