fix(core): wrap marker urls with quotes

Author: bcakmakoglu

packages/core/src/components/Edges/EdgeWrapper.ts

@@ -195,8 +195,8 @@ const EdgeWrapper = defineComponent({
                 data: edge.value.data,
                 events: { ...edge.value.events, ...hooks.on },
                 style: edgeStyle.value,
-                markerStart: `url(#${getMarkerId(edge.value.markerStart, vueFlowId)})`,
-                markerEnd: `url(#${getMarkerId(edge.value.markerEnd, vueFlowId)})`,
+                markerStart: `url('#${getMarkerId(edge.value.markerStart, vueFlowId)}')`,
+                markerEnd: `url('#${getMarkerId(edge.value.markerEnd, vueFlowId)}')`,
                 sourcePosition,
                 targetPosition,
                 sourceX,