feat(ai-chat): 优化历史消息时间显示与搜索定位

- 时间显示人性化：昨天/前天/跨年日期
- 搜索上下导航修复 scroll-into-view 触发逻辑

lang/en-us/ai-chat/index.js

@@ -8,6 +8,11 @@ export const lang = {
 	send: 'Send',
 	retry: 'Retry',
 
+	// ====== Time Format ======
+	timeFormatToday: 'Today',
+	timeFormatYesterday: 'Yesterday',
+	timeFormatBeforeYesterday: 'Day before yesterday',
+
 	// ====== ai-chat-message ======
 	aiNickname: 'AI Assistant',
 	defaultNickname: 'Me',

lang/zh-cn/ai-chat/index.js

@@ -8,6 +8,11 @@ export const lang = {
 	send: '发送',
 	retry: '重试',
 
+	// ====== 时间格式化 ======
+	timeFormatToday: '今天',
+	timeFormatYesterday: '昨天',
+	timeFormatBeforeYesterday: '前天',
+
 	// ====== ai-chat-message ======
 	aiNickname: '智能助手',
 	defaultNickname: '我',

pages_tool/ai-chat/ai-chat-message.vue

@@ -1291,52 +1291,62 @@ _handleStreamError(msg) {
       return html
     },
     
-    // 格式化时间
+    // 格式化时间（人性化显示）
     formatTime(timestamp) {
-      // 如果没有时间戳，就不显示时间
+      if (!timestamp) return '';
-      if (!timestamp) {
+
-        return '';
-      }
-      
       let date;
-      
+
-      // 如果是字符串格式，例如 "2026-04-16 03:56:20"
       if (typeof timestamp === 'string') {
-        // 手动解析格式 "YYYY-MM-DD HH:mm:ss"
         const parts = timestamp.match(/(\d{4})-(\d{2})-(\d{2})\s+(\d{2}):(\d{2}):(\d{2})/);
         if (parts) {
           const [, year, month, day, hour, minute, second] = parts;
-          // 先解析成本地时间，然后加上8小时时区差
           date = new Date(parseInt(year), parseInt(month) - 1, parseInt(day), parseInt(hour), parseInt(minute), parseInt(second));
-          // 加上8小时
           date.setHours(date.getHours() + 8);
         } else {
-          // 其他字符串格式直接解析
           date = new Date(timestamp);
         }
-      } 
+      } else {
-      // 如果是数字格式
-      else {
         let timeValue = timestamp;
-        
-        // 如果时间戳小于10000000000，说明是秒，需要乘以1000转成毫秒
         if (typeof timeValue === 'number' && timeValue < 10000000000) {
           timeValue = timeValue * 1000;
         }
-        
         date = new Date(timeValue);
       }
-      
+
-      
+      if (isNaN(date.getTime())) return '';
-      // 如果时间无效，就不显示时间
+
-      if (isNaN(date.getTime())) {
+      const now = new Date();
-        return '';
+      const today = new Date(now.getFullYear(), now.getMonth(), now.getDate());
-      }
+      const yesterday = new Date(today.getTime() - 24 * 60 * 60 * 1000);
-      
+      const beforeYesterday = new Date(today.getTime() - 2 * 24 * 60 * 60 * 1000);
+
+      const msgDate = new Date(date.getFullYear(), date.getMonth(), date.getDate());
+
       const hours = date.getHours().toString().padStart(2, '0');
       const minutes = date.getMinutes().toString().padStart(2, '0');
-      const result = hours + ':' + minutes;
+      const timeStr = `${hours}:${minutes}`;
-      return result;
+
+      if (msgDate.getTime() === today.getTime()) {
+        return timeStr;
+      }
+      if (msgDate.getTime() === yesterday.getTime()) {
+        return `${this.$lang('timeFormatYesterday')} ${timeStr}`;
+      }
+      if (msgDate.getTime() === beforeYesterday.getTime()) {
+        return `${this.$lang('timeFormatBeforeYesterday')} ${timeStr}`;
+      }
+
+      const isCurrentYear = date.getFullYear() === now.getFullYear();
+      const monthStr = (date.getMonth() + 1).toString();
+      const dayStr = date.getDate().toString();
+
+      if (isCurrentYear) {
+        return `${monthStr}/${dayStr} ${timeStr}`;
+      }
+
+      const yearStr = date.getFullYear().toString();
+      return `${yearStr}/${monthStr}/${dayStr} ${timeStr}`;
     },
     
     // 格式化文件大小