Planning algorithm tweaks including PV90 support (when enabled), Misc fixes

What's Changed

Improvements to planning

When enabled with switch.predbat_calculate_pv90_plan Predbat will use the PV90 scenario (as well as the PV10) within its planning algorithm, this does take 20-30% more compute but will more correctly hedge scenarios for better solar/lower load days.

The battery value algorithm has also been changed for those with low/zero export rates to discourage over charging.

Please feedback

• feat(plan): add a pv90 upside forecast scenario to balance the one-sided pv10 hedge by @springfall2008 in #4462
• fix(plan): convert phantom export windows to freeze in clip_export_slots (#4453) by @springfall2008 in #4487
• fix(plan): value left-over battery on the base tariff, not saving-session prices by @springfall2008 in #4488

Bug fixes and documentation updates

• docs(ohme): energy sensor removed in HA 2026.8.0, recommend a Riemann sum helper by @chalfontchubby in #4465
• fix(prediction): bound import/export kWh to end_record, not the full forecast horizon by @springfall2008 in #4470
• feat: mirror gateway_status.proto wifi_ssid field (predbat-gateway sync) by @mgazza in #4467
• feat(plan): show a rate range for merged plan cells, fix threshold wording by @chalfontchubby in #4362
• fix(fetch): warn loudly when car_charging_energy is configured but has no data by @chalfontchubby in #4469
• Update LuxPower template by @brickatius in #4475
• fix(sigenergy): exit VPP explicitly before offboarding, and confirm it landed by @mgazza in #4477
• fix(web): stop double-marking manually overridden plan rate cells by @chalfontchubby in #4479
• fix(load): stop zeroing genuine load when import exceeds it for a bucket by @chalfontchubby in #4471
• fix(inverter): only invoke discharge_freeze_service on an explicit freeze request by @chalfontchubby in #4472
• Remove battery device_class from Fox SOH sensor to prevent HA low-battery false alerts by @springfall2008 with @Copilot in #4490

Full Changelog: v8.47.7...v8.48.0