fix: add unique key to ProposalForm for better rendering with proposalId

Author: Starefossen

src/app/(cfp)/cfp/proposal/[[...id]]/page.tsx

@@ -232,6 +232,7 @@ export default async function ProposalPage({
           <div className="flex-1">
             <div className="rounded-lg border border-gray-200 bg-white p-6 shadow-sm dark:border-gray-700 dark:bg-gray-800">
               <ProposalForm
+                key={proposalId || 'new'}
                 initialProposal={proposal}
                 initialSpeaker={speaker}
                 proposalId={proposalId}