tela de verificação de turma, possibilidade de alunos entrarem em turmas

docs/CHANGELOG.md

@@ -7,6 +7,43 @@
 ## [Unreleased]
 
 ### Added
+- **Student Classes List (ETAPA 5)** - Students can now view their enrolled classes on the home page
+  - New `StudentClassesListWidget` at `/lib/features/dashboard/presentation/widgets/student_classes_list_widget.dart`
+  - Query: `.collection('enrollments').where('studentId', isEqualTo: currentUser.uid).orderBy('joinedAt', descending: true)`
+  - For each enrollment, fetches corresponding class document from `classes` collection using `classId`
+  - Layout: Same horizontal 2-row scroll pattern as `TeacherClassesListWidget`
+  - Cards display: Class name + Class code
+  - Loading state: `CircularProgressIndicator` (centered in card while loading class data)
+  - Empty state: Text "Ainda não entraste em nenhuma turma."
+  - Widget inserted in `StudentDashboardPage` after QuickAccessWidget
+  - Visual design: White cards (#FFFFFF), teal icon background (#82C9BD with 10% opacity), rounded corners (16px), subtle shadows
+  - Title: "As Minhas Turmas" (same style as teacher dashboard)
+  - System now bidirectional: Teachers see students, Students see classes
+
+- **Join Class Feature (ETAPA 4)** - Students can now join classes using class codes
+  - New `JoinClassPage` screen at `/lib/features/classes/presentation/pages/join_class_page.dart`
+  - TextField for entering 6-character class code (uppercase, centered, letter-spacing)
+  - "Entrar na Turma" button with loading state and visual feedback
+  - Firestore query: `.collection('classes').where('code', isEqualTo: enteredCode).limit(1)`
+  - Validation: checks if code exists, if student already enrolled
+  - On success: creates document in `enrollments` collection with `classId`, `studentId`, `studentName`, `joinedAt`
+  - Success feedback: green SnackBar "Entraste na turma com sucesso!"
+  - Error feedback: red SnackBar for invalid code, duplicate enrollment, or auth errors
+  - Auto-returns to student home after successful join
+  - Visual design: teal AppBar (#82C9BD), centered icon, clean input field with rounded corners
+  - New "Entrar numa Turma" card in Student Dashboard Quick Access section
+  - Card design: horizontal layout with `Icons.group_add`, white background, rounded corners
+
+- **Class Students View (ETAPA 3)** - Teachers can now view enrolled students in each class
+  - New `ClassStudentsPage` screen at `/lib/features/classes/presentation/pages/class_students_page.dart`
+  - StreamBuilder query on `enrollments` collection with filter by `classId`
+  - ListTile layout showing student name and join date
+  - Loading state with `CircularProgressIndicator`
+  - Empty state message when no students enrolled
+  - Date formatting using `intl` package (dd/MM/yyyy format)
+  - Consistent styling with existing app design (teal colors, rounded cards)
+  - Navigation via `MaterialPageRoute` from class card tap
+
 - **Class Creation Feature (ETAPA 1)** - Teachers can now create classes from the dashboard
   - New "Criar Turma" button in Teacher Dashboard Quick Actions
   - Simple dialog interface for entering class name