fix: typing indicator now shows on every message, not just the first

Two issues fixed:
- Use 'paused' instead of 'available' to stop typing. Baileys'
  sendPresenceUpdate('available') sends a global <presence> stanza and
  ignores the JID, so chatstate never left 'composing' and WhatsApp
  suppressed duplicate composing notifications per XEP-0085.
- Add setTyping call when piping messages to an already-running
  container. Previously only the first message (which spawns a new
  container) triggered the typing indicator.

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

src/channels/whatsapp.test.ts

@@ -823,14 +823,14 @@ describe('WhatsAppChannel', () => {
       expect(fakeSocket.sendPresenceUpdate).toHaveBeenCalledWith('composing', 'test@g.us');
     });
 
-    it('sends available presence when stopping', async () => {
+    it('sends paused presence when stopping', async () => {
       const opts = createTestOpts();
       const channel = new WhatsAppChannel(opts);
 
       await connectChannel(channel);
 
       await channel.setTyping('test@g.us', false);
-      expect(fakeSocket.sendPresenceUpdate).toHaveBeenCalledWith('available', 'test@g.us');
+      expect(fakeSocket.sendPresenceUpdate).toHaveBeenCalledWith('paused', 'test@g.us');
     });
 
     it('handles typing indicator failure gracefully', async () => {

src/channels/whatsapp.ts

@@ -218,7 +218,9 @@ export class WhatsAppChannel implements Channel {
 
   async setTyping(jid: string, isTyping: boolean): Promise<void> {
     try {
-      await this.sock.sendPresenceUpdate(isTyping ? 'composing' : 'available', jid);
+      const status = isTyping ? 'composing' : 'paused';
+      logger.debug({ jid, status }, 'Sending presence update');
+      await this.sock.sendPresenceUpdate(status, jid);
     } catch (err) {
       logger.debug({ jid, err }, 'Failed to update typing status');
     }

src/index.ts

@@ -360,6 +360,8 @@ async function startMessageLoop(): Promise<void> {
             lastAgentTimestamp[chatJid] =
               messagesToSend[messagesToSend.length - 1].timestamp;
             saveState();
+            // Show typing indicator while the container processes the piped message
+            whatsapp.setTyping(chatJid, true);
           } else {
             // No active container — enqueue for a new one
             queue.enqueueMessageCheck(chatJid);