style(界面): 优化聊天页面布局和用户菜单显示

- 调整聊天输入区域左内边距以适配侧边栏
- 移除用户菜单中的 plan 信息显示
- 简化用户信息展示

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

@@ -495,7 +495,7 @@ export default function ChatPage({ params }: PageProps) {
             background: `linear-gradient(to top, var(--color-bg-secondary) 0%, var(--color-bg-secondary) 80%, transparent 100%)`
           }}
         >
-          <div className="max-w-[900px] mx-auto px-4 pb-4">
+          <div className="max-w-[900px] mx-auto px-4 pb-4 pl-[60px]">
             {isStreaming && (
               <div className="flex justify-center mb-3">
                 <button

src/components/features/ChatHeader.tsx

@@ -3,6 +3,7 @@
 import { useState, useRef, useEffect } from 'react';
 import { ChevronDown, Check, Bot } from 'lucide-react';
 import { cn } from '@/lib/utils';
+import { IconRenderer } from '@/components/ui/IconRenderer';
 
 interface Assistant {
   id: number;
@@ -82,7 +83,12 @@ export function ChatHeaderInfo({
       <div className="flex items-center gap-1.5 text-[var(--color-text-secondary)]">
         {assistant ? (
           <>
-            <span className="text-base">{assistant.icon || '🤖'}</span>
+            <IconRenderer
+              icon={assistant.icon}
+              size={16}
+              fallback="Bot"
+              className="text-[var(--color-primary)]"
+            />
             <span className="font-medium">{assistant.name}</span>
           </>
         ) : (

src/components/features/ChatInput.tsx

@@ -88,7 +88,7 @@ export function ChatInput({
     <div className={cn('w-full max-w-[var(--input-max-width)] mx-auto', className)}>
       <div
         className={cn(
-          'relative flex flex-col bg-[var(--color-bg-primary)] border border-[var(--color-border)] rounded-[18px] p-4 shadow-[var(--shadow-input)]',
+          'relative flex flex-col bg-[var(--color-bg-primary)] border border-[var(--color-border)] rounded-md p-4 shadow-[var(--shadow-input)]',
           'transition-all duration-150',
           'focus-within:border-[var(--color-border-focus)] focus-within:shadow-[var(--shadow-input-focus)]',
           isDragging && 'border-[var(--color-primary)] border-2 bg-[var(--color-primary)]/5'
@@ -100,7 +100,7 @@ export function ChatInput({
       >
         {/* 拖拽覆盖层 */}
         {isDragging && (
-          <div className="absolute inset-0 z-10 flex flex-col items-center justify-center bg-[var(--color-bg-primary)]/90 rounded-[18px] border-2 border-dashed border-[var(--color-primary)]">
+          <div className="absolute inset-0 z-10 flex flex-col items-center justify-center bg-[var(--color-bg-primary)]/90 rounded-md border-2 border-dashed border-[var(--color-primary)]">
             <Upload className="w-8 h-8 text-[var(--color-primary)] mb-2" />
             <p className="text-sm font-medium text-[var(--color-primary)]">
               释放以添加文件

src/components/features/MessageBubble.tsx

@@ -152,7 +152,7 @@ export function MessageBubble({ message, user, thinkingContent, isStreaming, err
               })}
             </div>
           )}
-          <div className="bg-[var(--color-message-user)] text-[var(--color-text-primary)] px-4 py-3 rounded-[18px] text-base leading-relaxed">
+          <div className="bg-[var(--color-message-user)] text-[var(--color-text-primary)] px-4 py-3 rounded-md text-base leading-relaxed">
             {message.content || ((uploadedImages && uploadedImages.length > 0) || (uploadedDocuments && uploadedDocuments.length > 0) ? '(附件)' : '')}
           </div>
           {/* 悬停显示复制按钮 */}
@@ -233,7 +233,7 @@ export function MessageBubble({ message, user, thinkingContent, isStreaming, err
         )}
 
