- Add template sensor 'Eksport do sieci' (W, positive when exporting to grid)
- Add template sensor 'Pobór z sieci' (W, positive when importing from grid)
  Both derived from sensor.inverter_deye_grid_power (negative=export, positive=import)

- Redesign deye_dashboard.yaml:
  - Add 'Energia teraz' card: PV, zużycie, eksport, pobór, bateria, tryb
  - Add 'Energia dziś' card: daily totals from Deye counters
  - Show programs 4 and 5 (previously missing)
  - Add history graph: PV + eksport + pobór

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