Clean up and normalize prompt output modules

internal/briefing/summary_helpers.go

@@ -7,6 +7,7 @@ import (
 	"strings"
 
 	"gitea.maximumdirect.net/eric/weatherreporter/internal/forecast"
+	"gitea.maximumdirect.net/eric/weatherreporter/internal/timeutil"
 )
 
 type OutdoorWindows struct {
@@ -16,8 +17,7 @@ type OutdoorWindows struct {
 
 type OutdoorWindow struct {
 	Daypart string
-	Start   string
-	End     string
+	Period  timeutil.Period
 	Reasons []string
 	Score   float64
 }
@@ -190,8 +190,7 @@ func scoreOutdoorWindow(daypart forecast.DaypartSummary) OutdoorWindow {
 	}
 	return OutdoorWindow{
 		Daypart: daypart.Name,
-		Start:   daypart.Period.Start.Format("15:04"),
-		End:     daypart.Period.End.Format("15:04"),
+		Period:  daypart.Period,
 		Reasons: dedupe(reasons),
 		Score:   math.Round(score*10) / 10,
 	}