v0.3.0b2

The second candidate for 0.3.0, with what the first one's testers
reported: Phases in use now follows the phases actually switched to
the car, and the power per source reads 0 W instead of unknown. Requires
Home Assistant 2026.9.0 or newer. Entity IDs stay the same.

Changed

• Phases in use now counts the phases switched through to the car
  (pha) instead of reading the charger's phase count (pnp). That count
  stayed at 1 through whole three-phase sessions, on a Wattpilot Home and on
  a Flex, and followed a switch about 30 seconds late. The sensor now reads
  0 when no phase is switched, where it showed 1 or 3 before; check
  automations that test it for 1. The entity ID stays the same.
• Charging power from solar, battery, grid and other sources
  read 0 W for a source that contributes nothing. A Flex sent no number for
  solar and battery in that case, so they showed unknown and the four could
  not be added up. Their unit is now confirmed as watts: while charging they
  add up to Charging power.
• A reconnect reuses the password hash of the previous connection instead
  of computing it again, so the charger gets its answer sooner: about a
  tenth of a second per reconnect on a Wattpilot Home, whose password hash
  is the slow one.