Fix/统一修复modal样式失效 (#122)

之前遇到几次弹窗的样式不生效,bug 现在在画布agent的删除对话弹窗又出现了,
这个pr把类似的修改集中到最下层的UnifiedModal,适用于所有的modal,
一些特殊的modal有特殊处理.

画布agent的删除对话弹窗
![shotmd-1785399342.jpg](/attachments/d63d7dc6-bf7e-4f13-bfe8-bc4716cd798f)

---------

Co-authored-by: 段舒康 <kdletters@qq.com>
Reviewed-on: http://192.168.35.82/git/GenarrativeAI/Genarrative/pulls/122
Reviewed-by: 段舒康 <kdletters@qq.com>
Co-authored-by: 王德宇 <kvtodev@outlook.com>
Co-committed-by: 王德宇 <kvtodev@outlook.com>

src/components/common/PlatformToolModalShell.tsx

@@ -1,6 +1,5 @@
 import type { ReactNode } from 'react';
 
-import { useAuthUi } from '../auth/AuthUiContext';
 import { UnifiedModal } from './UnifiedModal';
 
 type PlatformToolModalShellProps = {
@@ -50,9 +49,6 @@ export function PlatformToolModalShell({
   bodyClassName,
   footerClassName,
 }: PlatformToolModalShellProps) {
-  const resolvedPlatformTheme =
-    useAuthUi()?.platformTheme ?? 'light';
-
   return (
     <UnifiedModal
       open={open}
@@ -68,7 +64,6 @@ export function PlatformToolModalShell({
       closeOnBackdrop={closeOnBackdrop}
       closeOnEscape={closeOnEscape}
       zIndexClassName={zIndexClassName}
-      overlayClassName={`platform-theme platform-theme--${resolvedPlatformTheme}`}
       panelClassName={joinClassNames(
         'platform-remap-surface shadow-[0_24px_80px_rgba(0,0,0,0.55)]',
         panelClassName,