fix(web): omit referrer when loading message images

Set no-referrer on message thumbnails and previews to prevent
QQ image requests from returning 400 and triggering ORB.

Add browser coverage for image loading and request headers.

web/src/app/home/monitoring/components/MessageContentRenderer.tsx

@@ -87,6 +87,7 @@ export function MessageContentRenderer({
           <span key={index} className="inline-block align-middle mx-1">
             <img
               src={imageUrl}
+              referrerPolicy="no-referrer"
               alt="Message attachment"
               className="w-20 h-20 object-cover rounded cursor-pointer hover:opacity-80 transition-opacity border"
               onClick={(e) => {

web/src/app/home/pipelines/components/debug-dialog/ImagePreviewDialog.tsx

@@ -35,6 +35,7 @@ export default function ImagePreviewDialog({
         {/* 图片 */}
         <img
           src={imageUrl}
+          referrerPolicy="no-referrer"
           alt="Preview"
           className="max-w-[50vw] max-h-[50vh] object-contain rounded-lg shadow-2xl bg-white"
           onClick={(e) => e.stopPropagation()}