feat: 添加交易时间选择框，支持手动选择交易日期

pages/detail/detail.vue

@@ -214,6 +214,16 @@
             </picker>
           </view>
           
+          <view class="form-item">
+            <text class="form-label">交易时间</text>
+            <picker mode="date" @change="onDateChange" :value="transactionForm.transactionDate">
+              <view class="form-select">
+                <text>{{ transactionForm.transactionDate }}</text>
+                <uni-icons type="bottom" size="14" color="#9CA3AF"></uni-icons>
+              </view>
+            </picker>
+          </view>
+          
           <view class="form-item">
             <text class="form-label">备注</text>
             <input 
@@ -264,11 +274,21 @@ const logs = ref([]);
 // 交易表单
 const showTransactionForm = ref(false);
 const transactionType = ref('buy'); // buy 或 sell
+// 获取当前日期格式化为YYYY-MM-DD
+const getCurrentDate = () => {
+  const now = new Date();
+  const year = now.getFullYear();
+  const month = String(now.getMonth() + 1).padStart(2, '0');
+  const day = String(now.getDate()).padStart(2, '0');
+  return `${year}-${month}-${day}`;
+};
+
 const transactionForm = ref({
   stockCode: '',
   amount: '',
   price: '',
   currency: 'CNY',
+  transactionDate: getCurrentDate(),
   remark: ''
 });
 
@@ -285,6 +305,10 @@ const onCurrencyChange = (e) => {
   transactionForm.value.currency = currencyList.value[currencyIndex.value].code;
 };
 
+const onDateChange = (e) => {
+  transactionForm.value.transactionDate = e.detail.value;
+};
+
 // 股票搜索相关
 const searchResults = ref([]);
 const searchTimer = ref(null);
@@ -398,6 +422,7 @@ const resetTransactionForm = () => {
     amount: '',
     price: '',
     currency: 'CNY',
+    transactionDate: getCurrentDate(),
     remark: ''
   };
 };
@@ -421,6 +446,7 @@ const submitTransaction = async () => {
     amount: parseFloat(transactionForm.value.amount),
     price: parseFloat(transactionForm.value.price),
     currency: transactionForm.value.currency,
+    transactionDate: transactionForm.value.transactionDate,
     remark: transactionForm.value.remark
   };