Refresh proposal lists immediately after proposal creation

Multiple Chrome agents observed that submitting a proposal closes the modal but leaves the case card showing “Ingen forslag” until a hard refresh. One multi-role run created two identical proposals because the first successful submission was not reflected in the page; another safe retry avoided duplication only because the submit control disappeared. Restore the Turbo/broadcast update for proposal counts and rendered proposal content after canonical proposal creation, and ensure retries cannot duplicate a successful submission. Cover standard and bias proposals in pre-start and ongoing cases.