feat: 整体页面优化，删除无用svg

pages/wiki/detail/index.wxss

@@ -243,3 +243,46 @@ page {
   justify-content: center;
   background: #F4F6F0;
 }
+
+/* Header Share Button */
+.header-share-btn {
+  position: absolute;
+  top: 24rpx;
+  right: 24rpx;
+  width: 72rpx;
+  height: 72rpx;
+  background: rgba(0,0,0,0.35);
+  backdrop-filter: blur(4px);
+  border-radius: 50%;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  z-index: 20;
+  border: none;
+  padding: 0;
+  line-height: normal;
+  margin: 0;
+}
+.header-share-btn::after { border: none; }
+.header-share-btn:active {
+  transform: scale(0.9);
+  background: rgba(0,0,0,0.5);
+  transition: transform 0.1s;
+}
+
+/* Card Collect Button */
+.card-collect-btn {
+  position: absolute;
+  top: 32rpx;
+  right: 32rpx;
+  width: 80rpx;
+  height: 80rpx;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  z-index: 20;
+}
+.card-collect-btn:active {
+  transform: scale(0.9);
+  transition: transform 0.1s;
+}