Sync frontend data through internal and external URLs in mobile Apps

[bgoncal]

Since the Apps use internal and external URL to access Home Assistant frontend, all information saved on browser level is restricted to the URL in use, this includes sidebar configuration, data tables and clipboard.

@bramkragten and @wendevlin proposed to have an app storage where the frontend can save, retrieve and clean this storage.

Should we have 1 storage for session-only and 1 for permanent data? Other alternatives?

[bgoncal]

Following: https://developer.mozilla.org/en-US/docs/Web/API/Storage

We could have:

"storage/get_item"
"storage/set_item"
"storage/remove_item"
"storage/clear"

[bramkragten]

Yes, we would need a sessionStorage and a localStorage. I would suggest to make this a parameter in the API.

getItem
storage: "session" | "local"
key: string

setItem
storage: "session" | "local"
key: string
value: string

removeItem
storage: "session" | "local"
key: string

clear
storage: "session" | "local"