fix: scope page insights to reporting periods

internal/analytics/periods_test.go

@@ -94,3 +94,29 @@ func TestCompletePeriods(t *testing.T) {
 		t.Fatalf("completePeriods() returned %d defaults, want 1", defaultCount)
 	}
 }
+
+func TestPrecedingPeriodLabelUsesExactJalaliPeriod(t *testing.T) {
+	location, err := time.LoadLocation("Asia/Tehran")
+	if err != nil {
+		t.Fatal(err)
+	}
+	tests := []struct {
+		name       string
+		periodType string
+		start      time.Time
+		want       string
+	}{
+		{name: "day", periodType: "DAY", start: time.Date(2026, 7, 23, 0, 0, 0, 0, location), want: "روز ۳۱ تیر ۱۴۰۵"},
+		{name: "week", periodType: "WEEK", start: time.Date(2026, 8, 15, 0, 0, 0, 0, location), want: "هفته ۱۷ مرداد تا ۲۳ مرداد ۱۴۰۵"},
+		{name: "month", periodType: "JALALI_MONTH", start: time.Date(2026, 7, 23, 0, 0, 0, 0, location), want: "تیر ۱۴۰۵"},
+		{name: "season", periodType: "PERSIAN_SEASON", start: time.Date(2026, 6, 22, 0, 0, 0, 0, location), want: "بهار ۱۴۰۵"},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, ok := PrecedingPeriodLabel(tt.periodType, tt.start)
+			if !ok || got != tt.want {
+				t.Fatalf("PrecedingPeriodLabel() = %q, %v; want %q, true", got, ok, tt.want)
+			}
+		})
+	}
+}