Implement requested workflow and UI updates

src/Jiaowu.Api/Controllers/AcademicPlanningController.cs

@@ -446,6 +446,15 @@ public sealed class AcademicPlanningController(
             .Select(x => x.CourseId)
             .Distinct()
             .ToHashSet();
+        var approvedSubstitutions = await db.CourseSubstitutions.AsNoTracking()
+            .Where(x => x.StudentId == student.Id && x.Status == ApprovalStatus.Approved)
+            .Select(x => new { x.OriginalCourseId, x.SubstituteCourseId })
+            .ToListAsync(cancellationToken);
+        foreach (var substitution in approvedSubstitutions)
+        {
+            if (passedCourseIds.Contains(substitution.SubstituteCourseId))
+                passedCourseIds.Add(substitution.OriginalCourseId);
+        }
         var failedCourseIds = gradeAttempts
             .GroupBy(x => x.CourseId)
             .Where(group => !group.Any(x =>