Upload image for use in blocknote editor

[brendanlaschke]

Completes the work of #1964 to also upload images.

closes #1878

Fixed also local-storage not in gitignore

[charlesBochet]

LGTM with minor comment @brendanlaschke, thanks as always!

Found bugs

[charlesBochet]

@brendanlaschke I've found a bug actually. If the image is the first child of the body:

I think it's because it has no "content" section. We should update this logic:

  const body = JSON.parse(isNonEmptyString(task.body) ? task.body : '{}')[0]
    ?.content[0]?.text;

I also think we should extract it to an util getActivitySummary and cover it with jest tests to make sure it's behaving properly with task.body payload being: '{}', '', [...imageFirst], [...paragraphFirst], ... so this doesn't happen again

[brendanlaschke]

done - also for the similar preview in the notes tab ...