feat(app): virtualize relationship items

flowsint-app/src/components/graphs/details-panel/relationships.tsx

@@ -5,8 +5,11 @@ import { Badge } from '@/components/ui/badge'
 import { useGraphStore } from '@/stores/graph-store'
 import { useQuery } from '@tanstack/react-query'
 import { ArrowRight } from 'lucide-react'
-import { memo, useCallback } from 'react'
+import { memo, useCallback, useRef } from 'react'
 import { GraphEdge, GraphNode } from '@/types'
+import { useVirtualizer } from '@tanstack/react-virtual'
+
+const ITEM_HEIGHT = 36 // 32px badge height + 4px gap
 
 type Relation = {
   source: GraphNode
@@ -34,32 +37,92 @@ const Relationships = memo(
 
     const relationships = getInlineRelationships(neighborsData?.nds || [], neighborsData?.rls || [])
 
-    if (isLoading)
+    if (isLoading) {
       return (
-        <div className="flex items-center justify-center grow h-full">
+        <div className="flex items-center justify-center h-full">
           <Loader />
         </div>
       )
+    }
 
-    return (
-      <div className="h-full overflow-auto py-3 px-3 space-y-1">
-        {relationships.map((rel, index) => (
-          <Badge key={index} variant={'outline'} className="h-8 px-2 py-1 w-full">
-            <div className="flex items-center gap-1 w-full min-w-0 h-full">
-              <div className="min-w-0 flex-1 flex items-center">
-                <RelationshipItem node={rel.source} />
+    if (relationships.length === 0) {
+      return (
+        <div className="flex items-center justify-center h-full text-muted-foreground text-sm">
+          No relationships found
+        </div>
+      )
+    }
+
+    return <VirtualizedList relationships={relationships} />
+  }
+)
+
+const VirtualizedList = memo(({ relationships }: { relationships: Relation[] }) => {
+  const parentRef = useRef<HTMLDivElement>(null)
+
+  const virtualizer = useVirtualizer({
+    count: relationships.length,
+    getScrollElement: () => parentRef.current,
+    estimateSize: () => ITEM_HEIGHT,
+    overscan: 5
+  })
+
+  const virtualItems = virtualizer.getVirtualItems()
+
+  console.log('VirtualizedList Debug:', {
+    relationshipsCount: relationships.length,
+    totalSize: virtualizer.getTotalSize(),
+    virtualItemsCount: virtualItems.length,
+    firstItem: virtualItems[0],
+    parentRefCurrent: parentRef.current
+  })
+
+  return (
+    <div ref={parentRef} className="h-full overflow-auto">
+      <div
+        style={{
+          height: `${virtualizer.getTotalSize()}px`,
+          width: '100%',
+          position: 'relative',
+          paddingTop: '0.75rem',
+          paddingBottom: '0.75rem'
+        }}
+      >
+        {virtualItems.map((virtualRow) => {
+          const rel = relationships[virtualRow.index]
+
+          return (
+            <div
+              key={virtualRow.key}
+              style={{
+                position: 'absolute',
+                top: 0,
+                left: 0,
+                width: '100%',
+                height: `${virtualRow.size}px`,
+                transform: `translateY(${virtualRow.start}px)`
+              }}
+              className="pb-1 px-3"
+            >
+              <Badge variant={'outline'} className="h-8 px-2 py-1 w-full block">
+                  <div className="flex items-center gap-1 w-full min-w-0 h-full">
+                    <div className="min-w-0 flex-1 flex items-center">
+                      <RelationshipItem node={rel.source} />
+                    </div>
+                    <ArrowRight className="flex-shrink-0 opacity-60 h-4 w-4" />
+                    <div className="min-w-0 flex-1 flex items-center justify-center">
+                      <span className="opacity-60 text-xs truncate block">{rel.edge.label}</span>
+                    </div>
+                    <ArrowRight className="flex-shrink-0 opacity-60 h-4 w-4" />
+                    <div className="min-w-0 flex-1 flex items-center justify-end">
+                      <RelationshipItem node={rel.target} />
+                    </div>
+                  </div>
+                </Badge>
               </div>
-              <ArrowRight className="flex-shrink-0 opacity-60 h-4 w-4" />
-              <div className="min-w-0 flex-1 flex items-center justify-center">
-                <span className="opacity-60 text-xs truncate block">{rel.edge.label}</span>
-              </div>
-              <ArrowRight className="flex-shrink-0 opacity-60 h-4 w-4" />
-              <div className="min-w-0 flex-1 flex items-center justify-end">
-                <RelationshipItem node={rel.target} />
-              </div>
-            </div>
-          </Badge>
-        ))}
+            )
+          })}
+        </div>
       </div>
     )
   }
@@ -71,7 +134,7 @@ const RelationshipItem = memo(({ node }: { node: GraphNode }) => {
   const setCurrentNode = useGraphStore((s) => s.setCurrentNode)
   const handleClick = useCallback(() => {
     setCurrentNode(node)
-  }, [setCurrentNode])
+  }, [setCurrentNode, node])
   return (
     <button
       className="w-full h-full text-left hover:underline cursor-pointer flex items-center"