fix: improve promotion tabs and referral layout

assets/css/routes/user-center/revenue-earnings.css

@@ -189,6 +189,7 @@
 
 /* 三 Tab 推广收益：佣金详细页采用紧凑的一列信息清单。 */
 .uc-content .uc-reward-area { display: grid; gap: 18px; padding: 24px 28px 30px; border-radius: 18px; background: var(--surface-1, #fff); box-shadow: 0 8px 26px rgba(15, 23, 42, .06); }
+.uc-content .uc-commission-summary + .uc-reward-area { margin-top: 28px; }
 .uc-content .uc-reward-area__heading { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
 .uc-content .uc-reward-area__heading h3 { margin: 0; font-size: 20px; }
 .uc-content .uc-reward-area__heading > span { color: var(--color-ink-4); font-size: 13px; }
@@ -371,6 +372,7 @@
   }
 
   .uc-content .uc-reward-area { padding: 20px 16px 24px; }
+  .uc-content .uc-commission-summary + .uc-reward-area { margin-top: 20px; }
   .uc-content .uc-reward-area__heading { display: grid; gap: 4px; }
   .uc-content .uc-reward-tabs { gap: 16px; overflow-x: auto; }
   .uc-content .uc-revenue-summary-row { grid-template-columns: 92px minmax(0, 1fr) auto; gap: 8px; }