Battery Hold Charge: ui state; api docs

[naltatis]

api docs and ui communication for new hold charge state introduced in #27906

[sourcery-ai]

Hey - I've left some high level feedback:

• The new batteryChargeHold state and passing it as hold in iconProps makes the meaning of the hold flag ambiguous (discharge vs. charge hold); consider renaming the prop or wiring both batteryHold and batteryChargeHold explicitly to better reflect their semantics in the icon component.
• Both batteryChargeLabel and batteryDischargeLabel now build translation keys with string interpolation (battery...ChargeHold / DischargeHold); consider centralizing this mapping in a small helper or enum-to-key function to reduce duplication and avoid subtle key mismatches as more modes are added.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The new `batteryChargeHold` state and passing it as `hold` in `iconProps` makes the meaning of the `hold` flag ambiguous (discharge vs. charge hold); consider renaming the prop or wiring both `batteryHold` and `batteryChargeHold` explicitly to better reflect their semantics in the icon component.
- Both `batteryChargeLabel` and `batteryDischargeLabel` now build translation keys with string interpolation (`battery...ChargeHold` / `DischargeHold`); consider centralizing this mapping in a small helper or enum-to-key function to reduce duplication and avoid subtle key mismatches as more modes are added.

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