Revert "fix: 弹框居中写法调整，增强兼容性"

This reverts commit 5293a32748.

app/components/PcFundTable.jsx

@@ -34,7 +34,7 @@ import {
   DialogHeader,
   DialogTitle,
 } from '@/components/ui/dialog';
-import { DragIcon, ExitIcon, SettingsIcon, StarIcon, TrashIcon, ResetIcon } from './Icons';
+import { CloseIcon, DragIcon, ExitIcon, SettingsIcon, StarIcon, TrashIcon, ResetIcon } from './Icons';
 
 const NON_FROZEN_COLUMN_IDS = [
   'yesterdayChangePercent',
@@ -1167,13 +1167,22 @@ export default function PcFundTable({
       >
         <DialogContent
           className="sm:max-w-2xl max-h-[88vh] flex flex-col p-0 overflow-hidden"
-          showCloseButton
+          showCloseButton={false}
           onPointerDownOutside={blockDialogClose ? (e) => e.preventDefault() : undefined}
         >
           <DialogHeader className="flex-shrink-0 flex flex-row items-center justify-between gap-2 space-y-0 px-6 pb-4 pt-6 text-left border-b border-[var(--border)]">
             <DialogTitle className="text-base font-semibold text-[var(--text)]">
               基金详情
             </DialogTitle>
+            <button
+              type="button"
+              className="icon-button rounded-lg"
+              aria-label="关闭"
+              onClick={() => setCardDialogRow(null)}
+              style={{ padding: 4, borderColor: 'transparent' }}
+            >
+              <CloseIcon width="20" height="20" />
+            </button>
           </DialogHeader>
           <div
             className="flex-1 min-h-0 overflow-y-auto px-6 py-4"