macOS: command pallete scroll improvements

Removes the withAnimation closure which caused flashing when scrolling
up or down with arrow keys. Also removes the center anchor to behave
more like other command palletes (e.g., Zed, Raycast).

macos/Sources/Features/Command Palette/CommandPalette.swift

@@ -177,11 +177,8 @@ fileprivate struct CommandTable: View {
                 .frame(maxHeight: 200)
                 .onChange(of: selectedIndex) { _ in
                     guard selectedIndex < options.count else { return }
-                    withAnimation {
-                        proxy.scrollTo(
-                            options[Int(selectedIndex)].id,
-                            anchor: .center)
-                    }
+                    proxy.scrollTo(
+                        options[Int(selectedIndex)].id)
                 }
             }
         }