fix: add missing state_class to Jupiter and B2500 V2 sensors

[tomquist]

Completes the state_class additions from #311 for the remaining devices:

• Jupiter: BMS capacity (energy_storage) and charge voltage (voltage) were missing state_class: measurement.
• B2500 V2: solar input voltage/current, output voltage/current and host/extra battery voltage/current sensors were missing state_class: measurement.

Without state_class, Home Assistant does not record long-term statistics for these sensors and the State of Charge sensors cannot be added to the Energy Dashboard battery configuration introduced in HA 2026.6.

fixes #310

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Reviewing files that changed from the base of the PR and between c1a4577 and 806a94f.

📒 Files selected for processing (3)

• CHANGELOG.md
• src/device/b2500V2.ts
• src/device/jupiter.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/awesome-meitner-rgMkk

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[michikrug]

Thanks for the quick merge and sorry for my dumb claude missing those ^^ :D