enhance shift function

globals.js

@@ -1,23 +1,39 @@
-if (typeof window.globalsLoaded === 'undefined') {
-    console.log('globals.js loaded');
+if (typeof window.globalsLoaded === "undefined") {
+  console.log("globals.js loaded");
 
-    window.globalsLoaded = true;
+  window.globalsLoaded = true;
 
-    let Selectors = {
-        // Plus 用户的选择器
-        conversationsCheckbox: '.conversation-checkbox:checked',
-        confirmDeleteButton: 'button.btn.btn-danger',
-        threeDotButton: '[id^="radix-"]',
-        // 其他 Plus 用户选择器...
-        CONVERSATION_SELECTOR: 'div > div > div > div > div > div > nav > div > div > div > div > ol > li > div > a',
-        TITLE_SELECTOR: '.relative.grow.overflow-hidden.whitespace-nowrap',
-    };
+  const Selectors = {
+    conversationsCheckbox: ".conversation-checkbox:checked",
+    confirmDeleteButton: "button.btn.btn-danger",
+    threeDotButton: '[id^="radix-"]',
+    CONVERSATION_SELECTOR:
+      "div > div > div > div > div > div > nav > div > div > div > div > ol > li > div > a",
+    TITLE_SELECTOR: ".relative.grow.overflow-hidden.whitespace-nowrap",
+  };
 
-    let CHECKBOX_CLASS = 'conversation-checkbox';
+  const CHECKBOX_CLASS = "conversation-checkbox";
 
-    window.shiftPressed = false;
-    window.Selectors = Selectors;
-    window.CHECKBOX_CLASS = CHECKBOX_CLASS;
+  // Define getUserInfo function
+  function getUserInfo() {
+    return new Promise((resolve, reject) => {
+      chrome.runtime.sendMessage({ action: "getUserInfo" }, (response) => {
+        if (chrome.runtime.lastError) {
+          reject(chrome.runtime.lastError);
+        } else if (response.error) {
+          reject(new Error(response.error));
+        } else {
+          resolve(response.userInfo);
+        }
+      });
+    });
+  }
+
+  // Expose variables to the global scope
+  window.Selectors = Selectors;
+  window.shiftPressed = false;
+  window.lastCheckedCheckbox = null;
+  window.CHECKBOX_CLASS = CHECKBOX_CLASS;
 } else {
-    console.log('globals.js already loaded, skipping re-initialization');
-}
+  console.log("globals.js already loaded, skipping re-initialization");
+}