feat: 新增 DailyInsightCard 组件，用于展示每日消费洞察并集成AI分析功能。

src/components/home/DailyInsightCard/DailyInsightCard.tsx

@@ -154,29 +154,7 @@ export const DailyInsightCard: React.FC<DailyInsightCardProps> = ({
           <p className="daily-insight__text animate-fade-in">{spendingInsight.text}</p>
         </div>
 
-        {/* 7-Day Trend Chart */}
-        {last7DaysSpend && last7DaysSpend.length > 0 && (
-          <div className="daily-insight__section">
-            <span className="daily-insight__title">近7天趋势</span>
-            <div className="trend-chart">
-              {last7DaysSpend.map((amount, index) => {
-                const maxVal = Math.max(...last7DaysSpend, 1);
-                const heightPercent = Math.max((amount / maxVal) * 100, 10); // Min 10% height
-                const isToday = index === last7DaysSpend.length - 1;
-                const isMax = amount === maxVal && amount > 0;
 
-                return (
-                  <div key={index} className="trend-bar-wrapper" title={`Day ${index - 6}: ¥${amount}`}>
-                    <div
-                      className={`trend-bar ${isToday ? 'trend-bar--today' : ''} ${isMax ? 'trend-bar--max' : ''}`}
-                      style={{ height: `${heightPercent}%` }}
-                    />
-                  </div>
-                );
-              })}
-            </div>
-          </div>
-        )}
 
         <div className="daily-insight__divider" />