Fix span panel sensor setup errors

[cayossarian]

Refactor solar sensor generation to prioritize mapped circuit entity IDs, resolving errors from incorrect entity references.

Previously, solar synthetic sensors incorrectly attempted to reference "unmapped" circuit entities, even when solar was connected to "mapped" circuits. This led to errors where backing entities were not found and formulas failed to evaluate. The updated logic now correctly identifies and uses existing "mapped" circuit entities for solar sensor formulas, falling back to "unmapped" entities only if no mapped circuit is found for the specified tabs.

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