feat: v1.3 交互增强

新增功能：
- 账单左滑删除（替代长按，更符合移动端习惯）
- 输入震动反馈（Numpad 按键时调用 uni.vibrateShort）
- 保存成功动画（Checkmark 弹出动画）
- 分类图标滚动到选中项（编辑记录时自动定位）

组件更新：
- TransactionItem 支持左滑露出删除按钮
- Numpad 添加震动反馈
- SaveSuccess 新增保存成功动画组件

client/src/pages/add/index.vue

@@ -22,9 +22,9 @@
       <text class="digits">{{ displayAmount }}</text>
     </view>
 
-    <scroll-view class="category-scroll" scroll-y>
+    <scroll-view class="category-scroll" scroll-y :scroll-into-view="scrollToCat">
       <view class="category-grid">
-        <view v-for="cat in currentCategories" :key="cat.id" class="cat-item" @tap="selectedCat = cat.id">
+        <view v-for="cat in currentCategories" :key="cat.id" :id="'cat-' + cat.id" class="cat-item" @tap="selectedCat = cat.id">
           <CategoryIcon :label="cat.name[0]" :color="cat.color" :bg-color="cat.color + '15'" size="md" :selected="selectedCat === cat.id" />
           <text class="cat-name" :class="{ active: selectedCat === cat.id }">{{ cat.name }}</text>
         </view>
@@ -45,6 +45,8 @@
     </view>
 
     <Numpad @input="onInput" @delete="onDelete" @confirm="save" />
+
+    <SaveSuccess v-model:visible="showSuccess" :text="editId ? '修改成功' : '记账成功'" />
   </view>
 </template>
 
@@ -55,6 +57,7 @@ import { useTransactionStore } from '@/stores/transaction'
 import Numpad from '@/components/Numpad/Numpad.vue'
 import CategoryIcon from '@/components/CategoryIcon/CategoryIcon.vue'
 import SvgIcon from '@/components/SvgIcon/SvgIcon.vue'
+import SaveSuccess from '@/components/SaveSuccess/SaveSuccess.vue'
 import { statusBarHeight } from '@/utils/system'
 
 const catStore = useCategoryStore()
@@ -67,6 +70,8 @@ const note = ref('')
 const selectedDate = ref(new Date().toISOString().slice(0, 10))
 const saving = ref(false)
 const editId = ref<number | null>(null)
+const showSuccess = ref(false)
+const scrollToCat = ref('')
 const todayStr = new Date().toISOString().slice(0, 10)
 // Remember last selected category per type
 const lastCatByType: Record<string, number | null> = { expense: null, income: null }
@@ -124,6 +129,8 @@ onMounted(async () => {
       lastCatByType[existing.type] = existing.category_id
       note.value = existing.note || ''
       selectedDate.value = existing.date.slice(0, 10)
+      // Scroll to selected category
+      setTimeout(() => { scrollToCat.value = 'cat-' + existing.category_id }, 100)
     } else {
       uni.showToast({ title: '记录不存在', icon: 'none' })
       setTimeout(() => uni.navigateBack(), 1500)
@@ -188,12 +195,11 @@ async function save() {
     }
     if (editId.value) {
       await txStore.updateTransaction(editId.value, data)
-      uni.showToast({ title: '修改成功', icon: 'success' })
     } else {
       await txStore.addTransaction(data)
-      uni.showToast({ title: '记账成功', icon: 'success' })
     }
-    setTimeout(() => uni.navigateBack(), 1500)
+    showSuccess.value = true
+    setTimeout(() => uni.navigateBack(), 2500)
   } catch (e) {
     uni.showToast({ title: '保存失败', icon: 'none' })
   } finally {