refactor: 整理组件目录结构

- TransactionDetail, CategoryBillPopup 移入 Transaction/
- BudgetTypeTabs 移入 Budget/
- GlassBottomNav, ModernEmpty 移入 Global/
- Icon, IconSelector, ClassifySelector 等 8 个通用组件移入 Common/
- 更新所有相关引用路径

Web/src/components/Common/PopupContainerV2.vue

@@ -0,0 +1,180 @@
+<!--
+PopupContainer V2 - 通用底部弹窗组件（采用 TransactionDetailSheet 样式风格）
+
+## 与 V1 的区别
+- V1 (PopupContainer.vue): 使用 Vant 主题变量，标准化布局，默认高度 80%
+- V2 (PopupContainerV2.vue): 使用 Inter 字体，16px 圆角，纯白背景，更现代化的视觉风格
+
+## 基础用法
+<PopupContainerV2 v-model:show="show" title="标题">
+  <div class="content">内容区域</div>
+  <template #footer>
+    <van-button type="primary">确定</van-button>
+  </template>
+</PopupContainerV2>
+
+## Props
+- show (Boolean, required): 控制弹窗显示/隐藏
+- title (String, required): 标题文本
+- height (String, default: 'auto'): 弹窗高度，支持 'auto', '80%', '500px' 等
+- maxHeight (String, default: '85%'): 最大高度
+
+## Slots
+- default: 可滚动的内容区域（不提供默认 padding，由使用方控制）
+- footer: 固定底部区域（操作按钮等）
+
+## Events
+- update:show: 弹窗显示/隐藏状态变更
+-->
+<template>
+  <van-popup
+    v-model:show="visible"
+    position="bottom"
+    :style="{
+      height: height === 'auto' ? maxHeight : height,
+      borderTopLeftRadius: '16px',
+      borderTopRightRadius: '16px'
+    }"
+    teleport="body"
+    @close="handleClose"
+  >
+    <div class="popup-container-v2">
+      <!-- 固定头部 -->
+      <div class="popup-header">
+        <h3 class="popup-title">
+          {{ title }}
+        </h3>
+        <van-icon
+          name="cross"
+          class="popup-close"
+          @click="handleClose"
+        />
+      </div>
+
+      <!-- 可滚动内容区域 -->
+      <div class="popup-content">
+        <slot />
+      </div>
+
+      <!-- 固定底部 -->
+      <div
+        v-if="hasFooter"
+        class="popup-footer"
+      >
+        <slot name="footer" />
+      </div>
+    </div>
+  </van-popup>
+</template>
+
+<script setup>
+import { computed, useSlots } from 'vue'
+
+const props = defineProps({
+  show: {
+    type: Boolean,
+    required: true
+  },
+  title: {
+    type: String,
+    required: true
+  },
+  height: {
+    type: String,
+    default: 'auto'
+  },
+  maxHeight: {
+    type: String,
+    default: '85%'
+  }
+})
+
+const emit = defineEmits(['update:show'])
+
+const slots = useSlots()
+
+// 双向绑定
+const visible = computed({
+  get: () => props.show,
+  set: (value) => emit('update:show', value)
+})
+
+// 判断是否有 footer 插槽
+const hasFooter = computed(() => !!slots.footer)
+
+// 关闭弹窗
+const handleClose = () => {
+  visible.value = false
+}
+</script>
+
+<style scoped lang="scss">
+.popup-container-v2 {
+  background: #ffffff;
+  height: 100%;
+  display: flex;
+  flex-direction: column;
+}
+
+// 固定头部
+.popup-header {
+  flex-shrink: 0;
+  padding: 24px;
+  padding-bottom: 16px;
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+
+  .popup-title {
+    font-family: Inter, sans-serif;
+    font-size: 18px;
+    font-weight: 600;
+    color: #09090b;
+    margin: 0;
+  }
+
+  .popup-close {
+    font-size: 24px;
+    color: #71717a;
+    cursor: pointer;
+    transition: opacity 0.2s;
+
+    &:active {
+      opacity: 0.7;
+    }
+  }
+}
+
+// 可滚动内容区域
+.popup-content {
+  flex: 1;
+  overflow-y: auto;
+  overflow-x: hidden;
+  -webkit-overflow-scrolling: touch;
+  // 不提供默认 padding，由使用方控制
+}
+
+// 固定底部
+.popup-footer {
+  flex-shrink: 0;
+  padding: 24px;
+  padding-top: 16px;
+}
+
+// 暗色模式
+@media (prefers-color-scheme: dark) {
+  .popup-container-v2 {
+    background: #18181b;
+  }
+
+  .popup-header {
+    .popup-title {
+      color: #fafafa;
+    }
+
+    .popup-close {
+      color: #a1a1aa;
+    }
+  }
+}
+</style>