Add linear mode (#6670)

![linear-mode](https://github.com/user-attachments/assets/d1aa078a-00a8-4e71-86d5-ee929b269c90)

See also: #6642

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6670-Add-linear-mode-2aa6d73d365081d08887e4a6db3a8fa0)
by [Unito](https://www.unito.io)

src/platform/workflow/management/stores/workflowStore.ts

@@ -13,6 +13,7 @@ import type {
   ComfyWorkflowJSON,
   NodeId
 } from '@/platform/workflow/validation/schemas/workflowSchema'
+import { useCanvasStore } from '@/renderer/core/canvas/canvasStore'
 import { useWorkflowThumbnail } from '@/renderer/core/thumbnail/useWorkflowThumbnail'
 import { api } from '@/scripts/api'
 import { app as comfyApp } from '@/scripts/app'
@@ -329,6 +330,7 @@ export const useWorkflowStore = defineStore('workflow', () => {
       tabActivationHistory.value.shift()
     }
 
+    useCanvasStore().linearMode = !!loadedWorkflow.activeState.extra?.linearMode
     return loadedWorkflow
   }