PowerSync Nir v2.12.1616-nir.2 — hourly Amber forecast correction

Correct Amber Smart Schedule hourly forecasts using duration-weighted local-hour prices. The existing hourly planner, current-price checks, shared Amber feed and Android/API contracts remain unchanged. Incomplete coverage uses the existing per-channel estimates. Existing DST-fold and final partial-departure-hour planner limitations remain. No Home Assistant deployment or device command was performed.