feat(chat): 为媒体工具添加骨架屏占位并优化管线进度组件

- 在 ChatMessage 组件中为图片/视频生成工具添加骨架屏占位卡片
- 优化 PipelineProgress 组件，使用阶段标签和状态指示器替代进度条
- 添加骨架屏 shimmer 动画样式

web/client/src/components/chat/ChatMessage.tsx

@@ -1,7 +1,7 @@
 import { useState, useCallback } from 'react';
 import { cn } from '@/lib/utils';
 import { renderMarkdown } from '@/lib/markdown';
-import { Bot, User, Copy, Trash2, ChevronDown, ChevronRight, RefreshCw, ArrowRight, Quote, Brain, X, ChevronLeft, ChevronRight as ChevronRightIcon, Play, Loader2, CheckCircle2, XCircle } from 'lucide-react';
+import { Bot, User, Copy, Trash2, ChevronDown, ChevronRight, RefreshCw, ArrowRight, Quote, Brain, X, ChevronLeft, ChevronRight as ChevronRightIcon, Play, Loader2, CheckCircle2, XCircle, Image as ImageIcon, Film } from 'lucide-react';
 import { ConfirmDialog } from '@/components/ui/confirm';
 import { useConfirm } from '@/hooks/useConfirm';
 import { useToast } from '@/hooks/useToast';
@@ -59,6 +59,21 @@ function AssetLightbox({ assets, currentIndex, onClose, onNavigate }: {
   );
 }
 
+function SkeletonCard({ type }: { type: 'image' | 'video' }) {
+  return (
+    <div className="w-24 h-24 rounded-lg border border-zinc-200/80 bg-gradient-to-br from-zinc-50 to-zinc-100/80 relative overflow-hidden">
+      <div className="absolute inset-0 flex items-center justify-center">
+        {type === 'image' ? (
+          <ImageIcon size={18} className="text-zinc-300/70" />
+        ) : (
+          <Film size={18} className="text-zinc-300/70" />
+        )}
+      </div>
+      <div className="absolute inset-0 skeleton-shimmer" />
+    </div>
+  );
+}
+
 type MessageState = 'streaming' | 'thinking' | 'done';
 
 interface Props {
@@ -124,6 +139,13 @@ export function ChatMessage({ message, isLast, isThinking, onRegenerate, onConti
       }
     }
 
+    // Media tool skeleton logic
+    const isMediaTool = toolName === 'generate_images' || toolName === 'generate_videos';
+    const mediaType: 'image' | 'video' = toolName === 'generate_images' ? 'image' : 'video';
+    const expectedCount = isMediaTool && message.toolInput?.count ? (message.toolInput.count as number) : 0;
+    const assetCount = message.assets?.length || 0;
+    const remainingCount = isRunning ? Math.max(0, expectedCount - assetCount) : 0;
+
     return (
       <div className="py-1">
         <div className={cn(
@@ -155,11 +177,11 @@ export function ChatMessage({ message, isLast, isThinking, onRegenerate, onConti
             )}
           </div>
 
-          {/* Assets grid - images and video thumbnails */}
-          {message.assets && message.assets.length > 0 && (
+          {/* Assets + Skeleton cards grid */}
+          {(message.assets && message.assets.length > 0) || (isRunning && isMediaTool && remainingCount > 0) ? (
             <div className="px-3 pb-3 pt-1">
               <div className="flex flex-wrap gap-2">
-                {message.assets.map((asset, i) => (
+                {message.assets?.map((asset, i) => (
                   <button
                     key={i}
                     onClick={() => setPreviewIndex(i)}
@@ -185,18 +207,18 @@ export function ChatMessage({ message, isLast, isThinking, onRegenerate, onConti
                     <div className="absolute inset-0 bg-black/0 group-hover/thumb:bg-black/10 transition-colors" />
                   </button>
                 ))}
+                {isRunning && isMediaTool && remainingCount > 0 && Array.from({ length: remainingCount }, (_, i) => (
+                  <SkeletonCard key={`skel-${i}`} type={mediaType} />
+                ))}
               </div>
             </div>
-          )}
-
-          {/* Running animation - liquid fill wave */}
-          {isRunning && (
+          ) : isRunning ? (
             <div className="px-3 pb-3">
               <div className="tool-progress-track h-1.5 w-full rounded-full bg-indigo-100/60 overflow-hidden">
                 <div className="tool-shimmer-bar h-full" />
               </div>
             </div>
-          )}
+          ) : null}
         </div>
 
