feat(ui): 迁移液态玻璃质感（TabBar/返回按钮）

- 自定义 TabBar 增加弯月面聚光带与银丝边缘，玻璃参数升级
- 全局返回按钮与 ScrollTopMask 返回按钮升级 135° 液态玻璃渐变
- 激活态升级为玻璃透镜，浅色/深色主题同步
- 新增 tools/liquid-glass.test.mjs 回归断言
- 同步构建产物 dist/，并合并此前未提交的 .claude 配置与 dist 变更

src/app.scss

@@ -209,19 +209,39 @@ page {
   align-items: center !important;
   justify-content: center !important;
   border-radius: 50% !important;
-  background: rgba(255, 255, 255, 0.55) !important;
-  backdrop-filter: blur(32px) saturate(1.2) !important;
-  -webkit-backdrop-filter: blur(32px) saturate(1.2) !important;
-  border: 1rpx solid rgba(255, 255, 255, 0.55) !important;
-  box-shadow: 0 12rpx 40rpx rgba(0, 0, 0, 0.18), 0 4rpx 12rpx rgba(0, 0, 0, 0.08) !important;
+  background: linear-gradient(
+    135deg,
+    rgba(255, 255, 255, 0.55) 0%,
+    rgba(255, 255, 255, 0.28) 45%,
+    rgba(255, 255, 255, 0.42) 100%
+  ) !important;
+  backdrop-filter: blur(24px) saturate(1.7) brightness(1.05) !important;
+  -webkit-backdrop-filter: blur(24px) saturate(1.7) brightness(1.05) !important;
+  border: 1rpx solid rgba(255, 255, 255, 0.35) !important;
+  box-shadow:
+    inset 0 2rpx 3rpx rgba(255, 255, 255, 0.65),
+    inset 0 -2rpx 4rpx rgba(0, 0, 0, 0.06),
+    inset 0 0 0 1rpx rgba(255, 255, 255, 0.18),
+    0 12rpx 40rpx rgba(0, 0, 0, 0.18),
+    0 4rpx 12rpx rgba(0, 0, 0, 0.08) !important;
 }
 
 .theme-dark .back-btn,
 .theme-dark .edit-back,
 .theme-dark .shop-back-btn {
-  background: rgba(25, 25, 25, 0.55) !important;
-  border-color: rgba(255, 255, 255, 0.14) !important;
-  box-shadow: 0 12rpx 40rpx rgba(0, 0, 0, 0.5), 0 4rpx 12rpx rgba(0, 0, 0, 0.3) !important;
+  background: linear-gradient(
+    135deg,
+    rgba(255, 255, 255, 0.16) 0%,
+    rgba(255, 255, 255, 0.06) 45%,
+    rgba(255, 255, 255, 0.12) 100%
+  ) !important;
+  border-color: rgba(255, 255, 255, 0.18) !important;
+  box-shadow:
+    inset 0 2rpx 3rpx rgba(255, 255, 255, 0.22),
+    inset 0 -2rpx 4rpx rgba(0, 0, 0, 0.28),
+    inset 0 0 0 1rpx rgba(255, 255, 255, 0.1),
+    0 12rpx 40rpx rgba(0, 0, 0, 0.5),
+    0 4rpx 12rpx rgba(0, 0, 0, 0.3) !important;
 }
 
