fix: show received certifications when asked, and keep only latests

lib/models/queries_indexer.dart

@@ -85,7 +85,7 @@ query ($address: String!, $number: Int!, $offset: Int!) {
 
 const String getCertsReceived = r'''
 query ($address: String!) {
-  certification(where: {receiver: {pubkey: {_eq: $address}}}) {
+  certification(where: {receiver: {pubkey: {_eq: $address}}}, order_by: {created_at: desc}) {
     issuer {
       pubkey
       name
@@ -97,7 +97,7 @@ query ($address: String!) {
 
 const String getCertsSent = r'''
 query ($address: String!) {
-  certification(where: {issuer: {pubkey: {_eq: $address}}}) {
+  certification(where: {issuer: {pubkey: {_eq: $address}}}, order_by: {created_at: desc}) {
     receiver {
       pubkey
       name

lib/screens/certifications.dart

@@ -51,7 +51,7 @@ class CertificationsScreen extends StatelessWidget {
                     CertsCounter(address: address)
                   ]),
                   content: CertsList(
-                      address: address, direction: CertDirection.sent),
+                      address: address, direction: CertDirection.received),
                   contentHorizontalPadding: 0,
                   contentBorderWidth: 1,
                 ),

lib/widgets/certs_list.dart

@@ -87,11 +87,15 @@ class CertsList extends StatelessWidget {
             final date = DateTime.parse(cert['created_at']);
             final dp = DateTime(date.year, date.month, date.day);
             final dateForm = '${dp.day}-${dp.month}-${dp.year}';
-            listCerts.add({
-              'address': issuerAddress,
-              'name': issuerName,
-              'date': dateForm
-            });
+
+            // Check if we have a more recent certification, we skip
+            if (!listCerts.any((cert) => cert['address'] == issuerAddress)) {
+              listCerts.add({
+                'address': issuerAddress,
+                'name': issuerName,
+                'date': dateForm
+              });
+            }
           }
 
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