feat: 添加图片轻箱功能，支持点击图片预览和下载，优化附件展示逻辑

web/src/components/Chat/MessageBubble.tsx

@@ -1,5 +1,5 @@
-import { useState } from 'react'
-import { User, Bot, Wrench, CheckCircle, AlertCircle, Terminal, File, Image, FileText, Music, Video, Download, ChevronDown, ChevronRight, Copy, Check, Loader2, XCircle, Clock, Loader } from 'lucide-react'
+import { useState, useEffect } from 'react'
+import { User, Bot, Wrench, CheckCircle, AlertCircle, Terminal, File, Image, FileText, Music, Video, Download, ChevronDown, ChevronRight, Copy, Check, Loader2, XCircle, Clock, Loader, X } from 'lucide-react'
 import ReactMarkdown from 'react-markdown'
 import remarkGfm from 'remark-gfm'
 import type { ChatMessage, Attachment, TaskToolResult } from '../../types/protocol'
@@ -144,6 +144,68 @@ function AttachmentCard({ attachment }: { attachment: Attachment }) {
   )
 }
 
+function ImageLightbox({ src, mimeType, fileName, onClose }: { src: string; mimeType: string; fileName?: string; onClose: () => void }) {
+  useEffect(() => {
+    const handleKeyDown = (e: KeyboardEvent) => {
+      if (e.key === 'Escape') onClose()
+    }
+    document.addEventListener('keydown', handleKeyDown)
+    return () => document.removeEventListener('keydown', handleKeyDown)
+  }, [onClose])
+
+  const handleDownload = (e: React.MouseEvent) => {
+    e.stopPropagation()
+    const byteChars = atob(src)
+    const byteNums = new Array(byteChars.length)
+    for (let i = 0; i < byteChars.length; i++) {
+      byteNums[i] = byteChars.charCodeAt(i)
+    }
+    const byteArr = new Uint8Array(byteNums)
+    const blob = new Blob([byteArr], { type: mimeType })
+    const url = URL.createObjectURL(blob)
+    const a = document.createElement('a')
+    a.href = url
+    a.download = fileName || `image.${mimeType.split('/')[1] || 'png'}`
+    document.body.appendChild(a)
+    a.click()
+    document.body.removeChild(a)
+    URL.revokeObjectURL(url)
+  }
+
+  return (
+    <div
+      className="fixed inset-0 z-50 flex items-center justify-center bg-black/85 backdrop-blur-sm animate-fade-in"
+      onClick={onClose}
+    >
+      {/* 顶部工具栏 */}
+      <div className="absolute top-4 right-4 flex items-center gap-2 z-10">
+        <button
+          onClick={handleDownload}
+          className="p-2 rounded-full bg-white/10 hover:bg-white/20 text-white/80 hover:text-white transition-colors"
+          aria-label="下载图片"
+          title="下载图片"
+        >
+          <Download className="h-5 w-5" />
+        </button>
+        <button
+          onClick={onClose}
+          className="p-2 rounded-full bg-white/10 hover:bg-white/20 text-white/80 hover:text-white transition-colors"
+          aria-label="关闭"
+          title="关闭"
+        >
+          <X className="h-5 w-5" />
+        </button>
+      </div>
+      <img
+        src={`data:${mimeType};base64,${src}`}
+        className="max-w-[90vw] max-h-[90vh] object-contain rounded-lg shadow-2xl"
+        onClick={(e) => e.stopPropagation()}
+        alt="图片预览"
+      />
+    </div>
+  )
+}
+
 function CopyButton({ text, className = '' }: { text: string; className?: string }) {
   const [copied, setCopied] = useState(false)
 
@@ -198,6 +260,16 @@ export function MessageBubble({ message, onNavigateToSubAgent }: MessageBubblePr
   const isTool = message.role === 'tool'
   const isMergedTool = message.type === 'merged_tool'
   const [toolExpanded, setToolExpanded] = useState(false)
+  const [lightboxImage, setLightboxImage] = useState<{ base64: string; mimeType: string; fileName?: string } | null>(null)
+
+  const lightboxElement = lightboxImage ? (
+    <ImageLightbox
+      src={lightboxImage.base64}
+      mimeType={lightboxImage.mimeType}
+      fileName={lightboxImage.fileName}
+      onClose={() => setLightboxImage(null)}
+    />
+  ) : null
 
   if (isMergedTool) {
     const status = message.status || 'calling'
@@ -468,6 +540,7 @@ export function MessageBubble({ message, onNavigateToSubAgent }: MessageBubblePr
             )}
           </div>
         </div>
+        {lightboxElement}
       </div>
     )
   }
@@ -616,14 +689,32 @@ export function MessageBubble({ message, onNavigateToSubAgent }: MessageBubblePr
             </div>
           )}
           {message.attachments && message.attachments.length > 0 && (
-            <div className="mt-2 space-y-1">
-              {message.attachments.map((att: Attachment, idx: number) => (
-                <AttachmentCard key={idx} attachment={att} />
-              ))}
+            <div className="mt-2 space-y-2">
+              {message.attachments.some(att => att.media_type === 'image' && att.content_base64) && (
+                <div className="flex flex-wrap gap-2">
+                  {message.attachments
+                    .filter(att => att.media_type === 'image' && att.content_base64)
+                    .map((att, idx) => (
+                      <img
+                        key={`img-${idx}`}
+                        src={`data:${att.mime_type || 'image/png'};base64,${att.content_base64}`}
+                        alt={att.file_name || att.path || '图片'}
+                        className="max-w-64 max-h-48 rounded-xl object-cover cursor-pointer border border-[var(--border-color)] hover:border-[var(--accent-cyan)]/40 hover:scale-[1.02] transition-all duration-200 shadow-md"
+                        onClick={() => setLightboxImage({ base64: att.content_base64!, mimeType: att.mime_type || 'image/png', fileName: att.file_name || att.path })}
+                      />
+                    ))}
+                </div>
+              )}
+              {message.attachments
+                .filter(att => att.media_type !== 'image' || !att.content_base64)
+                .map((att, idx) => (
+                  <AttachmentCard key={`att-${idx}`} attachment={att} />
+                ))}
             </div>
           )}
         </div>
       </div>
+      {lightboxElement}
     </div>
   )
 }