         {/* 主要内容 */}
-        <div className="bg-[var(--color-message-assistant-bg)] border border-[var(--color-message-assistant-border)] rounded-2xl px-5 py-4 shadow-sm">
+        <div className="bg-[var(--color-message-assistant-bg)] border border-[var(--color-message-assistant-border)] rounded-md px-5 py-4 shadow-sm">
           <div className="text-sm text-[var(--color-text-primary)] leading-[1.75]">
             {message.content ? (
               <MarkdownRenderer content={message.content} />

src/components/markdown/CodeBlock.tsx

@@ -1,9 +1,10 @@
 'use client';
 
 import { useEffect, useRef, useState, useMemo } from 'react';
-import { Copy, Check } from 'lucide-react';
+import { Copy, Check, Eye } from 'lucide-react';
 import { cn } from '@/lib/utils';
 import Prism from 'prismjs';
+import { HtmlPreviewModal } from '@/components/ui/HtmlPreviewModal';
 import 'prismjs/components/prism-javascript';
 import 'prismjs/components/prism-typescript';
 import 'prismjs/components/prism-jsx';
@@ -52,10 +53,15 @@ export function CodeBlock({
   className,
 }: CodeBlockProps) {
   const [copied, setCopied] = useState(false);
+  const [previewOpen, setPreviewOpen] = useState(false);
 
   // 规范化语言名称
   const normalizedLanguage = languageAliases[language.toLowerCase()] || language.toLowerCase();
 
+  // 判断是否支持 HTML 预览
+  const isHtmlPreviewable = ['html', 'htm', 'markup'].includes(normalizedLanguage) ||
+                            ['html', 'htm'].includes(language.toLowerCase());
+
   // 使用 useMemo 缓存高亮后的 HTML，避免频繁重新高亮
   const highlightedCode = useMemo(() => {
     const grammar = Prism.languages[normalizedLanguage];
@@ -78,10 +84,23 @@ export function CodeBlock({
   const lines = code.split('\n');
 
   return (
-    <div className={cn('relative group rounded-lg overflow-hidden my-4', className)}>
+    <div className={cn('relative group rounded overflow-hidden my-4', className)}>
       {/* 顶部工具栏 */}
       <div className="flex items-center justify-between px-4 py-2 bg-[#2d2d2d] text-gray-400 text-sm">
         <span className="font-mono">{language || 'code'}</span>
+        <div className="flex items-center gap-2">
+          {/* HTML 预览按钮 */}
+          {isHtmlPreviewable && (
+            <button
+              onClick={() => setPreviewOpen(true)}
+              className="inline-flex items-center gap-1.5 px-2 py-1 rounded hover:bg-white/10 transition-colors text-blue-400 hover:text-blue-300"
+              title="预览 HTML"
+            >
+              <Eye size={14} />
+              <span>预览</span>
+            </button>
+          )}
+          {/* 复制按钮 */}
           <button
             onClick={handleCopy}
             className="inline-flex items-center gap-1.5 px-2 py-1 rounded hover:bg-white/10 transition-colors"
@@ -100,6 +119,7 @@ export function CodeBlock({
             )}
           </button>
         </div>
+      </div>
 
       {/* 代码区域 */}
       <div className="relative overflow-x-auto bg-[#1e1e1e]">
@@ -130,6 +150,16 @@ export function CodeBlock({
           />
         </pre>
       </div>
+
+      {/* HTML 预览模态框 */}
+      {isHtmlPreviewable && (
+        <HtmlPreviewModal
+          htmlCode={code}
+          isOpen={previewOpen}
+          onClose={() => setPreviewOpen(false)}
+          language={language}
+        />
+      )}
     </div>
   );
 }

