Added a field performance report panel

I added a Field Diagnostics panel to make field slowdowns easier to investigate. It shows recent frame gaps, peak delay, samples above 50 milliseconds and the named CPU work that took time. Streaming queues and save status sit beside those readings.

The panel deliberately says that GPU time is not measured. CPU sections are inclusive measurements and can overlap, so the numbers should help locate work rather than be added together as a frame budget. REPORT exports the collected data; HIDE dismisses the panel, and clicking the FPS readout brings it back.

“A compact panel tracks frame gaps, streaming, save activity and recent expensive operations.”

The clips inspect the live native panel in an isolated field session, before and after its controls are exercised. They are a demonstration of the diagnostic interface, not a before-and-after performance benchmark.