Only persist workflow on workflow change/switch (#1576)

* Only persist workflow on workflow change/switch

* nit

* Add playwright test

* Add modify test

* nit

* Fix playwright tests

* Update test expectations [skip ci]

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Co-authored-by: github-actions <github-actions@github.com>

src/scripts/app.ts

@@ -1865,15 +1865,6 @@ export class ComfyApp {
       await this.loadGraphData()
     }
 
-    // Save current workflow automatically
-    setInterval(() => {
-      const workflow = JSON.stringify(this.serializeGraph())
-      localStorage.setItem('workflow', workflow)
-      if (api.clientId) {
-        sessionStorage.setItem(`workflow:${api.clientId}`, workflow)
-      }
-    }, 1000)
-
     this.#addDrawNodeHandler()
     this.#addDrawGroupsHandler()
     this.#addDropHandler()