 /* ==========================================================

src/components/ScrollTopMask/index.scss

@@ -44,17 +44,37 @@
   justify-content: center;
   border-radius: 50%;
   pointer-events: auto;
-  background: rgba(255, 255, 255, 0.55);
-  backdrop-filter: blur(32px) saturate(1.2);
-  -webkit-backdrop-filter: blur(32px) saturate(1.2);
-  border: 1rpx solid rgba(255, 255, 255, 0.55);
-  box-shadow: 0 12rpx 40rpx rgba(0, 0, 0, 0.18), 0 4rpx 12rpx rgba(0, 0, 0, 0.08);
+  background: linear-gradient(
+    135deg,
+    rgba(255, 255, 255, 0.55) 0%,
+    rgba(255, 255, 255, 0.28) 45%,
+    rgba(255, 255, 255, 0.42) 100%
+  );
+  backdrop-filter: blur(24px) saturate(1.7) brightness(1.05);
+  -webkit-backdrop-filter: blur(24px) saturate(1.7) brightness(1.05);
+  border: 1rpx solid rgba(255, 255, 255, 0.35);
+  box-shadow:
+    inset 0 2rpx 3rpx rgba(255, 255, 255, 0.65),
+    inset 0 -2rpx 4rpx rgba(0, 0, 0, 0.06),
+    inset 0 0 0 1rpx rgba(255, 255, 255, 0.18),
+    0 12rpx 40rpx rgba(0, 0, 0, 0.18),
+    0 4rpx 12rpx rgba(0, 0, 0, 0.08);
 }
 
 .theme-dark .scroll-top-back {
-  background: rgba(25, 25, 25, 0.55);
-  border-color: rgba(255, 255, 255, 0.14);
-  box-shadow: 0 12rpx 40rpx rgba(0, 0, 0, 0.5), 0 4rpx 12rpx rgba(0, 0, 0, 0.3);
+  background: linear-gradient(
+    135deg,
+    rgba(255, 255, 255, 0.16) 0%,
+    rgba(255, 255, 255, 0.06) 45%,
+    rgba(255, 255, 255, 0.12) 100%
+  );
+  border-color: rgba(255, 255, 255, 0.18);
+  box-shadow:
+    inset 0 2rpx 3rpx rgba(255, 255, 255, 0.22),
+    inset 0 -2rpx 4rpx rgba(0, 0, 0, 0.28),
+    inset 0 0 0 1rpx rgba(255, 255, 255, 0.1),
+    0 12rpx 40rpx rgba(0, 0, 0, 0.5),
+    0 4rpx 12rpx rgba(0, 0, 0, 0.3);
 }
 
 .scroll-top-back-arrow {

src/custom-tab-bar/index.scss

@@ -32,25 +32,84 @@
   border-radius: 64rpx;
   height: 116rpx;
   box-sizing: border-box;
-  background: rgba(255, 255, 255, 0.55);
-  backdrop-filter: blur(32px) saturate(1.2);
-  -webkit-backdrop-filter: blur(32px) saturate(1.2);
+  overflow: hidden;
+  background: rgba(255, 255, 255, 0.4);
+  backdrop-filter: blur(32px) saturate(1.7) brightness(1.05);
+  -webkit-backdrop-filter: blur(32px) saturate(1.7) brightness(1.05);
   display: flex;
   justify-content: space-around;
   align-items: center;
-  border: 1rpx solid rgba(255, 255, 255, 0.55);
-  box-shadow: 0 12rpx 40rpx rgba(0, 0, 0, 0.18), 0 4rpx 12rpx rgba(0, 0, 0, 0.08);
+  border: 1rpx solid rgba(255, 255, 255, 0.14);
+  box-shadow:
+    0 24rpx 60rpx rgba(20, 14, 10, 0.22),
+    0 4rpx 12rpx rgba(0, 0, 0, 0.08),
+    inset 0 2rpx 0 rgba(255, 255, 255, 0.35);
   pointer-events: auto;
   z-index: 1000;
 }
 
