Keep enrolled single-class card at normal width.

Use a fixed card width when only one enrolled class is present so the card keeps the intended compact design instead of stretching across the content area.

Made-with: Cursor

classroom_app/ViewController.swift

@@ -360,6 +360,7 @@ final class ViewController: NSViewController {
     private weak var schedulePageCardsScrollView: NSScrollView?
     private weak var enrolledPageHeadingLabel: NSTextField?
     private weak var enrolledPageCardsStack: NSStackView?
+    private let enrolledSingleCardWidth: CGFloat = 320
 
     // MARK: - Calendar page (custom month UI)
     private var calendarPageMonthAnchor: Date = Calendar.current.startOfDay(for: Date())
@@ -6118,10 +6119,16 @@ private extension ViewController {
             return
         }
 
+        let isSingleCard = (courses.count == 1)
         for course in courses {
             let card = enrolledClassCard(course: course)
             stack.addArrangedSubview(card)
-            card.widthAnchor.constraint(equalTo: stack.widthAnchor).isActive = true
+            if isSingleCard {
+                card.widthAnchor.constraint(equalToConstant: enrolledSingleCardWidth).isActive = true
+                card.widthAnchor.constraint(lessThanOrEqualTo: stack.widthAnchor).isActive = true
+            } else {
+                card.widthAnchor.constraint(equalTo: stack.widthAnchor).isActive = true
+            }
         }
     }