refactor(聊天头部): 简化 ChatHeaderInfo 组件

- 移除模型选择器功能及相关 UI
- 简化组件 props，只保留助手信息展示
- 清理未使用的导入和状态管理代码

src/app/chat/[id]/page.tsx

@@ -552,13 +552,10 @@ export default function ChatPage({ params }: PageProps) {
             </div>
           </div>
 
-          {/* 第二行：助手和模型信息 */}
+          {/* 第二行：助手信息 */}
           <div className="pl-12">
             <ChatHeaderInfo
               assistant={conversation?.assistant || null}
-              currentModel={selectedModelId}
-              models={modelOptions}
-              onModelChange={handleModelChange}
             />
           </div>
         </header>

src/components/features/ChatHeader.tsx

@@ -1,8 +1,6 @@
 'use client';
 
-import { useState, useRef, useEffect } from 'react';
-import { ChevronDown, Check, Bot } from 'lucide-react';
-import { cn } from '@/lib/utils';
+import { Bot } from 'lucide-react';
 import { IconRenderer } from '@/components/ui/IconRenderer';
 
 interface Assistant {
@@ -12,71 +10,13 @@ interface Assistant {
   description: string | null;
 }
 
-interface Model {
-  id: string;
-  name: string;
-  displayName: string;
-  tag?: string;
-}
-
 interface ChatHeaderInfoProps {
   assistant: Assistant | null;
-  currentModel: string;
-  models: Model[];
-  onModelChange: (modelId: string) => Promise<void>;
 }
 
 export function ChatHeaderInfo({
   assistant,
-  currentModel,
-  models,
-  onModelChange,
 }: ChatHeaderInfoProps) {
-  const [isModelMenuOpen, setIsModelMenuOpen] = useState(false);
-  const [isChanging, setIsChanging] = useState(false);
-  const [showSuccess, setShowSuccess] = useState(false);
-  const menuRef = useRef<HTMLDivElement>(null);
-
-  // 点击外部关闭菜单
-  useEffect(() => {
-    const handleClickOutside = (event: MouseEvent) => {
-      if (menuRef.current && !menuRef.current.contains(event.target as Node)) {
-        setIsModelMenuOpen(false);
-      }
-    };
-    if (isModelMenuOpen) {
-      document.addEventListener('mousedown', handleClickOutside);
-    }
-    return () => {
-      document.removeEventListener('mousedown', handleClickOutside);
-    };
-  }, [isModelMenuOpen]);
-
-  // 处理模型切换
-  const handleModelSelect = async (modelId: string) => {
-    if (modelId === currentModel || isChanging) return;
-
-    try {
-      setIsChanging(true);
-      await onModelChange(modelId);
-      setIsModelMenuOpen(false);
-
-      // 显示成功提示
-      setShowSuccess(true);
-      setTimeout(() => {
-        setShowSuccess(false);
-      }, 2000);
-    } catch (error) {
-      console.error('Failed to change model:', error);
-    } finally {
-      setIsChanging(false);
-    }
-  };
-
-  // 获取当前模型的显示名称
-  const currentModelInfo = models.find((m) => m.id === currentModel);
-  const modelDisplayName = currentModelInfo?.displayName || currentModel;
-
   return (
     <div className="flex items-center gap-2 text-sm">
       {/* 助手信息 */}
@@ -98,79 +38,6 @@ export function ChatHeaderInfo({
           </>
         )}
       </div>
-
-      {/* 分隔符 */}
-      <span className="text-[var(--color-text-quaternary)]">·</span>
-
-      {/* 模型选择器 */}
-      <div className="relative" ref={menuRef}>
-        <button
-          onClick={() => setIsModelMenuOpen(!isModelMenuOpen)}
-          disabled={isChanging}
-          className={cn(
-            'flex items-center gap-1 px-2 py-1 rounded-md transition-colors',
-            'text-[var(--color-text-secondary)] hover:bg-[var(--color-bg-hover)]',
-            isChanging && 'opacity-50 cursor-not-allowed'
-          )}
-        >
-          <span className="max-w-[280px] truncate">{currentModel}</span>
-          <ChevronDown
-            size={14}
-            className={cn(
-              'flex-shrink-0 transition-transform',
-              isModelMenuOpen && 'rotate-180'
-            )}
-          />
-        </button>
-
-        {/* 模型下拉菜单 */}
-        {isModelMenuOpen && (
-          <div className="absolute left-0 top-full mt-1 bg-[var(--color-bg-primary)] border border-[var(--color-border)] rounded-lg shadow-lg py-1 z-30 min-w-[280px] max-h-[400px] overflow-y-auto">
-            <div className="px-3 py-2 text-xs font-medium text-[var(--color-text-tertiary)] uppercase tracking-wider border-b border-[var(--color-border)]">
-              选择模型
-            </div>
-            {models.map((model) => (
-              <button
-                key={model.id}
-                onClick={() => handleModelSelect(model.id)}
-                disabled={isChanging}
-                className={cn(
-                  'w-full px-3 py-2.5 text-left text-sm flex items-center justify-between gap-2 transition-colors',
-                  model.id === currentModel
-                    ? 'bg-[var(--color-primary-light)] text-[var(--color-primary)]'
-                    : 'text-[var(--color-text-secondary)] hover:bg-[var(--color-bg-hover)]',
-                  isChanging && 'opacity-50'
-                )}
-              >
-                <div className="flex flex-col gap-0.5 min-w-0">
-                  <span className="font-medium truncate">{model.displayName}</span>
-                  <span className="text-xs text-[var(--color-text-tertiary)] truncate">
-                    {model.id}
-                  </span>
-                </div>
-                <div className="flex items-center gap-2 flex-shrink-0">
-                  {model.tag && (
-                    <span className="px-1.5 py-0.5 text-xs bg-[var(--color-primary-light)] text-[var(--color-primary)] rounded">
-                      {model.tag}
-                    </span>
-                  )}
-                  {model.id === currentModel && (
-                    <Check size={16} className="text-[var(--color-primary)]" />
-                  )}
-                </div>
-              </button>
-            ))}
-          </div>
-        )}
-      </div>
-
-      {/* 成功提示 */}
-      {showSuccess && (
-        <div className="flex items-center gap-1 text-green-600 text-xs animate-fade-in">
-          <Check size={14} />
-          <span>已切换</span>
-        </div>
-      )}
     </div>
   );
 }