fix(graph): always show edge filter/transform label

Drop the selected-only gate so the filter subject → transform destination
hint is visible on every edge, not just the focused one.

frontend/src/components/graph/RouteEdge.tsx

@@ -5,18 +5,17 @@ type RouteEdgeData = { filterSubject?: string; transformDest?: string };
 export default function RouteEdge(props: EdgeProps) {
   const {
     id, sourceX, sourceY, targetX, targetY, sourcePosition, targetPosition,
-    selected, markerEnd, style, data,
+    markerEnd, style, data,
   } = props;
   const [edgePath, labelX, labelY] = getSmoothStepPath({
     sourceX, sourceY, targetX, targetY, sourcePosition, targetPosition,
   });
   const d = (data ?? {}) as RouteEdgeData;
-  const showLabel = Boolean(selected);
 
   return (
     <>
       <BaseEdge id={id} path={edgePath} markerEnd={markerEnd} style={style} />
-      {showLabel && (d.filterSubject || d.transformDest) && (
+      {(d.filterSubject || d.transformDest) && (
         <EdgeLabelRenderer>
           <div
             style={{