fix: open the dedicated Reddit Chat host

tests/reddit-session-exporter.test.ts

@@ -2,8 +2,13 @@ import { describe, expect, it } from 'vitest';
 import {
   assertMatchingSessionIdentity,
   createSessionExportDownload,
+  REDDIT_CHAT_URL,
 } from '../extensions/reddit-session-exporter/session-export.js';
 
+it('uses the dedicated Reddit Chat host for Matrix credential capture', () => {
+  expect(REDDIT_CHAT_URL).toBe('https://chat.reddit.com/');
+});
+
 describe('createSessionExportDownload', () => {
   it('creates a JSON data URL that Chrome can download from a service worker', () => {
     const download = createSessionExportDownload([