 /* 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, 0.55);
-  backdrop-filter: blur(32px) saturate(1.2);
-  -webkit-backdrop-filter: blur(32px) saturate(1.2);
-  border-color: rgba(255, 255, 255, 0.14);
-  box-shadow: 0 12rpx 40rpx rgba(0, 0, 0, 0.5), 0 4rpx 12rpx rgba(0, 0, 0, 0.3);
+  background: rgba(25, 25, 25, 0.4);
+  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);
+  box-shadow:
+    0 24rpx 60rpx rgba(0, 0, 0, 0.55),
+    0 4rpx 12rpx rgba(0, 0, 0, 0.3),
+    inset 0 2rpx 0 rgba(255, 255, 255, 0.12);
+}
+
+/* 顶部弯月面聚光带 */
+.tab-bar-caustic {
+  position: absolute;
+  top: 0;
+  left: 0;
+  right: 0;
+  height: 56rpx;
+  border-radius: 64rpx 64rpx 0 0;
+  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.32), rgba(255, 255, 255, 0));
+  box-shadow: inset 0 1rpx 0 rgba(255, 255, 255, 0.55);
+  pointer-events: none;
+  z-index: 2;
+}
+
+.custom-tab-bar.theme-dark .tab-bar-caustic {
+  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0));
+  box-shadow: inset 0 1rpx 0 rgba(255, 255, 255, 0.22);
+}
+
+/* 非均匀银丝玻璃边缘 */
+.tab-bar-rim {
+  position: absolute;
+  top: 0;
+  right: 0;
+  bottom: 0;
+  left: 0;
+  border-radius: inherit;
+  padding: 1rpx;
+  background: linear-gradient(
+    135deg,
+    rgba(255, 255, 255, 0.6) 0%,
+    rgba(255, 255, 255, 0.18) 32%,
+    rgba(255, 255, 255, 0.03) 68%,
+    rgba(255, 255, 255, 0.24) 100%
+  );
+  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
+  -webkit-mask-composite: xor;
+  mask-composite: exclude;
+  pointer-events: none;
+  z-index: 3;
+}
+
+.custom-tab-bar.theme-dark .tab-bar-rim {
+  background: linear-gradient(
+    135deg,
+    rgba(255, 255, 255, 0.34) 0%,
+    rgba(255, 255, 255, 0.12) 32%,
+    rgba(255, 255, 255, 0.02) 68%,
+    rgba(255, 255, 255, 0.16) 100%
+  );
 }
 
 .tab-item {
@@ -63,6 +122,7 @@
   flex: 1;
   height: 100%;
   max-width: 160px;
+  z-index: 10;
 }
 
 .tab-indicator {
@@ -73,13 +133,21 @@
   width: 120rpx;
   height: 100rpx;
   border-radius: 50rpx;
-  background: rgba(0, 0, 0, 0.14);
-  box-shadow: 0 0 6rpx rgba(0, 0, 0, 0.07);
+  background: linear-gradient(180deg, rgba(0, 0, 0, 0.1), rgba(0, 0, 0, 0.16));
+  border: 1rpx solid rgba(255, 255, 255, 0.25);
+  box-shadow:
+    inset 0 2rpx 4rpx rgba(255, 255, 255, 0.35),
+    inset 0 -2rpx 4rpx rgba(0, 0, 0, 0.06),
+    0 4rpx 10rpx rgba(0, 0, 0, 0.08);
 }
 
 .custom-tab-bar.theme-dark .tab-indicator {
-  background: rgba(255, 255, 255, 0.14);
-  box-shadow: 0 0 6rpx rgba(255, 255, 255, 0.07);
+  background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.16));
+  border-color: rgba(255, 255, 255, 0.18);
+  box-shadow:
+    inset 0 2rpx 4rpx rgba(255, 255, 255, 0.12),
+    inset 0 -2rpx 4rpx rgba(0, 0, 0, 0.3),
+    0 4rpx 10rpx rgba(0, 0, 0, 0.2);
 }
 
 .tab-icon-img {

src/custom-tab-bar/index.tsx

@@ -95,6 +95,8 @@ export default function CustomTabBar() {
     <View className={`tab-bar-root theme-${resolvedTheme}`}>
       <View className='tab-bar-gradient' />
       <View className={`custom-tab-bar theme-${resolvedTheme}`}>
+        <View className='tab-bar-caustic' />
+        <View className='tab-bar-rim' />
         {TABS.map((tab) => {
           const isActive = tab.pagePath === activeTab
           return (