fix: correct i18n key format and remove dead error icon/title code

- Fixed i18n key format in executeCommandTool.ts: changed 'common:errors:command_timeout' to 'common:errors.command_timeout' to match the actual key structure
- Removed dead code path for error icon/title in ChatRow.tsx since 'say:error' messages are rendered via CollapsibleErrorSection component

src/core/tools/executeCommandTool.ts

@@ -278,7 +278,7 @@ export async function executeCommand(
 				provider?.postMessageToWebview({ type: "commandExecutionStatus", text: JSON.stringify(status) })
 				await task.say(
 					"error",
-					t("common:errors:command_timeout", { seconds: commandExecutionTimeoutSeconds }),
+					t("common:errors.command_timeout", { seconds: commandExecutionTimeoutSeconds }),
 					undefined,
 					undefined,
 					undefined,

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

@@ -209,13 +209,6 @@ export const ChatRowContent = ({
 
 	const [icon, title] = useMemo(() => {
 		switch (type) {
-			case "error":
-				return [
-					<span
-						className="codicon codicon-error"
-						style={{ color: errorColor, marginBottom: "-1.5px" }}></span>,
-					<span style={{ color: errorColor, fontWeight: "bold" }}>{message.title || t("chat:error")}</span>,
-				]
 			case "mistake_limit_reached":
 				return [
 					<span