perf(render): memo 稳定化 + Context useMemo + 列表项 memo，消除全量重渲染 - #42
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PR2 — 运行时渲染
ToastContext/ChannelContext:
- value 加 useMemo（参照 GlobalTaskContext 已有模式），避免每次 Provider render 新建 value
导致所有 useToast/useChannels 消费者重渲染
Papers.tsx（消除勾选/toast 时 20 卡全量重渲染）:
- PaperListItem/PaperGridItem props 改稳定 callback：onSelect/onFavorite/onReject/onNavigate
接 id/path 由子组件内部用 paper.id 调用，消除每 render 内联箭头新引用击穿 memo
Agent.tsx（长会话每键不再重渲染 N ChatBlock）:
- onOpenArtifact 提为 useCallback handleOpenArtifact（setCanvas 是稳定 useState setter）
- EmptyState onSelect={(p)=>handleSend(p)} 改直接传 handleSend（已是 useCallback）
Collect.tsx:
- SearchResultCard 加 memo + props 稳定化：onToggle 改 handleResultToggle useCallback 接 index，
onNavigate 直接传 navigate，消除内联箭头击穿 memo
Statistics.tsx:
- TopicCard 加 memo（props 仅 stat，浅比较有效）
Pipelines.tsx:
- 抽 RunRow memo 组件，navigate 稳定引用传入，消除筛选切换时全量行重渲染
(table 虚拟化作为后续，当前规模行 memo 已消除主要开销)
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PR2 — 运行时渲染（中风险）
ToastContext/ChannelContext
Papers.tsx（消除勾选/toast 时 20 卡全量重渲染）
Agent.tsx（长会话每键不再重渲染 N ChatBlock）
Collect.tsx
Statistics.tsx
Pipelines.tsx
验证