修复：后台恢复时只省略过时的系统/游戏通知，保留用户聊天记录

resources/js/chat-room/fishing.js

@@ -200,34 +200,41 @@ function setFishingButton(text, disabled) {
 }
 
 /**
- * 启动自动钓鱼冷却倒计时。
+ * 启动自动钓鱼冷却倒计时（基于时间戳，不受浏览器后台节流影响）。
  *
- * @param {number} cooldown
+ * @param {number} cooldown 冷却秒数
  * @returns {void}
  */
 function startAutoFishingCooldown(cooldown) {
-    let remaining = cooldown;
+    const endTime = Date.now() + cooldown * 1000;
-    setFishingButton(`⏳ 冷却 ${remaining}s`, true);
+    setFishingButton(`⏳ 冷却 ${cooldown}s`, true);
     showAutoFishStopButton(cooldown);
 
+    // 基于时间戳更新倒计时 UI — 后台节流后回来也能准确显示
     autoFishCooldownCountdown = window.setInterval(() => {
-        remaining -= 1;
+        const remaining = Math.max(0, Math.ceil((endTime - Date.now()) / 1000));
         setFishingButton(`⏳ 冷却 ${remaining}s`, true);
 
         if (remaining <= 0) {
             window.clearInterval(autoFishCooldownCountdown);
             autoFishCooldownCountdown = null;
         }
-    }, 1000);
+    }, 200);
 
-    autoFishCooldownTimer = window.setTimeout(() => {
+    // 基于时间戳检测冷却结束 — 后台节流后立即触发
-        autoFishCooldownTimer = null;
+    autoFishCooldownTimer = null;
-        hideAutoFishStopButton();
+    const checkEnd = () => {
-
+        if (Date.now() >= endTime) {
-        if (autoFishing) {
+            autoFishCooldownTimer = null;
-            void startFishing();
+            hideAutoFishStopButton();
+            if (autoFishing) {
+                void startFishing();
+            }
+            return;
         }
-    }, cooldown * 1000);
+        autoFishCooldownTimer = window.setTimeout(checkEnd, 200);
+    };
+    autoFishCooldownTimer = window.setTimeout(checkEnd, Math.min(cooldown * 1000, 200));
 }
 
 /**

resources/js/chat-room/message-renderer.js

@@ -457,6 +457,23 @@ export function enqueueChatMessage(msg) {
     state.chatMessageFlushTimer = scheduleFlush(flushQueuedChatMessages);
 }
 
+/**
+ * 判断是否为普通用户聊天消息（非系统/游戏通知）。
+ */
+function isUserChatMessage(msg) {
+    if (!msg || !msg.from_user) return false;
+    const u = msg.from_user;
+    if (SYSTEM_USERS.includes(u)) return false;
+    if (u.endsWith("播报")) return false;
+    if (u === "百家乐" || u === "跑马") return false;
+    return true;
+}
+
+/** 后台恢复时系统通知最多保留条数 */
+const MAX_SYSTEM_BURST = 20;
+/** 后台恢复时超过该时间的系统通知直接丢弃（分钟） */
+const MAX_SYSTEM_AGE_MINUTES = 10;
+
 /**
  * 分批渲染待处理消息，给动画、输入和滚动留出主线程时间。
  */
@@ -466,6 +483,55 @@ export function flushQueuedChatMessages() {
 
     state.chatMessageFlushTimer = null;
 
+    // 大批量消息堆积（后台标签页恢复）时，保留所有用户聊天记录，
+    // 但过时的系统/游戏通知只保留最近 MAX_SYSTEM_BURST 条。
+    if (state.pendingChatMessages.length > MAX_SYSTEM_BURST + 30) {
+        const now = Date.now();
+        const maxAge = MAX_SYSTEM_AGE_MINUTES * 60 * 1000;
+        const totalSystem = state.pendingChatMessages.filter((m) => !isUserChatMessage(m)).length;
+        let systemSeen = 0;
+        let dropped = 0;
+
+        const filtered = state.pendingChatMessages.filter((msg) => {
+            if (isUserChatMessage(msg)) return true;
+
+            systemSeen++;
+
+            // 超过10分钟的系统通知直接丢弃
+            let msgTime = 0;
+            if (msg.sent_at) {
+                msgTime = new Date(msg.sent_at.replace(" ", "T")).getTime();
+            }
+            if (msgTime > 0 && now - msgTime > maxAge) {
+                dropped++;
+                return false;
+            }
+
+            // 从旧到新遍历，只保留最后 MAX_SYSTEM_BURST 条系统通知
+            const remainingAfter = totalSystem - systemSeen;
+            if (remainingAfter >= MAX_SYSTEM_BURST) {
+                dropped++;
+                return false;
+            }
+
+            return true;
+        });
+
+        if (dropped > 0) {
+            const container = state.container;
+            if (container) {
+                const notice = document.createElement("div");
+                notice.className = "msg-line msg-burst-notice";
+                notice.style.cssText =
+                    "text-align:center;padding:6px 0;margin:4px 0;font-size:12px;color:#94a3b8;border-top:1px dashed #d1d5db;border-bottom:1px dashed #d1d5db;";
+                notice.textContent = `⏫ 省略了 ${dropped} 条系统通知`;
+                container.appendChild(notice);
+            }
+        }
+
+        state.pendingChatMessages = filtered;
+    }
+
     const batch = state.pendingChatMessages.splice(0, CHAT_MESSAGE_FLUSH_BATCH_SIZE);
     const renderBatch = createChatMessageRenderBatch();
     batch.forEach((msg) => appendMessage(msg, renderBatch));