fix: verify stored sessions from a Reddit page

src/browser/client.ts

@@ -133,7 +133,14 @@ export class BrowserClient {
   /** Returns the username and stable t2 account ID for identity binding. */
   async getAuthenticatedIdentity(): Promise<RedditAccountIdentity | null> {
     try {
-      return await this.getRedditIdentity(await this.getPage());
+      const page = await this.getPage();
+      if (!isRedditPage(page.url())) {
+        await page.goto('https://www.reddit.com', {
+          waitUntil: 'domcontentloaded',
+          timeout: 30000,
+        });
+      }
+      return await this.getRedditIdentity(page);
     } catch {
       return null;
     }
@@ -212,3 +219,12 @@ export class BrowserClient {
   }
 
 }
+
+function isRedditPage(value: string): boolean {
+  try {
+    const hostname = new URL(value).hostname.toLowerCase();
+    return hostname === 'reddit.com' || hostname.endsWith('.reddit.com');
+  } catch {
+    return false;
+  }
+}