Bug: '15:00 wyłącz ładowanie' automation had condition grid_charging=ON.
When PV was sufficient (Battery First, no grid import), that condition was
never met → max_charging_current stayed at limited value indefinitely.
Next morning, battery charged slowly from PV and excess went to grid.

Fix: Remove grid_charging condition from 15:00 trigger. Always restore
battery_max_charging_current=100A at end of cheap window, regardless of
whether grid charging was used.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>