/**
* Build the editor's top bar (undo/redo/history, zoom group, Image
* menu, Filter menu, Selection-edge menu, Shortcuts, Import, Save).
*
* Pure DOM — no module state, no event listeners. All wiring is done
* by the caller via `document.getElementById(...)` against the IDs
* baked into the markup.
*
* @returns {HTMLDivElement}
*/
export function buildTopbar() {
const topBar = document.createElement('div');
topBar.className = 'ge-topbar';
topBar.innerHTML = `