feat(chat,langgraph): message actions + streaming-stability fixes#177
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…tability Combined patch addressing live-smoke findings + a copilotkit chat-UI audit. ## chat (0.0.10 → 0.0.11) - New primitive: ChatMessageActionsComponent (regenerate / copy / thumbs up / thumbs down) auto-rendered under each assistant message in the default chat composition. Mirrors copilotkit's AssistantMessage controls: hidden by default, fades in via :host-context() on hover or on the current message, always visible on mobile, suppressed during streaming. Copy uses the navigator clipboard API with a 2000ms checkmark feedback fallback to execCommand. Thumb buttons toggle between active/inactive on click. New outputs on chat: `regenerate`, `rate`, `messageCopy`. `regenerate` calls `agent.reload()`. - Caret animation: switched from harsh step-end blink to copilotkit's smooth pulse (2s cubic-bezier(0.4, 0, 0.6, 1)) with marginTop and vertical-align tweaks so the caret sits inline with the last text line. - Public API exports the new component. ## langgraph (0.0.6 → 0.0.9) - buildSubmitPayload: optimistic human messages now carry both `type: 'human'` (what toMessage reads) and `role: 'human'` (what the server expects). Without `type`, toMessage fell through to the 'ai' default and the user's question rendered as an assistant message — the duplicate-bubble bug we observed in live testing. - values-event sync: ALWAYS merge state messages into existing instead of replacing. LangGraph emits intermediate values events during streaming whose state.messages can lag behind what we've already received via messages-tuple. Replacing dropped the partial AI (and even the optimistic human) and tore down their DOM mid-stream. Verified against the local LangGraph LLM backend with MutationObserver instrumentation: a single-turn streaming response now produces exactly two CHAT-MESSAGE additions and zero removals, with action controls appearing only after the stream finishes. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Why
Three things converged this round:
chat (0.0.10 → 0.0.11)
langgraph (0.0.6 → 0.0.9)
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🤖 Generated with Claude Code