feat: 省略旧消息的代码 diff 展示，仅保留最新消息的完整 diff

src/components/MessageRow.tsx

@@ -55,6 +55,7 @@ export type Props = {
   columns: number
   isLoading: boolean
   lookups: ReturnType<typeof buildMessageLookups>
+  shouldCollapseDiffs?: boolean
 }
 
 /**
@@ -141,6 +142,7 @@ function MessageRowImpl({
   columns,
   isLoading,
   lookups,
+  shouldCollapseDiffs,
 }: Props): React.ReactNode {
   const isTranscriptMode = screen === 'transcript'
   const isGrouped = msg.type === 'grouped_tool_use'
@@ -221,6 +223,7 @@ function MessageRowImpl({
       isUserContinuation={isUserContinuation}
       lastThinkingBlockId={lastThinkingBlockId}
       latestBashOutputUUID={latestBashOutputUUID}
+      shouldCollapseDiffs={shouldCollapseDiffs}
     />
   )
   // OffscreenFreeze: the outer React.memo already bails for static messages,