UI: Unify trader colors between Leaderboard and Performance Chart

Problem:
- Leaderboard used ai_model-based colors (qwen=purple, other=blue)
- Performance Comparison used index-based colors (10 color pool)
- This caused color mismatch between the two components
- Same trader showed different colors in different sections

Solution:
- Create shared color utility (utils/traderColors.ts)
- Define single color pool with 10 distinct colors
- Implement unified getTraderColor function based on trader index
- Update both ComparisonChart and CompetitionPage to use shared utility

Changes:
- New file: web/src/utils/traderColors.ts (shared color logic)
- Updated: ComparisonChart.tsx (use shared utility)
- Updated: CompetitionPage.tsx (use shared utility in Leaderboard
  and Head-to-Head sections)

Now traders consistently display the same color across all UI sections.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: tinkle-community <tinklefund@gmail.com>

web/src/components/ComparisonChart.tsx

@@ -13,6 +13,7 @@ import {
 import useSWR from 'swr';
 import { api } from '../lib/api';
 import type { CompetitionTraderData } from '../types';
+import { getTraderColor } from '../utils/traderColors';
 
 interface ComparisonChartProps {
   traders: CompetitionTraderData[];
@@ -177,26 +178,8 @@ export function ComparisonChart({ traders }: ComparisonChartProps) {
     ];
   };
 
-  // Trader颜色配置 - 为每个trader分配不同的颜色
-  // 使用更丰富的颜色池，确保多个trader时不重复
-  const TRADER_COLORS = [
-    '#60a5fa', // blue-400
-    '#c084fc', // purple-400
-    '#34d399', // emerald-400
-    '#fb923c', // orange-400
-    '#f472b6', // pink-400
-    '#fbbf24', // amber-400
-    '#38bdf8', // sky-400
-    '#a78bfa', // violet-400
-    '#4ade80', // green-400
-    '#fb7185', // rose-400
-  ];
-
-  const getTraderColor = (traderId: string) => {
-    const traderIndex = traders.findIndex((t) => t.trader_id === traderId);
-    // 如果超出颜色池大小，循环使用
-    return TRADER_COLORS[traderIndex % TRADER_COLORS.length];
-  };
+  // 使用统一的颜色分配逻辑（与Leaderboard保持一致）
+  const traderColor = (traderId: string) => getTraderColor(traders, traderId);
 
   // 自定义Tooltip - Binance Style
   const CustomTooltip = ({ active, payload }: any) => {
@@ -216,7 +199,7 @@ export function ComparisonChart({ traders }: ComparisonChartProps) {
               <div key={trader.trader_id} className="mb-1.5 last:mb-0">
                 <div
                   className="text-xs font-semibold mb-0.5"
-                  style={{ color: getTraderColor(trader.trader_id) }}
+                  style={{ color: traderColor(trader.trader_id) }}
                 >
                   {trader.trader_name}
                 </div>
@@ -257,8 +240,8 @@ export function ComparisonChart({ traders }: ComparisonChartProps) {
                 x2="0"
                 y2="1"
               >
-                <stop offset="5%" stopColor={getTraderColor(trader.trader_id)} stopOpacity={0.9} />
-                <stop offset="95%" stopColor={getTraderColor(trader.trader_id)} stopOpacity={0.2} />
+                <stop offset="5%" stopColor={traderColor(trader.trader_id)} stopOpacity={0.9} />
+                <stop offset="95%" stopColor={traderColor(trader.trader_id)} stopOpacity={0.2} />
               </linearGradient>
             ))}
           </defs>
@@ -305,10 +288,10 @@ export function ComparisonChart({ traders }: ComparisonChartProps) {
               key={trader.trader_id}
               type="monotone"
               dataKey={`${trader.trader_id}_pnl_pct`}
-              stroke={getTraderColor(trader.trader_id)}
+              stroke={traderColor(trader.trader_id)}
               strokeWidth={3}
-              dot={displayData.length < 50 ? { fill: getTraderColor(trader.trader_id), r: 3 } : false}
-              activeDot={{ r: 6, fill: getTraderColor(trader.trader_id), stroke: '#fff', strokeWidth: 2 }}
+              dot={displayData.length < 50 ? { fill: traderColor(trader.trader_id), r: 3 } : false}
+              activeDot={{ r: 6, fill: traderColor(trader.trader_id), stroke: '#fff', strokeWidth: 2 }}
               name={trader.trader_name}
               connectNulls
             />

web/src/components/CompetitionPage.tsx

@@ -4,6 +4,7 @@ import type { CompetitionData } from '../types';
 import { ComparisonChart } from './ComparisonChart';
 import { useLanguage } from '../contexts/LanguageContext';
 import { t } from '../i18n/translations';
+import { getTraderColor } from '../utils/traderColors';
 
 export function CompetitionPage() {
   const { language } = useLanguage();
@@ -108,7 +109,7 @@ export function CompetitionPage() {
           <div className="space-y-2">
             {sortedTraders.map((trader, index) => {
               const isLeader = index === 0;
-              const aiModelColor = trader.ai_model === 'qwen' ? '#c084fc' : '#60a5fa';
+              const traderColor = getTraderColor(sortedTraders, trader.trader_id);
 
               return (
                 <div
@@ -128,7 +129,7 @@ export function CompetitionPage() {
                       </div>
                       <div>
                         <div className="font-bold text-sm" style={{ color: '#EAECEF' }}>{trader.trader_name}</div>
-                        <div className="text-xs mono font-semibold" style={{ color: aiModelColor }}>
+                        <div className="text-xs mono font-semibold" style={{ color: traderColor }}>
                           {trader.ai_model.toUpperCase()}
                         </div>
                       </div>
@@ -223,7 +224,7 @@ export function CompetitionPage() {
                   <div className="text-center">
                     <div
                       className="text-base font-bold mb-2"
-                      style={{ color: trader.ai_model === 'qwen' ? '#c084fc' : '#60a5fa' }}
+                      style={{ color: getTraderColor(sortedTraders, trader.trader_id) }}
                     >
                       {trader.trader_name}
                     </div>

web/src/utils/traderColors.ts

@@ -0,0 +1,31 @@
+// Trader颜色配置 - 统一的颜色分配逻辑
+// 用于 ComparisonChart 和 Leaderboard，确保颜色一致性
+
+export const TRADER_COLORS = [
+  '#60a5fa', // blue-400
+  '#c084fc', // purple-400
+  '#34d399', // emerald-400
+  '#fb923c', // orange-400
+  '#f472b6', // pink-400
+  '#fbbf24', // amber-400
+  '#38bdf8', // sky-400
+  '#a78bfa', // violet-400
+  '#4ade80', // green-400
+  '#fb7185', // rose-400
+];
+
+/**
+ * 根据trader的索引位置获取颜色
+ * @param traders - trader列表
+ * @param traderId - 当前trader的ID
+ * @returns 对应的颜色值
+ */
+export function getTraderColor(
+  traders: Array<{ trader_id: string }>,
+  traderId: string
+): string {
+  const traderIndex = traders.findIndex((t) => t.trader_id === traderId);
+  if (traderIndex === -1) return TRADER_COLORS[0]; // 默认返回第一个颜色
+  // 如果超出颜色池大小，循环使用
+  return TRADER_COLORS[traderIndex % TRADER_COLORS.length];
+}