refactor(ui,server): 移除冗余的 toolCalls 兼容字段

删除从 parts 中提取的冗余 toolCalls 数组：
- 移除 ToolCallInfo 类型定义
- 移除 Message.toolCalls 字段
- 移除 ToolCallsDisplay/ToolCallItem 组件
- 简化 sessions.ts 消息构建逻辑

packages/ui/src/api/types.ts

@@ -20,19 +20,6 @@ export type ToolStatus = 'pending' | 'running' | 'completed' | 'error';
 /** @deprecated 使用 ToolStatus 代替 */
 export type ToolCallStatus = ToolStatus;
 
-/**
- * 工具调用信息
- */
-export interface ToolCallInfo {
-  id: string;
-  name: string;
-  arguments: Record<string, unknown>;
-  status: ToolStatus;
-  result?: unknown;
-  error?: string;
-  duration?: number; // 执行时长 ms
-}
-
 // ============ 消息 Parts 相关 ============
 
 /**
@@ -128,8 +115,6 @@ export interface Message {
   parts: MessagePart[];
   /** 所有文本拼接（兼容字段） */
   content?: string;
-  /** 所有工具调用（兼容字段） */
-  toolCalls?: ToolCallInfo[];
   /** 是否包含推理过程 */
   hasReasoning?: boolean;
   /** 推理内容 */

packages/ui/src/components/ChatMessage.tsx

@@ -23,7 +23,7 @@ import { fadeInUp, smoothTransition } from '../utils/animations';
 import { getAgentDisplayName } from '../utils/agent';
 import { Markdown } from './Markdown';
 import { FileMentionText } from './FileMentionTag';
-import type { Message, ToolCallInfo, ToolStatus, ToolMessagePart, QuestionMessagePart, FileDiffInfo } from '../api/types.js';
+import type { Message, ToolStatus, ToolMessagePart, QuestionMessagePart, FileDiffInfo } from '../api/types.js';
 import { AskUserQuestion } from './AskUserQuestion.js';
 
 interface ChatMessageProps {
@@ -117,22 +117,17 @@ export const ChatMessage = forwardRef<HTMLDivElement, ChatMessageProps>(
         );
       }
 
-      // 回退：使用旧的 content + toolCalls 字段
+      // 回退：使用 content 字段（无 parts 时）
       return (
-        <>
-          {!isUser && message.toolCalls && message.toolCalls.length > 0 && (
-            <ToolCallsDisplay toolCalls={message.toolCalls} />
+        <div className="message-content text-fg-secondary">
+          {isUser ? (
+            <div>
+              <FileMentionText text={message.content ?? ''} />
+            </div>
+          ) : (
+            <Markdown content={message.content ?? ''} />
           )}
-          <div className="message-content text-fg-secondary">
-            {isUser ? (
-              <div>
-                <FileMentionText text={message.content ?? ''} />
-              </div>
-            ) : (
-              <Markdown content={message.content ?? ''} />
-            )}
-          </div>
-        </>
+        </div>
       );
     };
 
@@ -384,109 +379,3 @@ function formatDuration(ms?: number): string {
   return `${(ms / 1000).toFixed(1)}s`;
 }
 
-/**
- * 工具调用列表容器
- */
-interface ToolCallsDisplayProps {
-  toolCalls: ToolCallInfo[];
-}
-
-function ToolCallsDisplay({ toolCalls }: ToolCallsDisplayProps) {
-  return (
-    <div className="mb-3 space-y-2">
-      {toolCalls.map((toolCall) => (
-        <ToolCallItem key={toolCall.id} toolCall={toolCall} />
-      ))}
-    </div>
-  );
-}
-
-/**
- * 单个工具调用项
- */
-interface ToolCallItemProps {
-  toolCall: ToolCallInfo;
-}
-
-function ToolCallItem({ toolCall }: ToolCallItemProps) {
-  const [expanded, setExpanded] = useState(false);
-  const hasDetails =
-    Object.keys(toolCall.arguments).length > 0 ||
-    toolCall.result !== undefined ||
-    toolCall.error !== undefined;
-
-  return (
-    <div className="border border-line rounded-lg overflow-hidden bg-surface-subtle/30">
-      {/* 头部：工具名称、状态、时长 */}
-      <button
-        onClick={() => hasDetails && setExpanded(!expanded)}
-        className={cn(
-          'w-full flex items-center gap-2 px-3 py-2 text-sm',
-          hasDetails && 'hover:bg-surface-muted/50 cursor-pointer',
-          !hasDetails && 'cursor-default'
-        )}
-      >
-        <Wrench size={14} className="text-fg-muted flex-shrink-0" />
-        <span className="font-mono text-fg-secondary flex-1 text-left truncate">
-          {toolCall.name}
-        </span>
-        {getStatusIcon(toolCall.status)}
-        {toolCall.duration && (
-          <span className="text-xs text-fg-subtle">{formatDuration(toolCall.duration)}</span>
-        )}
-        {hasDetails && (
-          <span className="text-fg-subtle">
-            {expanded ? <ChevronDown size={14} /> : <ChevronRight size={14} />}
-          </span>
-        )}
-      </button>
-
-      {/* 展开的详情 */}
-      <AnimatePresence>
-        {expanded && hasDetails && (
-          <motion.div
-            initial={{ height: 0, opacity: 0 }}
-            animate={{ height: 'auto', opacity: 1 }}
-            exit={{ height: 0, opacity: 0 }}
-            transition={{ duration: 0.2 }}
-            className="border-t border-line overflow-hidden"
-          >
-            <div className="px-3 py-2 space-y-2 text-xs">
-              {/* 参数 */}
-              {Object.keys(toolCall.arguments).length > 0 && (
-                <div>
-                  <div className="text-fg-subtle mb-1">Arguments:</div>
-                  <pre className="bg-surface-base rounded p-2 overflow-x-auto text-fg-muted max-h-48 overflow-y-auto">
-                    {JSON.stringify(toolCall.arguments, null, 2)}
-                  </pre>
-                </div>
-              )}
-
-              {/* 结果 */}
-              {toolCall.result !== undefined && (
-                <div>
-                  <div className="text-fg-subtle mb-1">Result:</div>
-                  <pre className="bg-surface-base rounded p-2 overflow-x-auto text-green-400 max-h-48 overflow-y-auto">
-                    {typeof toolCall.result === 'string'
-                      ? toolCall.result
-                      : JSON.stringify(toolCall.result, null, 2)}
-                  </pre>
-                </div>
-              )}
-
-              {/* 错误 */}
-              {toolCall.error && (
-                <div>
-                  <div className="text-red-400 mb-1">Error:</div>
-                  <pre className="bg-surface-base rounded p-2 overflow-x-auto text-red-300 max-h-48 overflow-y-auto">
-                    {toolCall.error}
-                  </pre>
-                </div>
-              )}
-            </div>
-          </motion.div>
-        )}
-      </AnimatePresence>
-    </div>
-  );
-}