fix: add error handling and tests for WA Web version fetch

The fetchLatestWaWebVersion call added in #443 could crash the
connection flow if the HTTP fetch fails. Wrap with .catch() to log
and fall back to the default Baileys version.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/whatsapp-auth.ts

@@ -54,7 +54,10 @@ async function connectSocket(phoneNumber?: string, isReconnect = false): Promise
     process.exit(0);
   }
 
-  const { version } = await fetchLatestWaWebVersion({});
+  const { version } = await fetchLatestWaWebVersion({}).catch((err) => {
+    logger.warn({ err }, 'Failed to fetch latest WA Web version, using default');
+    return { version: undefined };
+  });
   const sock = makeWASocket({
     version,
     auth: {