fix: select name for editing when creating new files or folders

Fixes #2029

When creating a new file or folder via the context menu, the name is now
automatically selected for editing. This matches the expected macOS UX
behavior where new items can be immediately renamed.

Changes:
- Added renameFile() call after creating new file in newFile()
- Added renameFile() call after creating new folder in newFolder()

Note: The newFileFromClipboard() already had this behavior, this makes
the other creation methods consistent.

Author: William-Laverty

CodeEdit/Features/NavigatorArea/ProjectNavigator/OutlineView/ProjectNavigatorMenuActions.swift

@@ -90,6 +90,7 @@ extension ProjectNavigatorMenu {
             if let newFile = try workspace?.workspaceFileManager?.addFile(fileName: "untitled", toFile: item) {
                 workspace?.listenerModel.highlightedFileItem = newFile
                 workspace?.editorManager?.openTab(item: newFile)
+                renameFile()
             }
         } catch {
             let alert = NSAlert(error: error)
@@ -147,6 +148,7 @@ extension ProjectNavigatorMenu {
         do {
             if let newFolder = try workspace?.workspaceFileManager?.addFolder(folderName: "untitled", toFile: item) {
                 workspace?.listenerModel.highlightedFileItem = newFolder
+                renameFile()
             }
         } catch {
             let alert = NSAlert(error: error)