优化交易分类选择逻辑，调整条件判断并移除高亮样式

Web/src/components/TransactionDetail.vue

@@ -256,7 +256,7 @@ const onSubmit = async () => {
 const selectClassify = (classify) => {
   editForm.classify = classify
 
-  if(editForm.id > 0 && editForm.type > 0) {
+  if(editForm.id > 0 && editForm.type >= 0) {
     // 直接保存
     onSubmit()
   }

Web/src/views/StatisticsView.vue

@@ -100,7 +100,6 @@
               v-for="(category) in expenseCategoriesView" 
               :key="category.classify"
               class="category-item clickable"
-              :class="{ 'highlighted': category._highlighted }"
               @click="goToCategoryBills(category.classify, 0)"
             >
               <div class="category-info">
@@ -137,7 +136,6 @@
               v-for="category in incomeCategoriesView" 
               :key="category.classify"
               class="category-item clickable"
-              :class="{ 'highlighted': category._highlighted }"
               @click="goToCategoryBills(category.classify, 1)"
             >
               <div class="category-info">
@@ -168,7 +166,6 @@
               v-for="category in noneCategoriesView" 
               :key="category.classify"
               class="category-item clickable"
-              :class="{ 'highlighted': category._highlighted }"
               @click="goToCategoryBills(category.classify, 2)"
             >
               <div class="category-info">
@@ -377,7 +374,6 @@ const expenseCategoriesView = computed(() => {
   const unclassifiedIndex = sorted.findIndex(c => !c.classify)
   if (unclassifiedIndex !== -1) {
     const [unclassified] = sorted.splice(unclassifiedIndex, 1)
-    unclassified._highlighted = true
     sorted.unshift(unclassified)
   }
   return sorted
@@ -388,7 +384,6 @@ const incomeCategoriesView = computed(() => {
   const unclassifiedIndex = sorted.findIndex(c => !c.classify)
   if (unclassifiedIndex !== -1) {
     const [unclassified] = sorted.splice(unclassifiedIndex, 1)
-    unclassified._highlighted = true
     sorted.unshift(unclassified)
   }
   return sorted
@@ -399,7 +394,6 @@ const noneCategoriesView = computed(() => {
   const unclassifiedIndex = sorted.findIndex(c => !c.classify)
   if (unclassifiedIndex !== -1) {
     const [unclassified] = sorted.splice(unclassifiedIndex, 1)
-    unclassified._highlighted = true
     sorted.unshift(unclassified)
   }
   return sorted
@@ -1102,13 +1096,6 @@ onBeforeUnmount(() => {
   background-color: #ff6b6b;
 }
 
-.category-item.highlighted {
-  background-color: var(--van-primary-color);
-  opacity: 0.1;
-  border-left: 3px solid var(--van-primary-color);
-  padding-left: 9px;
-}
-
 /* 趋势图 */
 .trend-chart {
   padding: 20px 16px;