♻️ refactor(InvitationCard): restructure cards with title prop and clean up styling

- Move card titles (earnings, total revenue, invitations) to Card title prop for consistency
- Remove custom color classes in favor of Semi-UI's built-in type system
- Standardize Text component usage with strong and tertiary types
- Improve code maintainability and visual consistency across all cards
- Align structure with existing reward description card pattern

web/src/index.css

@@ -683,59 +683,6 @@ html.dark .with-pastel-balls::before {
   mix-blend-mode: screen;
 }
 
-/* ==================== 卡片马卡龙模糊球（温暖色系） ==================== */
-.with-pastel-balls-warm {
-  position: relative;
-  overflow: hidden;
-  /* 温暖色系变量（明亮模式） */
-  --pb1: #ffe4b5;
-  /* 桃杏 */
-  --pb2: #d4ffdd;
-  /* 薄荷绿 */
-  --pb3: #ffecb3;
-  /* 浅金 */
-  --pb4: #e8f5e8;
-  /* 淡绿 */
-  --pb-opacity: 0.55;
-}
-
-.with-pastel-balls-warm::before {
-  content: '';
-  position: absolute;
-  inset: 0;
-  pointer-events: none;
-  z-index: 0;
-  background:
-    radial-gradient(circle at -5% -10%, var(--pb1) 0%, transparent 60%),
-    radial-gradient(circle at 105% -10%, var(--pb2) 0%, transparent 55%),
-    radial-gradient(circle at 5% 110%, var(--pb3) 0%, transparent 55%),
-    radial-gradient(circle at 105% 110%, var(--pb4) 0%, transparent 50%);
-  opacity: var(--pb-opacity);
-}
-
-.with-pastel-balls-warm>* {
-  position: relative;
-  z-index: 1;
-}
-
-/* 暗黑模式下更柔和的色彩和透明度 */
-html.dark .with-pastel-balls-warm {
-  --pb1: #ffe4b5;
-  /* 桃杏 */
-  --pb2: #d4ffdd;
-  /* 薄荷绿 */
-  --pb3: #ffecb3;
-  /* 浅金 */
-  --pb4: #e8f5e8;
-  /* 淡绿 */
-  --pb-opacity: 0.36;
-}
-
-/* 暗黑模式下用更柔和的混合模式 */
-html.dark .with-pastel-balls-warm::before {
-  mix-blend-mode: screen;
-}
-
 /* ==================== 表格卡片滚动设置 ==================== */
 .table-scroll-card {
   display: flex;
@@ -814,4 +761,9 @@ html.dark .with-pastel-balls-warm::before {
   flex: 1;
   overflow: auto;
   min-height: 0;
+}
+
+/* ==================== semi-ui 组件自定义样式 ==================== */
+.semi-card-header {
+  padding: 10px !important;
 }