New Xcode Cache transfer, latency, and throughput widgets with combined/split views

The Xcode Cache analytics page now shows four coordinated widgets: Avg. cache hit rate, Cache transfer, Cache latency, and Cache throughput. The new transfer, latency, and throughput widgets each include a dropdown to switch between the combined value and the per-action split (downloads/uploads for transfer, read/write for latency, and downloads/uploads for throughput). Each widget has its own accent color across the legend, dropdown, and chart lines so the four widgets read clearly together instead of appearing as identical purple charts. The chart for each widget now renders the combined series plus the two split series at once.