Remove overflow menu from enrolled/teaching popup stream cards.

The shared stream meta row now omits the three-dot label so announcement and coursework cards match the requested UI.

Made-with: Cursor

classroom_app/ViewController.swift

@@ -5263,11 +5263,7 @@ private final class EnrolledClassDetailsViewController: NSViewController {
         nameTime.alignment = .leading
         nameTime.spacing = 2
 
-        let menu = NSTextField(labelWithString: "⋮")
-        menu.font = NSFont.systemFont(ofSize: 18, weight: .semibold)
-        menu.textColor = palette.textMuted
-
-        let row = NSStackView(views: [avatar, nameTime, NSView(), menu])
+        let row = NSStackView(views: [avatar, nameTime, NSView()])
         row.orientation = .horizontal
         row.alignment = .top
         row.distribution = .fill