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/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);