src/components/ui/HtmlPreviewModal.tsx

@@ -0,0 +1,392 @@
+'use client';
+
+import { useState, useCallback, useEffect, useRef } from 'react';
+import {
+  X,
+  Monitor,
+  Tablet,
+  Smartphone,
+  Maximize2,
+  Minimize2,
+  RefreshCw,
+  Code,
+  Eye,
+  Copy,
+  Check,
+  Download,
+} from 'lucide-react';
+import { cn } from '@/lib/utils';
+import { CodeBlock } from '@/components/markdown/CodeBlock';
+
+interface HtmlPreviewModalProps {
+  /** HTML 代码内容 */
+  htmlCode: string;
+  /** 是否打开 */
+  isOpen: boolean;
+  /** 关闭回调 */
+  onClose: () => void;
+  /** 语言类型，默认 html */
+  language?: string;
+}
+
+// 设备尺寸配置
+type DeviceType = 'desktop' | 'tablet' | 'mobile';
+
+interface DeviceConfig {
+  type: DeviceType;
+  label: string;
+  icon: React.ComponentType<{ size?: number; className?: string }>;
+  width: string;
+  frameClass: string;
+}
+
+const deviceConfigs: DeviceConfig[] = [
+  {
+    type: 'desktop',
+    label: '桌面端',
+    icon: Monitor,
+    width: '100%',
+    frameClass: 'rounded',
+  },
+  {
+    type: 'tablet',
+    label: '平板',
+    icon: Tablet,
+    width: '768px',
+    frameClass: 'rounded-lg',
+  },
+  {
+    type: 'mobile',
+    label: '手机',
+    icon: Smartphone,
+    width: '375px',
+    frameClass: 'rounded-xl',
+  },
+];
+
+// 视图模式
+type ViewMode = 'preview' | 'code';
+
+export function HtmlPreviewModal({
+  htmlCode,
+  isOpen,
+  onClose,
+  language = 'html',
+}: HtmlPreviewModalProps) {
+  const [device, setDevice] = useState<DeviceType>('desktop');
+  const [viewMode, setViewMode] = useState<ViewMode>('preview');
+  const [isFullscreen, setIsFullscreen] = useState(false);
+  const [copied, setCopied] = useState(false);
+  const [iframeKey, setIframeKey] = useState(0); // 用于刷新 iframe
+  const modalRef = useRef<HTMLDivElement>(null);
+
+  // 获取当前设备配置
+  const currentDevice = deviceConfigs.find((d) => d.type === device) || deviceConfigs[0];
+
+  // ESC 关闭 / F11 全屏切换
+  useEffect(() => {
+    if (!isOpen) return;
+
+    const handleKeyDown = (e: KeyboardEvent) => {
+      if (e.key === 'Escape') {
+        if (isFullscreen) {
+          setIsFullscreen(false);
+        } else {
+          onClose();
+        }
+      }
+      // F11 切换全屏
+      if (e.key === 'F11') {
+        e.preventDefault();
+        setIsFullscreen((prev) => !prev);
+      }
+    };
+
+    window.document.addEventListener('keydown', handleKeyDown);
+    window.document.body.style.overflow = 'hidden';
+
+    return () => {
+      window.document.removeEventListener('keydown', handleKeyDown);
+      window.document.body.style.overflow = '';
+    };
+  }, [isOpen, isFullscreen, onClose]);
+
+  // 复制代码
+  const handleCopy = useCallback(async () => {
+    try {
+      await navigator.clipboard.writeText(htmlCode);
+      setCopied(true);
+      setTimeout(() => setCopied(false), 2000);
+    } catch (error) {
+      console.error('Failed to copy:', error);
+    }
+  }, [htmlCode]);
+
+  // 下载 HTML 文件
+  const handleDownload = useCallback(() => {
+    const blob = new Blob([htmlCode], { type: 'text/html;charset=utf-8' });
+    const url = URL.createObjectURL(blob);
+    const link = window.document.createElement('a');
+    link.href = url;
+    link.download = 'preview.html';
+    window.document.body.appendChild(link);
+    link.click();
+    window.document.body.removeChild(link);
+    URL.revokeObjectURL(url);
+  }, [htmlCode]);
+
+  // 刷新预览
+  const handleRefresh = useCallback(() => {
+    setIframeKey((prev) => prev + 1);
+  }, []);
+
+  // 切换全屏
+  const toggleFullscreen = useCallback(() => {
+    setIsFullscreen((prev) => !prev);
+  }, []);
+
+  if (!isOpen) return null;
+
+  return (
+    <div
+      className={cn(
+        'fixed inset-0 z-50 flex items-center justify-center',
+        'bg-black/70 backdrop-blur-sm',
+        'animate-fade-in-fast'
+      )}
+      onClick={onClose}
+    >
+      {/* 主容器 */}
+      <div
+        ref={modalRef}
+        className={cn(
+          'relative bg-[var(--color-bg-primary)] shadow-2xl flex flex-col overflow-hidden',
+          'animate-scale-in-fast',
+          isFullscreen
+            ? 'w-full h-full rounded-none'
+            : 'w-[95vw] max-w-6xl h-[90vh] rounded-md'
+        )}
+        onClick={(e) => e.stopPropagation()}
+      >
+        {/* 头部工具栏 */}
+        <div className="flex items-center justify-between px-4 py-3 border-b border-[var(--color-border)] bg-[var(--color-bg-secondary)]">
+          {/* 左侧：标题和视图切换 */}
+          <div className="flex items-center gap-4">
