修复：后台恢复时消息暴刷，只渲染最后50条并插入省略提示

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;
+    const checkEnd = () => {
+        if (Date.now() >= endTime) {
             autoFishCooldownTimer = null;
             hideAutoFishStopButton();
-
             if (autoFishing) {
                 void startFishing();
             }
-    }, cooldown * 1000);
+            return;
+        }
+        autoFishCooldownTimer = window.setTimeout(checkEnd, 200);
+    };
+    autoFishCooldownTimer = window.setTimeout(checkEnd, Math.min(cooldown * 1000, 200));
 }
 
 /**

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

@@ -457,6 +457,9 @@ export function enqueueChatMessage(msg) {
     state.chatMessageFlushTimer = scheduleFlush(flushQueuedChatMessages);
 }
 
+/** 后台恢复时公屏最大渲染条数，避免暴刷 */
+const MAX_BURST_RENDER = 50;
+
 /**
  * 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 +469,23 @@ export function flushQueuedChatMessages() {
 
     state.chatMessageFlushTimer = null;
 
+    // 大批量消息堆积（后台标签页恢复）时，丢弃早于 MAX_BURST_RENDER 的消息，
+    // 插入一条省略提示，避免用户一回来就看到满屏消息狂刷。
+    if (state.pendingChatMessages.length > MAX_BURST_RENDER + 20) {
+        const skipped = state.pendingChatMessages.length - MAX_BURST_RENDER;
+        state.pendingChatMessages.splice(0, skipped);
+
+        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 ${skipped} 条未读消息`;
+            container.appendChild(notice);
+        }
+    }
+
     const batch = state.pendingChatMessages.splice(0, CHAT_MESSAGE_FLUSH_BATCH_SIZE);
     const renderBatch = createChatMessageRenderBatch();
     batch.forEach((msg) => appendMessage(msg, renderBatch));