Add milestone creation and editing

ios/Sources/DetailScreens.swift

@@ -154,11 +154,12 @@ final class IssueViewController: MarkdownPageViewController {
         )
         addComment.accessibilityLabel = "Add comment"
         let editIssue = UIBarButtonItem(
-            title: "Edit",
+            image: context.symbol("pencil"),
             style: .plain,
             target: self,
             action: #selector(editIssue)
         )
+        editIssue.accessibilityLabel = "Edit issue"
         navigationItem.rightBarButtonItems = [addComment, editIssue]
         loadContent(refreshing: false)
     }
@@ -884,15 +885,15 @@ private func commentViews(
         var headerViews: [UIView] = [author, UIView()]
         if comment.canEdit, let editComment {
             var configuration = UIButton.Configuration.plain()
-            configuration.title = "Edit"
             configuration.image = UIImage(systemName: "pencil")
-            configuration.imagePadding = 5
             configuration.contentInsets = .zero
             let button = UIButton(
                 configuration: configuration,
                 primaryAction: UIAction { _ in editComment(comment) }
             )
             button.accessibilityLabel = "Edit comment by \(comment.author)"
+            button.widthAnchor.constraint(equalToConstant: 44).isActive = true
+            button.heightAnchor.constraint(equalToConstant: 44).isActive = true
             headerViews.append(button)
         }
         let header = UIStackView(arrangedSubviews: headerViews)