- Add `downloadResponseBody()` helper to all controller export tests for asserting streamed download content (CSV/PDF).
- Update export test endpoints to explicitly include query parameters, e.g., `?search=` for consistency.
- Resolve private `$binary` access via reflection to verify download contents in exports.
- Fix issues with headers (`Content-Disposition` and `Content-Type`) and body assertions.
Signed-off-by: objecttothis <17935339+objecttothis@users.noreply.github.com>