Close but htmx with SSE and dom swaps and morphing gets you there without reinventing any wheels.
Pretty much every web app I build has this pattern in it from day 1, as they all quickly expand to have a realtime inbox and notifications subsystem to support workflows and agents.
Pretty much every web app I build has this pattern in it from day 1, as they all quickly expand to have a realtime inbox and notifications subsystem to support workflows and agents.