feat(chat): optimistic message on send#763
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The message previously only appeared after the run persisted and streamed it back, which read as a dropped message. Echo it optimistically the moment they hit send, and drop the echo once the persisted user message arrives (or on submit error). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Host feedback: 'as soon as I hit enter, my message does not immediately show up is a bit worrying.'
The message now appears instantly (optimistic echo), and is replaced by the persisted one once it streams back (deduped by content), or cleared on submit error. Second slice of the chat redesign (#757).
Verified: tsc, biome (repo-level), vite build.
🤖 Generated with Claude Code