Enhance audience management features with new components and API integrations

- Added `AssignCoursesModal`, `AudienceMemberRow`, `AudienceTable`, and related components for improved audience management UI.
- Implemented audience invite actions including resend and revoke functionality.
- Updated audience API to support importing members and assigning courses.
- Refactored audience data handling to include status and invite management.
- Improved overall user experience with pagination and selection features in the audience table.

apps/dashboard/src/lib/features/course/components/exercise/submissions/individual.svelte

@@ -81,7 +81,7 @@
         <div class="pb-4">
           <ExerciseQuestion.QuestionRenderer
             contract={{
-              mode: 'view',
+              mode: 'review',
               question: { ...toExerciseQuestionModel(q), title: `${i + 1}. ${q.title}` },
               answer: getStudentAnswerForQuestion($submissions[studentSelected], q),
               labels: questionLabels,