+            {/* 标题 */}
+            <div className="flex items-center gap-2">
+              <Eye size={18} className="text-[var(--color-primary)]" />
+              <span className="font-medium text-[var(--color-text-primary)]">
+                HTML 预览
+              </span>
+            </div>
+
+            {/* 视图切换 Tab */}
+            <div className="flex items-center bg-[var(--color-bg-tertiary)] rounded-lg p-1">
+              <button
+                onClick={() => setViewMode('preview')}
+                className={cn(
+                  'flex items-center gap-1.5 px-3 py-1.5 rounded-md text-sm font-medium transition-all duration-150',
+                  viewMode === 'preview'
+                    ? 'bg-[var(--color-bg-primary)] text-[var(--color-primary)] shadow-sm'
+                    : 'text-[var(--color-text-tertiary)] hover:text-[var(--color-text-secondary)]'
+                )}
+              >
+                <Eye size={14} />
+                <span>预览</span>
+              </button>
+              <button
+                onClick={() => setViewMode('code')}
+                className={cn(
+                  'flex items-center gap-1.5 px-3 py-1.5 rounded-md text-sm font-medium transition-all duration-150',
+                  viewMode === 'code'
+                    ? 'bg-[var(--color-bg-primary)] text-[var(--color-primary)] shadow-sm'
+                    : 'text-[var(--color-text-tertiary)] hover:text-[var(--color-text-secondary)]'
+                )}
+              >
+                <Code size={14} />
+                <span>代码</span>
+              </button>
+            </div>
+          </div>
+
+          {/* 中间：设备切换器（仅预览模式显示） */}
+          {viewMode === 'preview' && (
+            <div className="flex items-center gap-1 bg-[var(--color-bg-tertiary)] rounded-lg p-1">
+              {deviceConfigs.map((config) => {
+                const Icon = config.icon;
+                return (
+                  <button
+                    key={config.type}
+                    onClick={() => setDevice(config.type)}
+                    className={cn(
+                      'flex items-center justify-center w-9 h-9 rounded-md transition-all duration-150',
+                      device === config.type
+                        ? 'bg-[var(--color-bg-primary)] text-[var(--color-primary)] shadow-sm'
+                        : 'text-[var(--color-text-tertiary)] hover:text-[var(--color-text-secondary)] hover:bg-[var(--color-bg-hover)]'
+                    )}
+                    title={config.label}
+                  >
+                    <Icon size={18} />
+                  </button>
+                );
+              })}
+            </div>
+          )}
+
+          {/* 右侧：操作按钮 */}
+          <div className="flex items-center gap-1">
+            {/* 复制按钮 */}
+            <button
+              onClick={handleCopy}
+              className={cn(
+                'flex items-center gap-1.5 px-3 py-2 rounded-lg text-sm transition-colors duration-150',
+                'text-[var(--color-text-tertiary)] hover:text-[var(--color-text-secondary)]',
+                'hover:bg-[var(--color-bg-hover)]'
+              )}
+              title="复制代码"
+            >
+              {copied ? (
+                <>
+                  <Check size={16} className="text-green-500" />
+                  <span className="text-green-500">已复制</span>
+                </>
+              ) : (
+                <>
+                  <Copy size={16} />
+                  <span>复制</span>
+                </>
+              )}
+            </button>
+
+            {/* 下载按钮 */}
+            <button
+              onClick={handleDownload}
+              className={cn(
+                'flex items-center gap-1.5 px-3 py-2 rounded-lg text-sm transition-colors duration-150',
+                'text-[var(--color-text-tertiary)] hover:text-[var(--color-text-secondary)]',
+                'hover:bg-[var(--color-bg-hover)]'
+              )}
+              title="下载 HTML 文件"
+            >
+              <Download size={16} />
+              <span>下载</span>
+            </button>
+
+            {/* 分隔线 */}
+            <div className="w-px h-6 bg-[var(--color-border)] mx-1" />
+
+            {/* 刷新按钮（仅预览模式） */}
+            {viewMode === 'preview' && (
+              <button
+                onClick={handleRefresh}
+                className={cn(
+                  'w-9 h-9 flex items-center justify-center rounded-lg transition-colors duration-150',
