Function default

Renders the contents of the Session Detail page's Overview tab. Composition:

1. MetricGrid — eight-cell summary tiles.
2. SpeedRpmChart — dual-axis centerpiece with brush.
3. 2-column grid of supporting charts: Throttle/Load, AFR, Boost, Engine Vitals, Power & Torque.
4. MiniMap — compact GPS route preview.

Every chart receives the shared OVERVIEW_SYNC_ID so the hover cursor moves in lockstep across the entire tab.