style(组件): 优化摘要按钮样式

- 移除 Tooltip 包装，改用原生 title 属性
- 调整按钮为图标 + 文字的布局形式
- 统一按钮样式与其他操作按钮一致
- 简化已有摘要指示器的样式

src/components/features/SummaryGenerator/SummaryButton.tsx

@@ -4,7 +4,6 @@ import { useState } from 'react';
 import { Sparkles } from 'lucide-react';
 import { SummaryModal } from './SummaryModal';
 import type { SummaryMessage } from './types';
-import { Tooltip } from '@/components/ui/Tooltip';
 
 interface SummaryButtonProps {
   conversationId: string;
@@ -39,21 +38,20 @@ export function SummaryButton({
 
   return (
     <>
-      <Tooltip content="智能摘要" position="bottom">
-        <button
-          type="button"
-          onClick={handleClick}
-          className={`relative p-2 rounded text-[var(--color-text-secondary)] hover:bg-[var(--color-bg-secondary)] hover:text-[var(--color-primary)] transition-all duration-150 ${className}`}
-          aria-label="生成智能摘要"
-        >
-          <Sparkles size={18} />
+      <button
+        type="button"
+        onClick={handleClick}
+        className={`relative flex items-center gap-2 px-3 py-1.5 text-sm text-[var(--color-text-secondary)] hover:bg-[var(--color-bg-hover)] rounded-[4px] transition-colors ${className}`}
+        title="生成智能摘要"
+      >
+        <Sparkles size={16} />
+        <span>摘要</span>
 
-          {/* 已有摘要指示器 */}
-          {hasSummary && (
-            <span className="absolute top-1 right-1 w-2 h-2 bg-[var(--color-primary)] rounded-full border-2 border-[var(--color-bg-primary)] animate-pulse" />
-          )}
-        </button>
-      </Tooltip>
+        {/* 已有摘要指示器 */}
+        {hasSummary && (
+          <span className="absolute top-0.5 right-0.5 w-1.5 h-1.5 bg-[var(--color-primary)] rounded-full" />
+        )}
+      </button>
 
       {/* 摘要 Modal */}
       <SummaryModal