+                  'text-[var(--color-text-tertiary)] hover:text-[var(--color-text-secondary)]',
+                  'hover:bg-[var(--color-bg-hover)]'
+                )}
+                title="刷新预览"
+              >
+                <RefreshCw size={16} />
+              </button>
+            )}
+
+            {/* 全屏切换按钮 */}
+            <button
+              onClick={toggleFullscreen}
+              className={cn(
+                'w-9 h-9 flex items-center justify-center rounded-lg transition-colors duration-150',
+                'text-[var(--color-text-tertiary)] hover:text-[var(--color-text-secondary)]',
+                'hover:bg-[var(--color-bg-hover)]'
+              )}
+              title={isFullscreen ? '退出全屏 (ESC)' : '全屏 (F11)'}
+            >
+              {isFullscreen ? <Minimize2 size={16} /> : <Maximize2 size={16} />}
+            </button>
+
+            {/* 关闭按钮 */}
+            <button
+              onClick={onClose}
+              className={cn(
+                'w-9 h-9 flex items-center justify-center rounded-lg transition-colors duration-150',
+                'text-[var(--color-text-tertiary)] hover:text-[var(--color-text-primary)]',
+                'hover:bg-[var(--color-bg-hover)]'
+              )}
+              title="关闭 (ESC)"
+            >
+              <X size={18} />
+            </button>
+          </div>
+        </div>
+
+        {/* 内容区域 */}
+        <div className="flex-1 overflow-hidden bg-[var(--color-bg-tertiary)]">
+          {viewMode === 'preview' ? (
+            /* 预览模式 */
+            <div className="w-full h-full flex items-center justify-center p-4 overflow-auto">
+              {/* 设备框架 */}
+              <div
+                className={cn(
+                  'bg-white shadow-2xl transition-all duration-300 ease-out overflow-hidden',
+                  currentDevice.frameClass,
+                  // 非桌面模式添加设备边框效果
+                  device !== 'desktop' && 'border-8 border-gray-800'
+                )}
+                style={{
+                  width: currentDevice.width,
+                  height: device === 'desktop' ? '100%' : device === 'tablet' ? '85%' : '90%',
+                  maxWidth: '100%',
+                  maxHeight: '100%',
+                }}
+              >
+                {/* 手机顶部刘海 */}
+                {device === 'mobile' && (
+                  <div className="h-6 bg-gray-800 flex items-center justify-center">
+                    <div className="w-20 h-4 bg-black rounded-full" />
+                  </div>
+                )}
+
+                {/* iframe 预览 */}
+                <iframe
+                  key={iframeKey}
+                  srcDoc={htmlCode}
+                  sandbox="allow-scripts allow-same-origin"
+                  className="w-full bg-white"
+                  style={{
+                    height: device === 'mobile' ? 'calc(100% - 24px)' : '100%',
+                    border: 'none',
+                  }}
+                  title="HTML 预览"
+                />
+              </div>
+            </div>
+          ) : (
+            /* 代码模式 */
+            <div className="w-full h-full overflow-auto">
+              <CodeBlock
+                code={htmlCode}
+                language={language}
+                showLineNumbers={true}
+                className="my-0 rounded-none h-full"
+              />
+            </div>
+          )}
+        </div>
+
+        {/* 底部状态栏 */}
+        <div className="flex items-center justify-between px-4 py-2 border-t border-[var(--color-border)] bg-[var(--color-bg-secondary)]">
+          <div className="flex items-center gap-4 text-xs text-[var(--color-text-tertiary)]">
+            <span>
+              {htmlCode.length.toLocaleString()} 字符
+            </span>
+            <span>
+              {htmlCode.split('\n').length} 行
+            </span>
+          </div>
+          <div className="text-xs text-[var(--color-text-tertiary)]">
+            ESC 关闭 · F11 全屏
+          </div>
+        </div>
+      </div>
+    </div>
+  );
+}

src/components/ui/UserMenu.tsx

@@ -98,9 +98,6 @@ export function UserMenu() {
           <div className="text-sm text-[var(--color-text-primary)] truncate">
             {user.email}
           </div>
-          <div className="text-xs text-[var(--color-text-tertiary)] capitalize">
-            {user.plan} plan
-          </div>
         </div>
         {isOpen ? (
           <ChevronUp size={16} className="text-[var(--color-text-tertiary)] flex-shrink-0" />