         {/* Lightbox */}

web/client/src/components/chat/PipelineProgress.tsx

@@ -1,4 +1,5 @@
 import { cn } from '@/lib/utils';
+import { CheckCircle2, Loader2 } from 'lucide-react';
 
 interface Props {
   phase: string;
@@ -8,34 +9,49 @@ interface Props {
   status?: string;
 }
 
+const PHASES = [
+  { key: 'images', label: '图片' },
+  { key: 'upload', label: '上传' },
+  { key: 'videos', label: '视频' },
+  { key: 'tts', label: '配音' },
+  { key: 'assemble', label: '成片' },
+];
+
 export function PipelineProgress({ phase, progress, currentItem, totalItems, status }: Props) {
-  const phaseLabel: Record<string, string> = {
-    images: '生成图片',
-    upload: '上传素材',
-    videos: '生成视频',
-    tts: '配音',
-    assemble: '成片组装',
-  };
+  const currentIdx = PHASES.findIndex(p => p.key === phase);
 
   return (
     <div className="bg-gradient-to-br from-zinc-900 to-zinc-800 border border-zinc-700/50 rounded-xl p-3.5 my-2 shadow-lg shadow-zinc-900/20">
-      <div className="flex items-center justify-between mb-2">
-        <span className="text-xs text-zinc-400 font-medium">
-          {phaseLabel[phase] || phase}
-          {currentItem && totalItems ? ` (${currentItem}/${totalItems})` : ''}
-        </span>
-        <span className="text-xs font-mono text-zinc-500">{progress}%</span>
+      <div className="flex items-center gap-1.5">
+        {PHASES.map((p, i) => {
+          const isDone = i < currentIdx || (i === currentIdx && progress >= 100);
+          const isActive = i === currentIdx && progress < 100;
+
+          return (
+            <div key={p.key} className={cn(
+              'flex items-center gap-1.5 px-2.5 py-1.5 rounded-lg text-xs font-medium transition-all duration-300',
+              isDone ? 'bg-emerald-500/15 text-emerald-400' :
+              isActive ? 'bg-indigo-500/15 text-indigo-400 ring-1 ring-indigo-400/30' :
+              'bg-zinc-800/50 text-zinc-600'
+            )}>
+              {isDone ? (
+                <CheckCircle2 size={12} className="text-emerald-400" />
+              ) : isActive ? (
+                <Loader2 size={12} className="text-indigo-400 animate-spin" />
+              ) : (
+                <div className="w-1.5 h-1.5 rounded-full bg-zinc-600" />
+              )}
+              <span>{p.label}</span>
+              {isActive && currentItem != null && totalItems != null && (
+                <span className="text-[10px] opacity-60 ml-0.5">
+                  {currentItem}/{totalItems}
+                </span>
+              )}
+            </div>
+          );
+        })}
       </div>
-      <div className="w-full h-1.5 bg-zinc-700/50 rounded-full overflow-hidden">
-        <div
-          className={cn(
-            'h-full rounded-full transition-all duration-700 ease-out',
-            progress < 100 ? 'bg-gradient-to-r from-blue-500 to-indigo-400' : 'bg-gradient-to-r from-emerald-500 to-green-400'
-          )}
-          style={{ width: `${progress}%` }}
-        />
-      </div>
-      {status && <p className="text-xs text-zinc-500 mt-1.5">{status}</p>}
+      {status && <p className="text-xs text-zinc-500 mt-2">{status}</p>}
     </div>
   );
 }

web/client/src/index.css

@@ -65,6 +65,16 @@
   animation: liquid-glow 2.4s ease-in-out infinite;
 }
 
+/* Skeleton card shimmer */
+@keyframes shimmer-slide {
+  0% { transform: translateX(-100%); }
+  100% { transform: translateX(100%); }
+}
+.skeleton-shimmer {
+  background: linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.5) 50%, transparent 100%);
+  animation: shimmer-slide 1.5s ease-in-out infinite;
+}
+
 /* GitHub-style Markdown - light theme */
 @layer components {
   .markdown-body {