[Frontend] Chat performance: fix streaming re-renders and message load#34
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Reduce unnecessary work during streaming and on chat open.
Key changes
useMessagesSync— replacemessagesdep with a ref so the Supabase channel is created once per chat, not on every message updateMessageList— trigger scroll only on message count change, not every streaming chunk; use instant instead of smooth to avoid layout thrashingChatMessage— wrap inmemoto skip ReactMarkdown re-parse for messages that haven't changedCloses #31