feat(network): add undo/redo buttons to DiagramHeader

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

frontend/src/pages/NetworkDiagrams/DiagramEditor.tsx

@@ -628,29 +628,23 @@ function DiagramEditorInner() {
 
   return (
     <div className="flex h-full flex-col">
-      {(() => {
-        // eslint-disable-next-line @typescript-eslint/no-explicit-any
-        const DiagramHeaderAny = DiagramHeader as any
-        return (
-          <DiagramHeaderAny
-            name={name}
-            clientName={clientName}
-            isDirty={isDirty}
-            isSaving={isSaving}
-            lastSavedAt={lastSavedAt}
-            diagramId={diagramId}
-            onNameChange={(n: string) => { setName(n); setIsDirty(true) }}
-            onSave={handleSave}
-            onExportPng={handleExportPng}
-            onExportPdf={handleExportPdf}
-            onExportJson={handleExportJson}
-            onUndo={undo}
-            onRedo={redo}
-            canUndo={canUndo}
-            canRedo={canRedo}
-          />
-        )
-      })()}
+      <DiagramHeader
+        name={name}
+        clientName={clientName}
+        isDirty={isDirty}
+        isSaving={isSaving}
+        lastSavedAt={lastSavedAt}
+        diagramId={diagramId}
+        onNameChange={(n: string) => { setName(n); setIsDirty(true) }}
+        onSave={handleSave}
+        onExportPng={handleExportPng}
+        onExportPdf={handleExportPdf}
+        onExportJson={handleExportJson}
+        onUndo={undo}
+        onRedo={redo}
+        canUndo={canUndo}
+        canRedo={canRedo}
+      />
       <div className="flex flex-1 min-h-0">
         <DeviceToolbar deviceTypes={deviceTypes} onDeviceTypesChange={loadDeviceTypes} />
         <div className="flex flex-1 flex-col min-h-0">