拆出个人中心剩余弹层组件

- 新增充值账单任务兑换码共享组件并补齐组件级测试
- 让 RpgEntryHomeView 改为复用新的 profile 弹层组件并删除内联实现
- 更新 PlatformUiKit 收口文档与团队共享记忆记录新的组件沉淀

src/components/platform-entry/PlatformProfileRewardCodeRedeemModal.tsx

@@ -0,0 +1,84 @@
+import { PlatformActionButton } from '../common/PlatformActionButton';
+import { PlatformStatusMessage } from '../common/PlatformStatusMessage';
+import { PlatformTextField } from '../common/PlatformTextField';
+import { PlatformProfileModalShell } from './PlatformProfileModalShell';
+
+export type PlatformProfileRewardCodeRedeemModalProps = {
+  value: string;
+  isSubmitting: boolean;
+  error: string | null;
+  success: string | null;
+  onChange: (value: string) => void;
+  onSubmit: () => void;
+  onClose: () => void;
+};
+
+/**
+ * 个人中心兑换码弹窗。
+ * 保持原有输入、回车提交、禁用态和反馈消息语义不变。
+ */
+export function PlatformProfileRewardCodeRedeemModal({
+  value,
+  isSubmitting,
+  error,
+  success,
+  onChange,
+  onSubmit,
+  onClose,
+}: PlatformProfileRewardCodeRedeemModalProps) {
+  return (
+    <PlatformProfileModalShell
+      title="兑换码"
+      onClose={onClose}
+      closeLabel="关闭兑换码"
+      panelClassName="platform-recharge-modal !max-w-sm rounded-[1.4rem]"
+      bodyClassName="space-y-3 px-5 py-5"
+    >
+      <PlatformTextField
+        value={value}
+        onChange={(event) => onChange(event.target.value)}
+        onKeyDown={(event) => {
+          if (event.key === 'Enter') {
+            onSubmit();
+          }
+        }}
+        size="sm"
+        density="roomy"
+        className="uppercase tracking-normal"
+        placeholder="输入兑换码"
+        aria-label="兑换码"
+        autoFocus
+      />
+      <PlatformActionButton
+        surface="profile"
+        fullWidth
+        size="md"
+        className="disabled:opacity-50"
+        onClick={onSubmit}
+        disabled={isSubmitting || !value.trim()}
+      >
+        {isSubmitting ? '兑换中' : '兑换'}
+      </PlatformActionButton>
+      {error ? (
+        <PlatformStatusMessage
+          tone="error"
+          surface="profile"
+          size="xs"
+          className="rounded-2xl font-semibold"
+        >
+          {error}
+        </PlatformStatusMessage>
+      ) : null}
+      {success ? (
+        <PlatformStatusMessage
+          tone="success"
+          surface="profile"
+          size="xs"
+          className="rounded-2xl font-semibold"
+        >
+          {success}
+        </PlatformStatusMessage>
+      ) : null}
+    </PlatformProfileModalShell>
+  );
+}