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/components/SaveSuccess/SaveSuccess.vue

@@ -0,0 +1,85 @@
+<template>
+  <view class="save-success" v-if="visible" @tap="hide">
+    <view class="success-icon" :class="{ show: animating }">
+      <SvgIcon name="check" :size="80" color="#FFFFFF" />
+    </view>
+    <text class="success-text" :class="{ show: animating }">{{ text }}</text>
+  </view>
+</template>
+
+<script setup lang="ts">
+import { ref, watch } from 'vue'
+import SvgIcon from '@/components/SvgIcon/SvgIcon.vue'
+
+const props = withDefaults(defineProps<{
+  visible: boolean
+  text?: string
+}>(), { text: '保存成功' })
+
+const emit = defineEmits(['update:visible'])
+
+const animating = ref(false)
+
+watch(() => props.visible, (val) => {
+  if (val) {
+    setTimeout(() => { animating.value = true }, 50)
+    setTimeout(() => { hide() }, 2000)
+  } else {
+    animating.value = false
+  }
+})
+
+function hide() {
+  animating.value = false
+  setTimeout(() => { emit('update:visible', false) }, 300)
+}
+</script>
+
+<style lang="scss" scoped>
+.save-success {
+  position: fixed;
+  top: 0;
+  left: 0;
+  right: 0;
+  bottom: 0;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  background: rgba(0, 0, 0, 0.5);
+  z-index: 9999;
+}
+
+.success-icon {
+  width: 160rpx;
+  height: 160rpx;
+  border-radius: 50%;
+  background: linear-gradient(135deg, #7BC67E, #5BA85E);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  transform: scale(0);
+  opacity: 0;
+  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
+
+  &.show {
+    transform: scale(1);
+    opacity: 1;
+  }
+}
+
+.success-text {
+  font-size: 32rpx;
+  font-weight: 600;
+  color: #FFFFFF;
+  margin-top: 24rpx;
+  transform: translateY(20rpx);
+  opacity: 0;
+  transition: all 0.3s ease 0.2s;
+
+  &.show {
+    transform: translateY(0);
+    opacity: 1;
+  }
+}
+</style>