fix: anchor growth forecasts to real Tehran date

internal/growthreport/time.go

@@ -2,6 +2,15 @@ package growthreport
 
 import "time"
 
+func tehranToday(now time.Time) time.Time {
+	location, err := time.LoadLocation("Asia/Tehran")
+	if err != nil {
+		location = time.FixedZone("Asia/Tehran", 12600)
+	}
+	local := now.In(location)
+	return time.Date(local.Year(), local.Month(), local.Day(), 0, 0, 0, 0, location)
+}
+
 func NextTehranRefresh(now time.Time) time.Time {
 	location, err := time.LoadLocation("Asia/Tehran")
 	if err != nil {