Build flashsharp flashcard app

src/Flashsharp/Pages/Courses/Details.cshtml.cs

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+using Flashsharp.Auth;
+using Flashsharp.Data;
+using Flashsharp.Domain;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+
+namespace Flashsharp.Pages.Courses;
+
+public sealed class DetailsModel(Store store) : PageModel
+{
+    public CourseSummary Course { get; private set; } = null!;
+
+    public IReadOnlyList<LessonSummary> Lessons { get; private set; } = [];
+
+    public async Task<IActionResult> OnGetAsync(long id, CancellationToken cancellationToken)
+    {
+        var userId = User.GetUserId();
+        var course = await store.GetCourseAsync(id, userId, cancellationToken);
+        if (course is null)
+        {
+            return NotFound();
+        }
+
+        Course = course;
+        Lessons = await store.ListLessonsAsync(id, userId, cancellationToken);
+        return Page();
+    }
+}