Share the live Analytics count heatmap and readable long durations

Discovery Analytics needs the approved tool-call heatmap to stay readable and usable with more than 100 agents. Add a shared CountHeatmap in the optional React entrypoint, preserving zero, unknown and partial counts, separate failure marks, responsive column grouping, keyboard selection and virtualized rows. The app removes its private matrix and composes this component.

Run ID: run_d0299f7ed67c58fd7c3270abc72f522d