feat(network): add alignment toolbar to PropertiesPanel for multi-select

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/components/network/hooks/useDiagramCommands.ts

@@ -1,5 +1,5 @@
 import { useCallback } from 'react'
-import { Node, Edge } from '@xyflow/react'
+import type { Node, Edge } from '@xyflow/react'
 
 interface UseDiagramCommandsParams {
   nodes: Node[]

frontend/src/components/network/panels/PropertiesPanel.tsx

@@ -1,5 +1,10 @@
 import { useCallback, useState, useEffect } from 'react'
-import { Trash2, Minus, Spline, GitBranch, BringToFront, SendToBack } from 'lucide-react'
+import {
+  Trash2, Minus, Spline, GitBranch, BringToFront, SendToBack,
+  AlignStartVertical, AlignCenterHorizontal, AlignEndVertical,
+  AlignStartHorizontal, AlignCenterVertical, AlignEndHorizontal,
+  AlignHorizontalSpaceAround, AlignVerticalSpaceAround,
+} from 'lucide-react'
 import { cn } from '@/lib/utils'
 import type { DeviceProperties, DiagramEdge } from '@/types'
 import type { Node, Edge } from '@xyflow/react'
@@ -15,6 +20,17 @@ interface PropertiesPanelProps {
   onSendToBack: (nodeId: string) => void
   onDeleteNode: (nodeId: string) => void
   onDeleteEdge: (edgeId: string) => void
+  selectedNodeCount: number
+  onAlignLeft: () => void
+  onAlignRight: () => void
+  onAlignCenterH: () => void
+  onAlignTop: () => void
+  onAlignBottom: () => void
+  onAlignCenterV: () => void
+  onDistributeH: () => void
+  onDistributeV: () => void
+  canAlign: boolean
+  canDistribute: boolean
 }
 
 type NodeStatus = 'online' | 'offline' | 'degraded' | 'unknown'
@@ -78,6 +94,17 @@ export function PropertiesPanel({
   onSendToBack,
   onDeleteNode,
   onDeleteEdge,
+  selectedNodeCount,
+  onAlignLeft,
+  onAlignRight,
+  onAlignCenterH,
+  onAlignTop,
+  onAlignBottom,
+  onAlignCenterV,
+  onDistributeH,
+  onDistributeV,
+  canAlign,
+  canDistribute,
 }: PropertiesPanelProps) {
   const [deleteConfirm, setDeleteConfirm] = useState(false)
 
@@ -98,6 +125,64 @@ export function PropertiesPanel({
     onNodeUpdate(selectedNode.id, { label: value } as Partial<DeviceNodeData>)
   }, [selectedNode, onNodeUpdate])
 
+  if (!selectedNode && !selectedEdge && selectedNodeCount >= 2) {
+    return (
+      <div className="w-[260px] border-l border-default bg-sidebar flex flex-col">
+        <div className="px-4 py-3 border-b border-default">
+          <div className="text-xs font-medium text-muted-foreground uppercase tracking-wider">
+            {selectedNodeCount} nodes selected
+          </div>
+        </div>
+        <div className="p-3 flex flex-col gap-4">
+          {canAlign && (
+            <div>
+              <div className="text-[10px] font-medium text-muted uppercase tracking-wider mb-2">Align</div>
+              <div className="grid grid-cols-3 gap-1">
+                {([
+                  { label: 'Left', icon: AlignStartVertical, action: onAlignLeft },
+                  { label: 'Center', icon: AlignCenterHorizontal, action: onAlignCenterH },
+                  { label: 'Right', icon: AlignEndVertical, action: onAlignRight },
+                  { label: 'Top', icon: AlignStartHorizontal, action: onAlignTop },
+                  { label: 'Middle', icon: AlignCenterVertical, action: onAlignCenterV },
+                  { label: 'Bottom', icon: AlignEndHorizontal, action: onAlignBottom },
+                ] as const).map(({ label, icon: Icon, action }) => (
+                  <button
+                    key={label}
+                    onClick={action}
+                    title={`Align ${label}`}
+                    className="flex flex-col items-center gap-1 p-2 rounded bg-elevated hover:bg-card border border-default hover:border-hover transition-colors text-muted-foreground hover:text-primary"
+                  >
+                    <Icon size={14} />
+                    <span className="text-[9px]">{label}</span>
+                  </button>
+                ))}
+              </div>
+            </div>
+          )}
+          {canDistribute && (
+            <div>
+              <div className="text-[10px] font-medium text-muted uppercase tracking-wider mb-2">Distribute</div>
+              <div className="grid grid-cols-2 gap-1">
+                <button
+                  onClick={onDistributeH}
+                  className="flex items-center gap-1.5 px-2 py-1.5 rounded bg-elevated hover:bg-card border border-default hover:border-hover transition-colors text-muted-foreground hover:text-primary text-xs"
+                >
+                  <AlignHorizontalSpaceAround size={13} /> Horizontal
+                </button>
+                <button
+                  onClick={onDistributeV}
+                  className="flex items-center gap-1.5 px-2 py-1.5 rounded bg-elevated hover:bg-card border border-default hover:border-hover transition-colors text-muted-foreground hover:text-primary text-xs"
+                >
+                  <AlignVerticalSpaceAround size={13} /> Vertical
+                </button>
+              </div>
+            </div>
+          )}
+        </div>
+      </div>
+    )
+  }
+
   if (!selectedNode && !selectedEdge) {
     return (
       <div className="flex h-full w-[260px] flex-col items-center justify-center border-l border-default bg-sidebar px-4">

frontend/src/pages/NetworkDiagrams/DiagramEditor.tsx

@@ -709,6 +709,17 @@ function DiagramEditorInner() {
           onSendToBack={handleSendToBack}
           onDeleteNode={handleDeleteNode}
           onDeleteEdge={handleDeleteEdge}
+          selectedNodeCount={nodes.filter(n => n.selected).length}
+          onAlignLeft={diagramCommands.alignLeft}
+          onAlignRight={diagramCommands.alignRight}
+          onAlignCenterH={diagramCommands.alignCenterH}
+          onAlignTop={diagramCommands.alignTop}
+          onAlignBottom={diagramCommands.alignBottom}
+          onAlignCenterV={diagramCommands.alignCenterV}
+          onDistributeH={diagramCommands.distributeHorizontally}
+          onDistributeV={diagramCommands.distributeVertically}
+          canAlign={diagramCommands.canAlign}
+          canDistribute={diagramCommands.canDistribute}
         />
       </div>
       {contextMenu && (