Battery UI: drop orphan grid charge headline on fresh installs

[naltatis]

Only show grid charge if feature is available or an old values exists.

Cause: different undefined and null handling.

[sourcery-ai]

Hey - I've left some high level feedback:

• Consider moving the normalization of batteryGridChargeLimit (the new gridChargeLimit computed) closer to where the state is defined or shared (e.g., in the store or a shared helper) so that all consumers get consistent undefined/null handling without each view having to re-implement it.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider moving the normalization of `batteryGridChargeLimit` (the new `gridChargeLimit` computed) closer to where the state is defined or shared (e.g., in the store or a shared helper) so that all consumers get consistent `undefined`/`null` handling without each view having to re-implement it.

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