收口前端平台组件库能力

新增 PlatformUiKit 通用弹窗、按钮、状态、空态、媒体、表单和标签等公共组件
迁移结果页、创作工作台、认证入口、RPG 暗色面板和运行态弹窗的重复 UI chrome
补充组件测试、页面回归测试、技术文档和 Hermes 共享决策记录

src/components/common/PlatformActionButton.tsx

@@ -0,0 +1,95 @@
+import type {
+  ButtonHTMLAttributes,
+  LabelHTMLAttributes,
+  ReactNode,
+} from 'react';
+
+import {
+  getPlatformActionButtonClassName,
+  type PlatformActionButtonAlign,
+  type PlatformActionButtonShape,
+  type PlatformActionButtonSize,
+  type PlatformActionButtonSurface,
+  type PlatformActionButtonTone,
+} from './platformActionButtonModel';
+
+type PlatformActionButtonBaseProps = {
+  children: ReactNode;
+  tone?: PlatformActionButtonTone;
+  surface?: PlatformActionButtonSurface;
+  size?: PlatformActionButtonSize;
+  shape?: PlatformActionButtonShape;
+  align?: PlatformActionButtonAlign;
+  fullWidth?: boolean;
+};
+
+type PlatformActionButtonButtonProps = Omit<
+  ButtonHTMLAttributes<HTMLButtonElement>,
+  'children'
+> &
+  PlatformActionButtonBaseProps & {
+    asChild?: false;
+  };
+
+type PlatformActionButtonLabelProps = Omit<
+  LabelHTMLAttributes<HTMLLabelElement>,
+  'children'
+> &
+  PlatformActionButtonBaseProps & {
+    asChild: 'label';
+  };
+
+type PlatformActionButtonProps =
+  | PlatformActionButtonButtonProps
+  | PlatformActionButtonLabelProps;
+
+/**
+ * 平台通用动作按钮。
+ * 收口平台与个人中心主动作按钮的样式族、尺寸、圆角和禁用态 class。
+ */
+export function PlatformActionButton({
+  children,
+  tone = 'primary',
+  surface = 'platform',
+  size = 'sm',
+  shape = 'default',
+  align = 'center',
+  fullWidth = false,
+  className,
+  asChild,
+  ...buttonProps
+}: PlatformActionButtonProps) {
+  const actionClassName = [
+    getPlatformActionButtonClassName({
+      surface,
+      tone,
+      size,
+      shape,
+      align,
+      fullWidth,
+    }),
+    className,
+  ]
+    .filter(Boolean)
+    .join(' ');
+
+  if (asChild === 'label') {
+    return (
+      <label
+        {...(buttonProps as LabelHTMLAttributes<HTMLLabelElement>)}
+        className={actionClassName}
+      >
+        {children}
+      </label>
+    );
+  }
+
+  const { type = 'button', ...restButtonProps } =
+    buttonProps as ButtonHTMLAttributes<HTMLButtonElement>;
+
+  return (
+    <button {...restButtonProps} type={type} className={actionClassName}>
+      {children}
+    </button>
+  );
+}