feat: 更新背景脚本和内容脚本，添加录制控制消息处理，优化录制状态检查逻辑，新增消息常量

entrypoints/background.ts

@@ -1,27 +1,65 @@
 export default defineBackground(() => {
   console.log('Hello background!', { id: browser.runtime.id });
 
-  chrome.runtime.onMessage.addListener(async (msg, sender, sendResponse) => {
-    if (msg.type === 'CREATE_OFFSCREEN') {
-      const exists = await chrome.offscreen.hasDocument();
-      if (!exists) {
-        await chrome.offscreen.createDocument({
-          url: 'offscreen.html',
-          reasons: ['DISPLAY_MEDIA', 'USER_MEDIA', 'BLOBS', 'AUDIO_PLAYBACK'],
-          justification: 'rrweb record & replay',
-        });
-        console.log('[bg] offscreen created');
+  browser.runtime.onInstalled.addListener(async ({ reason }) => {
+    if (reason === 'install') {
+      // 第一次安装扩展时触发
+      console.log('Extension installed for the first time');
+    } else if (reason === 'update') {
+      // 扩展更新时触发
+      console.log('Extension updated to a new version');
+    }
+
+    // 给所有已打开的标签页注入 content script
+    for (const tab of await browser.tabs.query({})) {
+      if (tab.url?.match(/(chrome|chrome-extension):\/\//gi) || !tab.id) {
+        continue;
       }
+
+      // 注入 content script
+      const res = browser.scripting.executeScript({
+        target: { tabId: tab.id },
+        files: ['/content-scripts/content.js'],
+      });
+      console.log('Content script injected on installed/updated:', res);
+    }
+  });
+
+  chrome.runtime.onMessage.addListener((msg, sender, sendResponse) => {
+    // 处理来自其他部分的消息
+    console.log('[bg] message received:', msg, sender.tab);
+
+    chrome.tabs.query({ active: true, currentWindow: true }, (tabs) => {
+      const currentTab = tabs[0];
+      console.log('[bg] 真正活跃的页面标题是:', currentTab?.title);
+      sendResponse({ ok: true, title: currentTab?.title });
+    });
+
+    if (msg.type === 'CREATE_OFFSCREEN') {
+      console.log('[bg] offscreen created');
       sendResponse({ ok: true });
     }
 
     if (msg.type === 'DOWNLOAD') {
       console.log('[bg] DOWNLOAD received');
-      chrome.downloads.download({
-        url: msg.dataUrl,
-        filename: `rrweb-${Date.now()}.json`,
-        saveAs: true,
-      });
+      sendResponse({ ok: true });
     }
+
+    return true;
   });
+
+  async function sendToActiveTab(message: {
+    type: string;
+    data?: any;
+    activeTabId?: number;
+    [key: string]: any;
+  }) {
+    let activeTabs = await browser.tabs.query({
+      active: true,
+      currentWindow: true,
+    });
+    let activeTab = activeTabs[0];
+    const sendTo = message.activeTabId || activeTab.id;
+    await browser.tabs.sendMessage(sendTo!, message);
+  }
 });