feat: 添加浏览器favicon，优化消息操作按钮（复制+重新生成）

templates/index.html

@@ -4,6 +4,8 @@
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>AI 对话系统 v2.0</title>
+    <!-- Favicon -->
+    <link rel="icon" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><text y='.9em' font-size='90'>🤖</text></svg>">
     <link href="https://cdn.jsdelivr.net/npm/remixicon@3.5.0/fonts/remixicon.css" rel="stylesheet">
     <link href="https://cdn.jsdelivr.net/npm/github-markdown-css@5.2.0/github-markdown-light.min.css" rel="stylesheet">
     <style>
@@ -49,11 +51,14 @@
         /* 用户消息样式 */
         .user-message-text { background: #f0f0f0; padding: 12px 16px; border-radius: 12px; font-size: 15px; }
         
-        /* 复制按钮 */
+        /* 消息操作按钮 */
-        .copy-btn { position: absolute; top: 8px; right: 8px; padding: 4px 8px; background: rgba(0,0,0,0.05); border: 1px solid #ddd; border-radius: 4px; cursor: pointer; font-size: 12px; color: #666; opacity: 0; transition: opacity 0.2s; }
+        .message-actions { display: flex; gap: 8px; margin-top: 8px; opacity: 0; transition: opacity 0.2s; }
-        .message-content:hover .copy-btn { opacity: 1; }
+        .message-content:hover + .message-actions,
-        .copy-btn:hover { background: rgba(0,0,0,0.1); }
+        .message-actions:hover { opacity: 1; }
-        .copy-btn.copied { color: #10a37f; border-color: #10a37f; }
+        .action-btn { padding: 6px 12px; background: #f5f5f5; border: 1px solid #e0e0e0; border-radius: 6px; cursor: pointer; font-size: 12px; color: #666; display: flex; align-items: center; gap: 4px; transition: all 0.2s; }
+        .action-btn:hover { background: #e8e8e8; border-color: #ccc; }
+        .action-btn.copied { color: #10a37f; border-color: #10a37f; background: #e8f5e9; }
+        .action-btn.regenerate:hover { color: #667eea; border-color: #667eea; }
         
         /* 思考内容样式 */
         .thinking-block { background: #f8f9fa; border-left: 3px solid #667eea; padding: 12px 16px; margin: 8px 0 16px 0; font-size: 14px; color: #666; border-radius: 4px; position: relative; }
@@ -167,6 +172,7 @@
         let currentAgentId = null;
         let agents = [];
         let quickPhrases = [];
+        let lastUserMessage = null; // 存储最后一条用户消息，用于重新生成
         
         document.addEventListener('DOMContentLoaded', () => {
             loadAgents();
@@ -234,7 +240,10 @@
                 case 'new_conversation': currentConversationId = data.conversation_id; loadConversations(); clearMessages(); break;
                 case 'agent_switched': currentAgentId = data.agent_id; break;
                 case 'stream_end': document.getElementById('sendBtn').disabled = false; break;
-                case 'user_message': appendMessage('user', data.message.content); break;
+                case 'user_message': 
+                    lastUserMessage = data.message.content; // 存储最后一条用户消息
+                    appendMessage('user', data.message.content); 
+                    break;
                 case 'assistant_message': appendMessage('assistant', data.message.content, data.message.thinking_content, data.message.agent_name); document.getElementById('sendBtn').disabled = false; break;
                 case 'error': showError(data.message); document.getElementById('sendBtn').disabled = false; break;
             }
@@ -269,9 +278,15 @@
             } else {
                 html += `<div class="user-message-text">${escapeHtml(content)}</div>`;
             }
-            // 复制按钮 - 使用隐藏input存储原始内容
+            html += `</div>`;
+            
+            // 操作按钮 - 使用隐藏input存储原始内容
             html += `<input type="hidden" class="copy-source" value="${content.replace(/"/g, '&quot;')}">`;
-            html += `<button class="copy-btn" onclick="copyMessage(this)"><i class="ri-file-copy-line"></i> 复制</button>`;
+            html += `<div class="message-actions">`;
+            html += `<button class="action-btn" onclick="copyMessage(this)"><i class="ri-file-copy-line"></i> 复制</button>`;
+            if (role === 'assistant') {
+                html += `<button class="action-btn regenerate" onclick="regenerateMessage()"><i class="ri-refresh-line"></i> 重新生成</button>`;
+            }
             html += `</div>`;
             
             // Agent信息
@@ -300,38 +315,47 @@
         
         function copyMessage(btn) {
             // 从隐藏input获取原始内容
-            const hiddenInput = btn.parentElement.querySelector('.copy-source');
+            const hiddenInput = btn.closest('.message-body').querySelector('.copy-source');
             if (!hiddenInput) {
                 console.error('找不到复制源');
                 return;
             }
             const text = hiddenInput.value;
             
-            // 创建临时textarea复制
+            navigator.clipboard.writeText(text).then(() => {
-            const textarea = document.createElement('textarea');
+                btn.innerHTML = '<i class="ri-check-line"></i> 已复制';
-            textarea.value = text;
+                btn.classList.add('copied');
-            textarea.style.position = 'fixed';
+                setTimeout(() => { 
-            textarea.style.left = '-9999px';
+                    btn.innerHTML = '<i class="ri-file-copy-line"></i> 复制'; 
-            document.body.appendChild(textarea);
+                    btn.classList.remove('copied'); 
-            textarea.select();
+                }, 2000);
-            
+            }).catch(err => {
-            try {
-                const success = document.execCommand('copy');
-                if (success) {
-                    btn.innerHTML = '<i class="ri-check-line"></i> 已复制';
-                    btn.classList.add('copied');
-                    setTimeout(() => { 
-                        btn.innerHTML = '<i class="ri-file-copy-line"></i> 复制'; 
-                        btn.classList.remove('copied'); 
-                    }, 2000);
-                } else {
-                    btn.innerHTML = '<i class="ri-error-line"></i> 失败';
-                }
-            } catch (err) {
                 console.error('复制失败:', err);
+                btn.innerHTML = '<i class="ri-error-line"></i> 失败';
+            });
+        }
+        
+        function regenerateMessage() {
+            if (!lastUserMessage) {
+                alert('没有可重新生成的消息');
+                return;
+            }
+            // 移除最后一条助手消息
+            const container = document.getElementById('messagesContainer');
+            const messages = container.querySelectorAll('.message.assistant');
+            if (messages.length > 0) {
+                messages[messages.length - 1].remove();
+            }
+            // 重新发送最后一条用户消息
+            document.getElementById('sendBtn').disabled = true;
+            if (ws?.readyState === WebSocket.OPEN) {
+                ws.send(JSON.stringify({ 
+                    action: 'chat', 
+                    message: lastUserMessage, 
+                    conversation_id: currentConversationId, 
+                    agent_id: currentAgentId 
+                }));
             }
-            
-            document.body.removeChild(textarea);
         }
         
         function escapeHtml(text) {