refactor: 移除多余依赖，统一 MUI 为唯一 UI 库

- 移除 radix-ui、clsx、tailwind-merge、class-variance-authority、react-router-dom

- 前后端全面适配 MUI 组件，清理残留 Tailwind 工具类引用

- 优化 Agent Loop 引擎、IPC 处理器、Provider Adapter 等后端模块

- 新增 Agent 网络工具通用设计文档 v2

src/hooks/useAgentStream.ts

@@ -41,8 +41,24 @@ export function useAgentStream(): void {
 
       // 每次收到迭代号时同步更新
       if (data.iteration != null && data.iteration !== getStore().currentIteration) {
-        console.log(`[useAgentStream] iteration: ${getStore().currentIteration} → ${data.iteration} (event: ${data.type})`);
+        const prevIteration = getStore().currentIteration;
         getStore().setCurrentIteration(data.iteration);
+
+        // 迭代号增大 → 新一轮 ReAct 迭代开始，创建新的 assistant 消息卡片
+        if (data.iteration > prevIteration && prevIteration > 0) {
+          const messages = getStore().messages;
+          const lastMsg = messages[messages.length - 1];
+          // 仅当上一条 assistant 消息已有内容时才创建新消息（避免空消息堆叠）
+          if (lastMsg?.role === 'assistant' && (lastMsg.content || lastMsg.toolCalls?.length || lastMsg.reasoningContent)) {
+            getStore().addMessage({
+              id: `msg_${Date.now()}_assistant`,
+              role: 'assistant',
+              content: '',
+              timestamp: Date.now(),
+              iteration: data.iteration,
+            });
+          }
+        }
       }
 
       switch (data.type) {
@@ -62,7 +78,7 @@ export function useAgentStream(): void {
             const messages = getStore().messages;
             const lastMsg = messages[messages.length - 1];
             if (lastMsg?.role === 'assistant') {
-              // 追加到最后一条 assistant 消息
+              // 追加到最后一条 assistant 消息（不可变更新）
               getStore().updateMessage(lastMsg.id, {
                 reasoningContent: (lastMsg.reasoningContent ?? '') + data.delta,
               });
@@ -74,6 +90,7 @@ export function useAgentStream(): void {
                 content: '',
                 reasoningContent: data.delta,
                 timestamp: Date.now(),
+                iteration: data.iteration ?? getStore().currentIteration,
               });
             }
           }
@@ -129,7 +146,7 @@ export function useAgentStream(): void {
           if (data.toolResult) {
             const msgs = getStore().messages;
             const lastMsg = msgs[msgs.length - 1];
-            if (lastMsg?.toolCalls) {
+            if (lastMsg?.role === 'assistant' && lastMsg?.toolCalls) {
               const updatedToolCalls = lastMsg.toolCalls.map((tc) =>
                 tc.id === data.toolResult!.toolCallId
                   ? {
@@ -150,10 +167,11 @@ export function useAgentStream(): void {
         // Token 使用统计
         case 'usage':
           if (data.usage) {
+            const cur = getStore().tokenUsage;
             getStore().updateTokenUsage({
-              inputTokens: data.usage.inputTokens ?? 0,
-              outputTokens: data.usage.outputTokens ?? 0,
-              totalTokens: data.usage.totalTokens ?? 0,
+              inputTokens: cur.inputTokens + (data.usage.inputTokens ?? 0),
+              outputTokens: cur.outputTokens + (data.usage.outputTokens ?? 0),
+              totalTokens: cur.totalTokens + (data.usage.totalTokens ?? 0),
             });
           }
           break;