fix(ui): stabilize assistant message accumulation#16
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Use stable per-turn placeholder IDs for reasoning and MCP tool progress so incremental SSE updates replace the same chat card instead of accumulating. Also remove temporary streaming cards when a turn completes or fails. Made-with: Cursor
Coalesce adjacent assistant chunks within the same turn so streaming updates and resumed history render as a single reply instead of duplicated or vertically fragmented chat bubbles. Made-with: Cursor
Record the remaining frontend lockfile changes so the branch is fully synchronized before review and merge. Made-with: Cursor
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Summary
Test plan
cd kagent-ui && bun test \"lib/assistant/messages.test.ts\"cd kagent-ui && bun x tsc --noEmit(currently blocked by pre-existing type errors incomponents/project/settings/notification-settings.tsx,components/project/settings/system-settings.tsx, andcomponents/ui/chart.tsx)cd kagent-ui && bun run lint(current script resolves tonext lintwith an invalid project directory argument)Made with Cursor