Implement AXIS parity UI and execution baseline

web/app/source-assets.mjs

@@ -0,0 +1,19 @@
+export const AXIS_ASSET_ROOT = "/linuxcnc/share/axis/images";
+
+export function axisAsset(name) {
+  return `${AXIS_ASSET_ROOT}/${name}`;
+}
+
+export function appendAxisIcon(document, button, asset, label) {
+  const icon = document.createElement("img");
+  icon.className = "axis-icon";
+  icon.src = axisAsset(asset);
+  icon.alt = "";
+  icon.setAttribute("aria-hidden", "true");
+  icon.title = label;
+  const text = document.createElement("span");
+  text.className = "button-copy";
+  text.textContent = label;
+  button.append(icon, text);
+  return button;
+}