William Thorenfeldt

Create new hook `useAppLocalStorage` that uses app and org and uses the `useLocalStorage` hook 😄 We must also create a `@stduio/component` named `ResizeableLayout` that can be reused on dataModelPage, textEditorPage...

Linked with [#12730](https://github.com/Altinn/altinn-studio/issues/12730), and should be implemented in the same way

> After [@standeren](https://github.com/standeren)´s thorough investigation of all merge conflict messages, we have uncovered five messages and revised the text for them. [@Annikenkbrathen](https://github.com/Annikenkbrathen) also uncovered a couple of messages that are...

Blocked by #12787 and should be implemented the same way.