Refactor: UI & Feature updates (Calculator, UnitConverter, Privacy, Cleanup)

codes/minipro/calculation/miniprogram/pages/about/about.json

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+{
+  "navigationBarTitleText": "关于",
+  "usingComponents": {}
+}

codes/minipro/calculation/miniprogram/pages/about/about.ts

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+Page({
+  data: {
+    version: '1.0.0'
+  },
+  
+  onShareAppMessage() {
+    return {
+      title: '道棋百宝箱 - 您的日常计算好帮手'
+    }
+  },
+
+  goToPrivacy() {
+    wx.navigateTo({
+      url: '/pages/privacy/privacy'
+    })
+  }
+});

codes/minipro/calculation/miniprogram/pages/about/about.wxml

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+<view class="container">
+  <view class="logo-section">
+    <view class="logo-placeholder">🧮</view>
+    <text class="app-name">道棋百宝箱</text>
+    <text class="version">Version {{version}}</text>
+  </view>
+
+  <view class="content-section">
+    <view class="section-title">应用简介</view>
+    <text class="description">
+      本小程序为实用生活计算工具，提供基础算术、常用单位换算、日期计算、折扣计算等完整功能。
+      
+      我们致力于为您提供便捷、纯净的日常计算服务，所有数据仅存储于本地，充分保障您的隐私安全。
+    </text>
+  </view>
+
+  <view class="menu-list">
+    <view class="menu-item" bindtap="goToPrivacy">
+      <text>隐私政策</text>
+      <text class="arrow">></text>
+    </view>
+  </view>
+
+  <view class="footer">
+    <text class="copyright">© 2024 道棋百宝箱</text>
+  </view>
+</view>

codes/minipro/calculation/miniprogram/pages/about/about.wxss

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+page {
+  background-color: #EBF4F8; /* Color 03 */
+}
+
+.container {
+  padding: 40rpx;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+}
+
+.logo-section {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  margin-bottom: 60rpx;
+  margin-top: 40rpx;
+}
+
+.logo-placeholder {
+  font-size: 100rpx;
+  margin-bottom: 20rpx;
+  background-color: #fff;
+  width: 160rpx;
+  height: 160rpx;
+  line-height: 160rpx;
+  text-align: center;
+  border-radius: 40rpx;
+  box-shadow: 0 4rpx 12rpx rgba(17, 97, 107, 0.1);
+  color: #11616B;
+}
+
+.app-name {
+  font-size: 40rpx;
+  font-weight: bold;
+  color: #11616B; /* Color 01 */
+  margin-bottom: 10rpx;
+}
+
+.version {
+  font-size: 24rpx;
+  color: #7BBDB6; /* Color 02 */
+}
+
+.content-section {
+  width: 100%;
+  background-color: #fff;
+  padding: 40rpx;
+  border-radius: 20rpx;
+  margin-bottom: 30rpx;
+  box-sizing: border-box;
+  box-shadow: 0 4rpx 12rpx rgba(17, 97, 107, 0.05);
+}
+
+.section-title {
+  font-size: 30rpx;
+  font-weight: bold;
+  margin-bottom: 20rpx;
+  color: #11616B; /* Color 01 */
+}
+
+.description {
+  font-size: 28rpx;
+  color: #555; /* Neutral Dark */
+  line-height: 1.8;
+}
+
+.menu-list {
+  width: 100%;
+  background-color: #fff;
+  border-radius: 20rpx;
+  overflow: hidden;
+  box-shadow: 0 4rpx 12rpx rgba(17, 97, 107, 0.05);
+}
+
+.menu-item {
+  display: flex;
+  justify-content: space-between;
+  padding: 30rpx 40rpx;
+  font-size: 30rpx;
+  color: #11616B; /* Color 01 */
+}
+
+.menu-item:active {
+  background-color: #f0f0f0;
+}
+
+.arrow {
+  color: #7BBDB6; /* Color 02 */
+}
+
+.footer {
+  margin-top: 60rpx;
+}
+
+.copyright {
+  font-size: 22rpx;
+  color: #7BBDB6; /* Color 02 */
+}