fix: 交易时间支持时分秒选择

- 添加时间选择器 (picker mode="time")
- 新增 transactionTime 字段
- 新增 getCurrentTime() 和 onTimeChange()
- 修复交易记录时间格式显示

pages/detail/detail.vue

@@ -425,12 +425,20 @@
           
           <view class="form-item">
             <text class="form-label">交易时间</text>
-            <picker mode="date" :value="transactionForm.transactionDate" @change="onDateChange">
+            <view class="flex-row gap-2">
+              <picker mode="date" :value="transactionForm.transactionDate" @change="onDateChange" class="flex-1">
                 <view class="form-select">
                   <text>{{ transactionForm.transactionDate || '请选择日期' }}</text>
                   <uni-icons type="bottom" size="14" color="#9CA3AF"></uni-icons>
                 </view>
               </picker>
+              <picker mode="time" :value="transactionForm.transactionTime" @change="onTimeChange" class="flex-1">
+                <view class="form-select">
+                  <text>{{ transactionForm.transactionTime || '请选择时间' }}</text>
+                  <uni-icons type="bottom" size="14" color="#9CA3AF"></uni-icons>
+                </view>
+              </picker>
+            </view>
           </view>
           
           <view class="form-item">
@@ -777,12 +785,20 @@ const getCurrentDate = (): string => {
   return `${year}-${month}-${day}`;
 };
 
+const getCurrentTime = (): string => {
+  const now = new Date();
+  const hours = String(now.getHours()).padStart(2, '0');
+  const minutes = String(now.getMinutes()).padStart(2, '0');
+  return `${hours}:${minutes}`;
+};
+
 const transactionForm = ref<any>({
   stockCode: '',
   amount: '',
   price: '',
   currency: '',
   transactionDate: getCurrentDate(),
+  transactionTime: getCurrentTime(),
   dateTimestamp: Date.now(),
   remark: ''
 });
@@ -1114,6 +1130,7 @@ const resetTransactionForm = () => {
     price: '',
     currency: 'CNY',
     transactionDate: getCurrentDate(),
+    transactionTime: getCurrentTime(),
     dateTimestamp: Date.now(),
     remark: ''
   };
@@ -1127,6 +1144,10 @@ const onDateChange = (e) => {
   transactionForm.value.dateTimestamp = new Date(e.detail.value).getTime();
 };
 
+const onTimeChange = (e) => {
+  transactionForm.value.transactionTime = e.detail.value;
+};
+
 const submitTransaction = async () => {
   // 表单验证
   if (!transactionForm.value.stockCode) {
@@ -1172,6 +1193,7 @@ const submitTransaction = async () => {
     price: parseFloat(transactionForm.value.price),
     currency: transactionForm.value.currency,
     transactionDate: transactionForm.value.transactionDate,
+    transactionTime: transactionForm.value.transactionTime,
     remark: transactionForm.value.remark
   };