fix(wrappers): guard against undefined Browser.cookies in getChatGptAccessToken

In some browser contexts (e.g. Safari, or environments where the cookies
permission is unavailable), Browser.cookies can be undefined, causing:
  "can't access property 'getAll', a.cookies is undefined"

chatgpt-web.mjs already uses this guard pattern. Apply the same
defensive check before calling Browser.cookies.getAll in
getChatGptAccessToken, allowing the session endpoint to be reached
without cookies when the API is unavailable.

Fixes #912

Co-Authored-By: Octopus <liyuan851277048@icloud.com>

Author: octo-patch

src/services/wrappers.mjs

@@ -15,11 +15,14 @@ export async function getChatGptAccessToken() {
   if (userConfig.accessToken) {
     return userConfig.accessToken
   } else {
-    const cookie = (await Browser.cookies.getAll({ url: 'https://chatgpt.com/' }))
-      .map((cookie) => {
-        return `${cookie.name}=${cookie.value}`
-      })
-      .join('; ')
+    let cookie = ''
+    if (Browser.cookies && Browser.cookies.getAll) {
+      cookie = (await Browser.cookies.getAll({ url: 'https://chatgpt.com/' }))
+        .map((cookie) => {
+          return `${cookie.name}=${cookie.value}`
+        })
+        .join('; ')
+    }
     const resp = await fetch('https://chatgpt.com/api/auth/session', {
       headers: {
         Cookie: cookie,