fix: show sent desktop messages immediately#3056
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Desktop chat waited for the backend's first real event before adding the user's submitted message to the transcript. This made short prompts look delayed whenever the bridge, provider, or model had startup latency. Show the submitted message right away with a pending state so the UI responds immediately. Confirm that message when the first backend event arrives, remove it if the user cancels before confirmation, and mark it failed only when submission fails before the backend has accepted the turn. Add reducer coverage for immediate display, confirmation without duplicates, cancel-before-confirmation, early submit failure, and late submit rejection. Co-authored-by: Cursor <cursoragent@cursor.com>
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This was referenced Jun 4, 2026
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Desktop chat waited for the backend's first real event before adding the user's submitted message to the transcript. This made short prompts look delayed whenever the bridge, provider, or model had startup latency.
Show the submitted message right away with a pending state so the UI responds immediately. Confirm that message when the first backend event arrives, remove it if the user cancels before confirmation, and mark it failed only when submission fails before the backend has accepted the turn.
Add reducer coverage for immediate display, confirmation without duplicates, cancel-before-confirmation, early submit failure, and late submit rejection.