fix: address review feedback

- Remove unused lastCheckpointInfo parameter from ChatRowContent
- Remove unreachable return null statement
- Optimize useMemo performance for lastCheckpointInfo calculation

Author: roomote

webview-ui/src/components/chat/ChatRow.tsx

@@ -117,7 +117,6 @@ export const ChatRowContent = ({
 	onBatchFileResponse,
 	isFollowUpAnswered,
 	editable,
-	lastCheckpointInfo: _lastCheckpointInfo,
 }: ChatRowContentProps) => {
 	const { t } = useTranslation()
 	const { mcpServers, alwaysAllowMcp, currentCheckpoint: _currentCheckpoint, mode } = useExtensionState()
@@ -1345,9 +1344,6 @@ export const ChatRowContent = ({
 					return null
 			}
 	}
-
-	// Default return for messages that don't match any case
-	return null
 }
 
 // Create a wrapper component to handle the checkpoint UI
@@ -1356,7 +1352,7 @@ export const ChatRowWithCheckpoint: React.FC<ChatRowContentProps> = (props) => {
 	const { currentCheckpoint } = useExtensionState()
 
 	// Render the regular content
-	const content = <ChatRowContent {...props} lastCheckpointInfo={null} />
+	const content = <ChatRowContent {...props} />
 
 	// Check if we should show checkpoint UI
 	const shouldShowCheckpoint =

webview-ui/src/components/chat/ChatView.tsx

@@ -145,10 +145,9 @@ const ChatViewComponent: React.ForwardRefRenderFunction<ChatViewRef, ChatViewPro
 		return getLatestTodo(messages)
 	}, [messages])
 
-	// Track the last checkpoint message
+	// Track the last checkpoint message - optimized to only recalculate when checkpoint messages change
+	const checkpointMessages = useMemo(() => messages.filter((msg) => msg.say === "checkpoint_saved"), [messages])
 	const lastCheckpointInfo = useMemo(() => {
-		// Find the last checkpoint_saved message
-		const checkpointMessages = messages.filter((msg) => msg.say === "checkpoint_saved")
 		if (checkpointMessages.length === 0) return null
 
 		const lastCheckpoint = checkpointMessages[checkpointMessages.length - 1]
@@ -157,7 +156,7 @@ const ChatViewComponent: React.ForwardRefRenderFunction<ChatViewRef, ChatViewPro
 			commitHash: lastCheckpoint.text || "",
 			checkpoint: lastCheckpoint.checkpoint,
 		}
-	}, [messages])
+	}, [checkpointMessages])
 
 	const modifiedMessages = useMemo(() => combineApiRequests(combineCommandSequences(messages.slice(1))), [messages])