HeatmapStrings
class HeatmapStrings(val legendLess: String, val legendMore: String, val dayDescription: String, val dayDescriptionEmpty: String, val summaryActiveDays: String, val summaryStreak: String)
Strings for the heatmap composables. HeatmapDefaults.strings resolves them from the current locale's resources; callers can override any of them. The day-description templates receive the formatted date, the level, and the max level in that order.