添加新的阅读页面入口，更新自定义标签栏以使用 SVG 图标，优化分享按钮样式和布局，提升用户体验。

miniprogram/pages/read/read.json

@@ -1,5 +1,7 @@
 {
-  "usingComponents": {},
+  "usingComponents": {
+    "icon": "/components/icon/icon"
+  },
   "enablePullDownRefresh": false,
   "backgroundTextStyle": "light",
   "backgroundColor": "#000000",

miniprogram/pages/read/read.wxml

@@ -226,7 +226,6 @@
 
   <!-- 右下角悬浮分享按钮 -->
   <button class="fab-share" open-type="share">
-    <text class="fab-share-icon">↗</text>
-    <text class="fab-share-text">分享</text>
+    <image class="fab-icon" src="/assets/icons/share.svg" mode="aspectFit"></image>
   </button>
 </view>

miniprogram/pages/read/read.wxss

@@ -923,20 +923,19 @@
 .fab-share {
   position: fixed;
   right: 32rpx;
+  width:70rpx!important;
   bottom: calc(120rpx + env(safe-area-inset-bottom));
-  width: 112rpx;
-  height: 112rpx;
-  border-radius: 50%;
+  height: 70rpx;
+  border-radius: 60rpx;
   background: linear-gradient(135deg, #00CED1 0%, #20B2AA 100%);
   box-shadow: 0 8rpx 32rpx rgba(0, 206, 209, 0.4);
-  display: flex;
-  flex-direction: column;
-  align-items: center;
-  justify-content: center;
   padding: 0;
   margin: 0;
   border: none;
-  z-index: 90;
+  z-index: 9999;
+  display:flex;
+  align-items: center;
+  justify-content: center;
   transition: transform 0.2s ease, box-shadow 0.2s ease;
 }
 
@@ -949,16 +948,10 @@
   box-shadow: 0 4rpx 20rpx rgba(0, 206, 209, 0.5);
 }
 
-.fab-share-icon {
-  font-size: 40rpx;
-  color: #ffffff;
-  line-height: 1;
+.fab-icon {
+  padding:16rpx;
+  width: 50rpx;
+  height: 50rpx;
   display: block;
 }
 
-.fab-share-text {
-  font-size: 20rpx;
-  color: rgba(255, 255, 255, 0.95);
-  margin-top: 4rpx;
-  font-weight: 500;
-}