refactor(style): 优化首页主要组件样式及布局实现

- 移除 BestSellers 组件中多余的 SCSS 样式，改用 TailwindCSS 工具类规范字体大小和颜色
- 替换 BestSellers.tsx 中对应元素的样式类为 TailwindCSS 实现，提升样式一致性和维护性
- 调整 CatalogShowcase 组件样式，删除不必要的 SCSS 样式，增加内边距并修改书本尺寸，整体优化布局
- CatalogShowcase.tsx 中相关文本和图形元素改为 TailwindCSS 实现，规范字体大小、颜色和间距
- ContactSection 组件部分样式移除过

src/pages/index/CatalogShowcase.scss

@@ -40,6 +40,7 @@
     justify-content: space-between;
     align-items: center;
     position: relative;
+    padding: 16px;
     z-index: 1;
   }
 
@@ -51,26 +52,6 @@
     padding-right: 16px;
   }
 
-  &__badge {
-    font-size: 14px;
-    font-weight: 700;
-    color: rgba(255, 255, 255, 0.5);
-    letter-spacing: 2px;
-  }
-
-  &__title {
-    font-size: 24px;
-    font-weight: 700;
-    color: #ffffff;
-    margin-bottom: 2px;
-  }
-
-  &__desc {
-    font-size: 15px;
-    color: rgba(255, 255, 255, 0.65);
-    line-height: 1.5;
-  }
-
   &__cta {
     display: inline-flex;
     align-items: center;
@@ -84,20 +65,14 @@
     border: 1px solid rgba(255, 255, 255, 0.2);
   }
 
-  &__cta-text {
-    font-size: 15px;
-    font-weight: 600;
-    color: #ffffff;
-  }
-
   /* ═══ 右侧书本图形 ═══ */
   &__right {
     flex-shrink: 0;
   }
 
   &__book {
-    width: 72px;
-    height: 90px;
+    width: 142px;
+    height: 180px;
     background: rgba(255, 255, 255, 0.12);
     border-radius: 4px 10px 10px 4px;
     display: flex;
@@ -132,13 +107,4 @@
     &:nth-child(2) { height: 40px; }
     &:nth-child(3) { height: 32px; }
   }
-
-  &__book-label {
-    position: absolute;
-    bottom: 6px;
-    right: 8px;
-    font-size: 14px;
-    font-weight: 700;
-    color: rgba(255, 255, 255, 0.4);
-  }
 }