nit

frontend/src/app/canvas/CanvasRoute.tsx

@@ -2,7 +2,7 @@
  * Route wrapper for the canvas: resolves projectId from URL and updates lastEditedAt on open.
  */
 
-import React, { useEffect } from 'react'
+import React, { useEffect, useRef } from 'react'
 import { useParams } from 'react-router-dom'
 import { CanvasPage } from './CanvasPage'
 import { usePlatform } from '@/app/kosmos/KosmosContext'
@@ -10,12 +10,14 @@ import { usePlatform } from '@/app/kosmos/KosmosContext'
 export function CanvasRoute() {
   const { projectId } = useParams<{ projectId: string }>()
   const { projects, updateLastEdited } = usePlatform()
+  const updateLastEditedRef = useRef(updateLastEdited)
+  updateLastEditedRef.current = updateLastEdited
 
   const project = projects.find((p) => p.id === projectId)
 
   useEffect(() => {
-    if (projectId) updateLastEdited(projectId)
-  }, [projectId, updateLastEdited])
+    if (projectId) updateLastEditedRef.current(projectId)
+  }, [projectId])
 
   if (!projectId) return null
   if (!project) {