Allow graph navigation by browser forward/backward

[AustinMroz]

• On graph change, set the graph.id as location hash
• Use window.onhashchange to navigate to the target graph.id either in the current, or any other loaded workflow.

canvasStore.currentGraph does not trigger when app.loadGraphData is called. A trigger could be forced here, but I'm concerned about side effects. Instead updateHash is manually called.

Code search shows that there are no current custom nodes using onhashchange

┆Issue is synchronized with this Notion page by Unito