fix: scope page insights to reporting periods

internal/insight/builder_transaction_test.go

@@ -8,6 +8,7 @@ import (
 func TestDeterministicTransactionCopyDistinguishesPaymentStatesWithoutCausalClaims(t *testing.T) {
 	copy := deterministicTransactionCopy(
 		PeriodScope{JalaliLabelFA: "مرداد ۱۴۰۵"},
+		"تیر ۱۴۰۵",
 		aggregate{Sessions: 10, Paid: 7, Verified: 5, Unverified: 2, Failed: 2, Reversed: 1},
 		aggregate{Sessions: 8, Paid: 6},
 		true,
@@ -29,6 +30,7 @@ func TestDeterministicTransactionCopyDistinguishesPaymentStatesWithoutCausalClai
 func TestDeterministicTransactionCopyHandlesEmptyPeriod(t *testing.T) {
 	copy := deterministicTransactionCopy(
 		PeriodScope{JalaliLabelFA: "امروز"},
+		"دیروز",
 		aggregate{},
 		aggregate{},
 		false,
@@ -43,3 +45,23 @@ func TestDeterministicTransactionCopyHandlesEmptyPeriod(t *testing.T) {
 		t.Fatalf("expected unavailable rates in empty-period copy: %s", copy.LatestObserved.Body)
 	}
 }
+
+func TestDeterministicPeriodCopyUsesSelectedPeriodForOverview(t *testing.T) {
+	copy := deterministicPeriodCopy(
+		ModuleOverview,
+		PeriodScope{JalaliLabelFA: "مرداد ۱۴۰۵"},
+		"تیر ۱۴۰۵",
+		aggregate{Sessions: 10, Paid: 7},
+		aggregate{Sessions: 8, Paid: 6},
+		true,
+		TimeContext{},
+		ConfidenceHigh,
+	)
+
+	if !strings.Contains(copy.LatestObserved.Body, "مرداد ۱۴۰۵") {
+		t.Fatalf("selected period missing from summary: %s", copy.LatestObserved.Body)
+	}
+	if !strings.Contains(copy.Past.Body, "تیر ۱۴۰۵") {
+		t.Fatalf("exact preceding period missing from comparison: %s", copy.Past.Body)
+	}
+}