fix(iframe): scale iframe content with the board (#7034)

packages/widgets/src/iframe/component.module.css

@@ -1,7 +1,13 @@
-.iframe {
+.frame {
+  position: relative;
+  overflow: hidden;
   border-radius: var(--mantine-radius-sm);
+}
+
+.iframe {
   width: 100%;
   height: 100%;
+  zoom: var(--board-canvas-ui-scale, 1);
   border: none;
   background: none;
   background-color: transparent;