fix: improve type safety and add error logging (#378)

- Replace 'as any' with proper type definition for error status code access
- Add error logging to sendPresenceUpdate() catch block
- Add debug logging when .env file is not found

These changes improve type safety and visibility into potential failures
without changing any core functionality.

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: gavrielc <gabicohen22@yahoo.com>

src/channels/whatsapp.ts

@@ -80,7 +80,7 @@ export class WhatsAppChannel implements Channel {
 
       if (connection === 'close') {
         this.connected = false;
-        const reason = (lastDisconnect?.error as any)?.output?.statusCode;
+        const reason = (lastDisconnect?.error as { output?: { statusCode?: number } })?.output?.statusCode;
         const shouldReconnect = reason !== DisconnectReason.loggedOut;
         logger.info({ reason, shouldReconnect, queuedMessages: this.outgoingQueue.length }, 'Connection closed');
 
@@ -103,7 +103,9 @@ export class WhatsAppChannel implements Channel {
         logger.info('Connected to WhatsApp');
 
         // Announce availability so WhatsApp relays subsequent presence updates (typing indicators)
-        this.sock.sendPresenceUpdate('available').catch(() => {});
+        this.sock.sendPresenceUpdate('available').catch((err) => {
+          logger.warn({ err }, 'Failed to send presence update');
+        });
 
         // Build LID to phone mapping from auth state for self-chat translation
         if (this.sock.user) {

src/env.ts

@@ -1,5 +1,6 @@
 import fs from 'fs';
 import path from 'path';
+import { logger } from './logger.js';
 
 /**
  * Parse the .env file and return values for the requested keys.
@@ -12,7 +13,8 @@ export function readEnvFile(keys: string[]): Record<string, string> {
   let content: string;
   try {
     content = fs.readFileSync(envFile, 'utf-8');
-  } catch {
+  } catch (err) {
+    logger.debug({ err }, '.env file not found, using defaults');
     return {};
   }