存量前端：生图分组/灯箱/重生控件/导入文案/驳回横幅+SSE+总核销表

- ImageStrategyGroup/ImageLightbox/RegenControls/ImportTextModal/
  RejectReasonBanner 新建组件
- tasks images/text/new + history + 配置/布局/SSE hooks 存量改动
- 总核销表进度更新

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/components/tasks/ImageLightbox.tsx

@@ -0,0 +1,57 @@
+'use client';
+// ImageLightbox — 点击挑图卡片放大看全图（解决"只看半截"），ESC/点遮罩关闭
+import { useEffect } from 'react';
+
+interface ImageLightboxProps {
+  url: string | null;
+  caption?: string;
+  onClose: () => void;
+}
+
+export function ImageLightbox({ url, caption, onClose }: ImageLightboxProps) {
+  useEffect(() => {
+    if (!url) return;
+    const onKey = (e: KeyboardEvent) => {
+      if (e.key === 'Escape') onClose();
+    };
+    window.addEventListener('keydown', onKey);
+    // 打开时锁滚动，关闭时恢复
+    const prev = document.body.style.overflow;
+    document.body.style.overflow = 'hidden';
+    return () => {
+      window.removeEventListener('keydown', onKey);
+      document.body.style.overflow = prev;
+    };
+  }, [url, onClose]);
+
+  if (!url) return null;
+
+  return (
+    <div
+      role="dialog"
+      aria-modal="true"
+      aria-label="图片放大预览"
+      onClick={onClose}
+      className="fixed inset-0 z-50 flex items-center justify-center bg-black/80 p-4"
+    >
+      <div className="relative max-h-full max-w-3xl" onClick={(e) => e.stopPropagation()}>
+        <button
+          onClick={onClose}
+          aria-label="关闭预览"
+          className="absolute -top-3 -right-3 z-10 h-9 w-9 rounded-full bg-white text-gray-700 shadow-lg hover:bg-gray-100"
+        >
+          ✕
+        </button>
+        {/* 原图按真实比例完整展示，不裁切 */}
+        <img
+          src={url}
+          alt={caption || '放大预览'}
+          className="max-h-[85vh] w-auto rounded-lg object-contain"
+        />
+        {caption && (
+          <p className="mt-2 text-center text-sm text-white/90">{caption}</p>
+        )}
+      </div>
+    </div>
+  );
+}