修复：重写本地清屏逻辑，使用 localStorage 记录拉取游标，避免进房带历史功能导致清屏失效

resources/views/chat/frame.blade.php

@@ -108,11 +108,16 @@
         <script>
             document.addEventListener('DOMContentLoaded', () => {
                 const historyMsgs = @json($historyMessages);
+                const clearId = parseInt(localStorage.getItem(`local_clear_msg_id_{{ $room->id }}`) || '0', 10);
+
                 if (historyMsgs && historyMsgs.length > 0) {
                     // 全局函数 appendMessage 在 scripts.blade.php 中定义
                     historyMsgs.forEach(msg => {
-                        if (typeof window.appendMessage === 'function') {
-                            window.appendMessage(msg);
+                        // 如果开启了本地清屏，之前的历史记录不再显示
+                        if (msg.id > clearId) {
+                            if (typeof window.appendMessage === 'function') {
+                                window.appendMessage(msg);
+                            }
                         }
                     });
                 }