           <div class="history-controls">
                        <button id="undo-btn" class="btn btn-icon" title="Undo (Ctrl+Z)" disabled>
                            <span class="material-icons">undo</span>
                        </button>
                        <button id="redo-btn" class="btn btn-icon" title="Redo (Ctrl+Y)" disabled>
                            <span class="material-icons">redo</span>
                        </button>
                    </div>
                    <button id="save-co