Add tests for various user profile setups to sidebar (#212)

* Add tests for various user profile setups to sidebar

* Don't show empty user image if it isn't there

* @adamchalmer review

src/useStore.ts

@@ -1,4 +1,4 @@
-import create from 'zustand'
+import { create } from 'zustand'
 import { persist } from 'zustand/middleware'
 import { addLineHighlight, EditorView } from './editor/highlightextension'
 import { abstractSyntaxTree } from './lang/abstractSyntaxTree'