style(ui): 底栏透明度从 0.4 降至 0.32

src/custom-tab-bar/index.scss

@@ -33,7 +33,7 @@
   height: 116rpx;
   box-sizing: border-box;
   overflow: hidden;
-  background: rgba(255, 255, 255, 0.4);
+  background: rgba(255, 255, 255, 0.32);
   backdrop-filter: blur(32px) saturate(1.7) brightness(1.05);
   -webkit-backdrop-filter: blur(32px) saturate(1.7) brightness(1.05);
   display: flex;
@@ -50,7 +50,7 @@
 
 /* 自定义组件样式隔离：两套主题配色在组件内自包含，不依赖全局 app.wxss */
 .custom-tab-bar.theme-dark {
-  background: rgba(25, 25, 25, 0.4);
+  background: rgba(25, 25, 25, 0.32);
   backdrop-filter: blur(32px) saturate(1.7) brightness(1.05);
   -webkit-backdrop-filter: blur(32px) saturate(1.7) brightness(1.05);
   border-color: rgba(255, 255, 255, 0.1);