Fix Drafts button never turning into Post on Mac Catalyst

Closes #504

Packages/ComposeUI/Sources/ComposeUI/Controllers/ComposeController.swift

@@ -333,7 +333,12 @@ public final class ComposeController: ViewController {
             }
             .toolbar {
                 ToolbarItem(placement: .cancellationAction) { cancelButton }
+                #if targetEnvironment(macCatalyst)
+                ToolbarItem(placement: .topBarTrailing) { draftsButton }
                 ToolbarItem(placement: .confirmationAction) { postButton }
+                #else
+                ToolbarItem(placement: .confirmationAction) { postOrDraftsButton }
+                #endif
                 #if os(visionOS)
                 ToolbarItem(placement: .bottomOrnament) {
                     ControllerView(controller: { controller.toolbarController })
@@ -461,18 +466,26 @@ public final class ComposeController: ViewController {
         }
         
         @ViewBuilder
-        private var postButton: some View {
+        private var postOrDraftsButton: some View {
             if draft.hasContent || draft.editedStatusID != nil || !controller.config.allowSwitchingDrafts {
+                postButton
+            } else {
+                draftsButton
+            }
+        }
+        
+        private var draftsButton: some View {
+            Button(action: controller.showDrafts) {
+                Text("Drafts")
+            }
+        }
+        
+        private var postButton: some View {
             Button(action: controller.postStatus) {
                 Text(draft.editedStatusID == nil ? "Post" : "Edit")
             }
             .keyboardShortcut(.return, modifiers: .command)
             .disabled(!controller.postButtonEnabled)
-            } else {
-                Button(action: controller.showDrafts) {
-                    Text("Drafts")
-                }
-            }
         }
         
         #if !os(visionOS)