Melhoria no funcionamento do histórico, Os nomes no dashboard do aluno carregam a primeira vez e ficam salvos para n ficarem sempre a carregar quando se volta ao dashboard, removi o butão de novo chat na interface de introdução da IA, mudei a aparencia dessa introdução e do histórico

lib/core/services/chat_memory_service.dart

@@ -39,6 +39,7 @@ class ChatMemoryService {
           'updatedAt': FieldValue.serverTimestamp(),
           'selectedMaterialIds': selectedMaterialIds,
           'messageCount': 0,
+          'hasUserMessage': false,
         });
 
     _currentConversationId = conversationRef.id;
@@ -98,19 +99,24 @@ class ChatMemoryService {
           .orderBy('updatedAt', descending: true)
           .get();
 
-      final conversations = snapshot.docs.map((doc) {
-        final data = doc.data();
-        return {
-          'id': doc.id,
-          'title': data['title'] as String? ?? 'Sem título',
-          'createdAt': data['createdAt'] as Timestamp?,
-          'updatedAt': data['updatedAt'] as Timestamp?,
-          'selectedMaterialIds':
-              (data['selectedMaterialIds'] as List<dynamic>?)?.cast<String>() ??
-              [],
-          'messageCount': data['messageCount'] as int? ?? 0,
-        };
-      }).toList();
+      final conversations = snapshot.docs
+          .map((doc) {
+            final data = doc.data();
+            return {
+              'id': doc.id,
+              'title': data['title'] as String? ?? 'Sem título',
+              'createdAt': data['createdAt'] as Timestamp?,
+              'updatedAt': data['updatedAt'] as Timestamp?,
+              'selectedMaterialIds':
+                  (data['selectedMaterialIds'] as List<dynamic>?)
+                      ?.cast<String>() ??
+                  [],
+              'messageCount': data['messageCount'] as int? ?? 0,
+              'hasUserMessage': data['hasUserMessage'] as bool? ?? false,
+            };
+          })
+          .where((conv) => (conv['hasUserMessage'] as bool) == true)
+          .toList();
 
       Logger.info('Retrieved ${conversations.length} conversations');
       return conversations;
@@ -193,15 +199,22 @@ class ChatMemoryService {
           .add(messageData);
 
       // Update conversation metadata
+      final updateData = <String, dynamic>{
+        'updatedAt': FieldValue.serverTimestamp(),
+        'messageCount': FieldValue.increment(1),
+      };
+
+      // Set hasUserMessage to true if this is a user message
+      if (role == 'user') {
+        updateData['hasUserMessage'] = true;
+      }
+
       await _firestore
           .collection('userChats')
           .doc(user.uid)
           .collection('conversations')
           .doc(convId)
-          .update({
-            'updatedAt': FieldValue.serverTimestamp(),
-            'messageCount': FieldValue.increment(1),
-          });
+          .update(updateData);
 
       Logger.info(
         'Message saved to Firestore: role=$role, conversation=$convId',
@@ -281,6 +294,7 @@ class ChatMemoryService {
             (data?['selectedMaterialIds'] as List<dynamic>?)?.cast<String>() ??
             [],
         'messageCount': data?['messageCount'] as int? ?? 0,
+        'hasUserMessage': data?['hasUserMessage'] as bool? ?? false,
       };
     } catch (e) {
       Logger.error('Error getting conversation: $e');