chore: extract ToolbarButton component

src/components/controls/atoms/ToolbarButton.js

@@ -0,0 +1,12 @@
+export function ToolbarButton({ isActive, iconKey, onClick, label }) {
+  return (
+    <div
+      className={isActive ? "toolbar-tab active" : "toolbar-tab"}
+      key={iconKey}
+      onClick={onClick}
+    >
+      <i className="material-icons">{iconKey}</i>
+      <div className="tab-caption">{label}</div>
+    </div>
+  );
+}