feat: 插件改为浮窗模式

extension/entrypoints/background.ts

@@ -4,8 +4,15 @@ import { generateSuite, getSuite, planSuite } from '../src/api/client';
 export default defineBackground(() => {
   console.log('[电商套图工作台] background started');
 
-  // 点击扩展图标 → 打开 Side Panel
-  chrome.sidePanel.setPanelBehavior({ openPanelOnActionClick: true });
+  // 点击扩展图标 → 开关当前商品页的悬浮面板（页面无 content script 时忽略）
+  chrome.action.onClicked.addListener(async (tab) => {
+    if (tab.id == null) return;
+    try {
+      await chrome.tabs.sendMessage(tab.id, { action: 'toggle-suite-panel' });
+    } catch {
+      // 非四站点页面，未注入面板
+    }
+  });
 
   chrome.runtime.onMessage.addListener((msg, _sender, sendResponse) => {
     if (msg?.action === 'generateSuite') {