resetForNewController

Wipes every process-wide static this companion object holds and bumps mapSessionId, so a freshly created MapController starts from a clean slate instead of inheriting stale per-source state (timelines, valid-time lists, download counters) from a previous controller instance. Call from MapController's constructor.

Required because much of MapsGL's per-source render/animation state lives here in the companion (e.g. sourceTimeHash, validTimesList, timeStrings); when a second MapController is created (typically in a new activity) with the same source IDs as the previous one — temperature is the classic example — the stale entries make the renderer think tiles for those time intervals are already downloaded and bound, while the actual GPU data and per-source LayerTimeline reference the previous controller. The new layer then renders nothing for the visible phase strings. Safe at process start because everything is already in its initial state.