继续补齐个人中心弹窗底部插槽

扩展 PlatformProfileModalShell 透传共享 footer 插槽能力
将昵称修改弹窗改为使用标准 profile modal footer
补充 modal shell 与昵称弹窗的 footer 接法回归测试
更新 PlatformUiKit 收口计划与共享决策记录

src/components/platform-entry/PlatformProfileModalShell.tsx

@@ -8,6 +8,7 @@ type PlatformProfileModalShellProps = {
   description?: ReactNode;
   onClose: () => void;
   children: ReactNode;
+  footer?: ReactNode;
   closeLabel?: string;
   closeVariant?: 'profile' | 'profileCompact';
   closeDisabled?: boolean;
@@ -18,6 +19,7 @@ type PlatformProfileModalShellProps = {
   panelClassName: string;
   bodyClassName?: string;
   descriptionClassName?: string;
+  footerClassName?: string;
 };
 
 type PlatformProfileSecondaryModalShellProps = {
@@ -56,6 +58,7 @@ export function PlatformProfileModalShell({
   description,
   onClose,
   children,
+  footer,
   closeLabel,
   closeVariant = 'profile',
   closeDisabled = false,
@@ -66,6 +69,7 @@ export function PlatformProfileModalShell({
   panelClassName,
   bodyClassName = 'px-5 py-5',
   descriptionClassName = PROFILE_MODAL_DESCRIPTION_CLASS,
+  footerClassName,
 }: PlatformProfileModalShellProps) {
   return (
     <UnifiedModal
@@ -89,6 +93,8 @@ export function PlatformProfileModalShell({
       titleClassName={PROFILE_MODAL_TITLE_CLASS}
       descriptionClassName={descriptionClassName}
       bodyClassName={bodyClassName}
+      footer={footer}
+      footerClassName={footerClassName}
     >
       {children}
     </UnifiedModal>