feat(侧边栏): 集成消息搜索入口

- 添加搜索入口按钮显示快捷键提示
- 支持全局快捷键 ⌘K / Ctrl+K 打开搜索
- 集成 SearchModal 搜索弹框组件

src/components/layout/Sidebar.tsx

@@ -2,14 +2,15 @@
 
 import Link from 'next/link';
 import { usePathname, useRouter } from 'next/navigation';
-import { Plus, PanelLeft, Trash2, MoreHorizontal, Loader2, Pencil, Check, X, Bot, Bookmark } from 'lucide-react';
+import { Plus, PanelLeft, Trash2, MoreHorizontal, Loader2, Pencil, Check, X, Bot, Bookmark, Search } from 'lucide-react';
 import { UserMenu } from '@/components/ui/UserMenu';
 import { NewChatModal } from '@/components/features/NewChatModal';
+import { SearchModal } from '@/components/features/SearchModal';
 import { cn } from '@/lib/utils';
 import { useConversations } from '@/hooks/useConversations';
 import { useAuth } from '@/providers/AuthProvider';
 import type { Conversation } from '@/drizzle/schema';
-import { useState, useRef, useEffect } from 'react';
+import { useState, useRef, useEffect, useCallback } from 'react';
 
 interface SidebarProps {
   isOpen?: boolean;
@@ -26,6 +27,7 @@ export function Sidebar({ isOpen = true }: SidebarProps) {
   const [editingTitle, setEditingTitle] = useState('');
   const [isSubmitting, setIsSubmitting] = useState(false);
   const [showNewChatModal, setShowNewChatModal] = useState(false);
+  const [showSearchModal, setShowSearchModal] = useState(false);
   const inputRef = useRef<HTMLInputElement>(null);
   const menuRef = useRef<HTMLDivElement>(null);
 
@@ -52,6 +54,22 @@ export function Sidebar({ isOpen = true }: SidebarProps) {
     };
   }, [menuOpen]);
 
+  // 全局键盘快捷键：⌘K / Ctrl+K 打开搜索
+  useEffect(() => {
+    const handleKeyDown = (e: KeyboardEvent) => {
+      // ⌘K (Mac) 或 Ctrl+K (Windows/Linux)
+      if ((e.metaKey || e.ctrlKey) && e.key === 'k') {
+        e.preventDefault();
+        setShowSearchModal(true);
+      }
+    };
+
+    document.addEventListener('keydown', handleKeyDown);
+    return () => {
+      document.removeEventListener('keydown', handleKeyDown);
+    };
+  }, []);
+
   // 创建新对话 - 显示选择助手弹框
   const handleNewChat = () => {
     setShowNewChatModal(true);
@@ -142,6 +160,21 @@ export function Sidebar({ isOpen = true }: SidebarProps) {
           </button>
         </div>
 
+        {/* 搜索入口按钮 */}
+        <div className="px-3 pb-3">
+          <button
+            onClick={() => setShowSearchModal(true)}
+            className="w-full flex items-center gap-2.5 px-3 py-2.5 bg-[var(--color-bg-tertiary)] border border-[var(--color-border-light)] rounded text-[var(--color-text-tertiary)] text-sm hover:bg-[var(--color-bg-hover)] hover:border-[var(--color-border)] hover:text-[var(--color-text-secondary)] transition-all"
+          >
+            <Search size={16} className="flex-shrink-0" />
+            <span className="flex-1 text-left">搜索消息...</span>
+            <span className="flex items-center gap-0.5 text-[11px]">
+              <kbd className="inline-flex items-center justify-center px-1.5 py-0.5 bg-[var(--color-bg-primary)] border border-[var(--color-border)] rounded text-[10px] shadow-sm">⌘</kbd>
+              <kbd className="inline-flex items-center justify-center px-1.5 py-0.5 bg-[var(--color-bg-primary)] border border-[var(--color-border)] rounded text-[10px] shadow-sm">K</kbd>
+            </span>
+          </button>
+        </div>
+
         {/* 助手库入口 */}
         <div className="px-4 pb-2">
           <Link
@@ -319,6 +352,12 @@ export function Sidebar({ isOpen = true }: SidebarProps) {
         isOpen={showNewChatModal}
         onClose={() => setShowNewChatModal(false)}
       />
+
+      {/* 搜索弹框 */}
+      <SearchModal
+        isOpen={showSearchModal}
+        onClose={() => setShowSearchModal(false)}
+      />
     </>
   );
 }