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/components/trace/TokenUsage.tsx

@@ -27,7 +27,7 @@ export function TokenUsage(): React.JSX.Element {
   return (
     <Box sx={{ mt: 2, pt: 2, borderTop: 1, borderColor: 'divider', flexShrink: 0 }}>
       {/* 标题 */}
-      <Stack direction="row" spacing={1} alignItems="center" sx={{ mb: 1.5 }}>
+      <Stack direction="row" spacing={1} sx={{ mb: 1.5, alignItems: 'center' }}>
         <Zap size={14} style={{ color: '#fbbf24' }} />
         <Typography variant="caption" sx={{ fontWeight: 600, textTransform: 'uppercase', letterSpacing: 1, color: 'text.secondary' }}>
           Token 用量

src/components/trace/TraceStep.tsx

@@ -2,7 +2,7 @@
  * TraceStep — 单个 Trace 步骤
  */
 
-import { useState } from 'react';
+import { useState, useEffect } from 'react';
 import { Box, Typography, IconButton, Collapse, Stack } from '@mui/material';
 import { ChevronDown, ChevronRight, CircleDot, CheckCircle, Loader2 } from 'lucide-react';
 import { TRACE_STATE_COLORS, TRACE_STATE_LABELS } from '@renderer/lib/constants';
@@ -13,6 +13,7 @@ interface TraceStepProps { step: TraceStepType; isCurrent?: boolean; }
 
 export function TraceStep({ step, isCurrent }: TraceStepProps): React.JSX.Element {
   const [expanded, setExpanded] = useState(false);
+  useEffect(() => { setExpanded(isCurrent ?? false); }, [isCurrent]);
   const color = TRACE_STATE_COLORS[step.state] ?? '#8b8fa7';
   const label = TRACE_STATE_LABELS[step.state] ?? step.state;
   const duration = step.completedAt ? step.completedAt - step.startedAt : null;

src/components/trace/TraceViewer.tsx

@@ -15,7 +15,7 @@ export function TraceViewer(): React.JSX.Element {
 
   return (
     <Box sx={{ flex: 1, display: 'flex', flexDirection: 'column', minHeight: 0, overflow: 'hidden' }}>
-      <Stack direction="row" spacing={1} alignItems="center" sx={{ mb: 1.5, flexShrink: 0 }}>
+      <Stack direction="row" spacing={1} sx={{ mb: 1.5, flexShrink: 0, alignItems: 'center' }}>
         <Activity size={14} style={{ color: '#818cf8' }} />
         <Typography variant="caption" sx={{ fontWeight: 600, textTransform: 'uppercase', letterSpacing: 1, color: 'text.secondary' }}>
           Trace Viewer