优化首页用户信息更多操作按钮的可见性

- 增大按钮尺寸（28px → 32px）
- 添加默认背景色，使按钮更加明显
- 增大图标尺寸和加深颜色
- 添加缩放交互效果
- 移动端适配优化

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

web/src/pages/Home.module.less

@@ -165,25 +165,28 @@
       display: flex;
       align-items: center;
       justify-content: center;
-      width: 28px;
-      height: 28px;
+      width: 32px;
+      height: 32px;
       border-radius: 50%;
-      background: transparent;
+      background: #f5f5f5;
       cursor: pointer;
       transition: all 0.2s ease;
       flex-shrink: 0;
 
       &:hover {
-        background: #f5f5f5;
+        background: #e8e8e8;
+        transform: scale(1.05);
       }
 
       &:active {
-        background: #e8e8e8;
+        background: #d9d9d9;
+        transform: scale(0.95);
       }
 
       .dropdownIcon {
-        font-size: 12px;
-        color: #8c8c8c;
+        font-size: 18px;
+        color: #595959;
+        font-weight: 600;
       }
     }
 
@@ -545,11 +548,11 @@
       }
 
       .dropdownTrigger {
-        width: 24px;
-        height: 24px;
+        width: 28px;
+        height: 28px;
 
         .dropdownIcon {
-          font-size: 11px;
+          font-size: 16px;
         }
       }