Ability to share creation URLs

[ptbrowne]

While creating a chart, we cannot share the URLs to anyone as the state of the chart is saved locally. This is confusing as users think they can share the URLs, but in fact those URLs do not work. It makes sharing a bad state hard as we have to reproduce exactly what the person has done.

Describe the solution you'd like

While creating a chart, the state should be saved server side, as a draft.
Drafts could be edited
Drafts can be shared with any other person, and the person can see and edit the draft (this could change when we introduce login)

This could greatly benefit bug reporting as we would be able to just send a draft URL.
Drafts are part of the login epic, but this could also be worked on without the login epic.
It would also make it possible to share Vercel comments on chart creation pages as the URL will be correct

Estimation: 2 days

[AnninaWalker]

@ptbrowne I've created some Mockups regarding this topic here
I've also added some Questions on the same Notion Page regarding Autosaving vs. Manually Saving. Happy to hear your input.

[ptbrowne]

PR: #945

[sosiology]

@ptbrowne this issue has been around for a while, may I close it or what do you think?

[ptbrowne]

Since now, draft urls can be shared, the problem is fixed.