Fix enrolled cards alignment in page layout.

Anchor enrolled cards to the content column by using leading stack alignment and explicit width constraints so class cards render under the heading instead of drifting to the right.

Made-with: Cursor

classroom_app/ViewController.swift

@@ -2279,7 +2279,7 @@ private extension ViewController {
         stack.userInterfaceLayoutDirection = .leftToRight
         stack.orientation = .vertical
         stack.spacing = 14
-        stack.alignment = .width
+        stack.alignment = .leading
         enrolledPageCardsStack = stack
         scroll.documentView = stack
 
@@ -6114,11 +6114,14 @@ private extension ViewController {
                 emptyLabel.centerYAnchor.constraint(equalTo: empty.centerYAnchor)
             ])
             stack.addArrangedSubview(empty)
+            empty.widthAnchor.constraint(equalTo: stack.widthAnchor).isActive = true
             return
         }
 
         for course in courses {
-            stack.addArrangedSubview(enrolledClassCard(course: course))
+            let card = enrolledClassCard(course: course)
+            stack.addArrangedSubview(card)
+            card.widthAnchor.constraint(equalTo: stack.widthAnchor).isActive = true
         }
     }