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

docs/CHANGELOG.md

@@ -7,6 +7,47 @@
 ## [Unreleased]
 
 ### Added
+- **Comprehensive Quiz System** - quiz_list_page.dart, teacher_quiz_page.dart, quiz_page.dart
+  - AI-powered quiz generation from uploaded materials
+  - Multiple choice question type implementation
+  - Scoring system with immediate feedback
+  - Progress tracking and results display
+  - Quiz history and retry functionality
+  - Teacher quiz management interface
+  - Student quiz taking interface
+  - Quiz categories by material and class
+  - Integration with gamification service
+
+- **Analytics System** - analytics_page.dart, class_analytics_card.dart, class_ranking_widget.dart
+  - Teacher analytics dashboard with class breakdowns
+  - Student rankings and performance metrics
+  - Class statistics and progress tracking
+  - Achievement system integration
+  - Gamification service implementation
+  - Create achievement dialog for teachers
+
+- **Smart Back Navigation in Chat History** - chat_history_page.dart & tutor_chat_page_simple.dart
+  - Intelligent back navigation based on entry point (chat vs intro)
+  - PopScope for Android back gesture handling
+  - Source parameter (chat/intro) and conversationId in URL
+
+- **Material Names Display in Chat History** - chat_history_page.dart
+  - Replaced raw material IDs with readable file names
+  - Added _materialNamesCache for ID-to-name mappings
+  - Material names truncated to 20 characters if too long
+
+- **Filter Conversations with User Messages Only** - chat_memory_service.dart
+  - Added hasUserMessage field to conversation documents
+  - Prevents empty conversations from appearing in history
+
+- **Dashboard Data Caching** - progress_hero_widget.dart & student_dashboard_page.dart
+  - Caching for user stats to prevent flickering on navigation
+  - Caching for user name to prevent flickering on navigation
+  - Shows cached data while loading new data in background
+
+- **Profile Edit Integration** - profile_edit_page.dart
+  - Calls StudentDashboardPage.clearCachedUserName() when profile is updated
+
 - **Teacher Materials Page (Upload Conteúdo)** - Nova tela dedicada para upload de materiais para a IA
   - Novo ficheiro: `lib/features/materials/presentation/pages/teacher_materials_page.dart`
   - Acedida através do card "Upload Conteúdo" no dashboard do professor (usando `Navigator.push`)