feat(discord): implement typing indicator functionality

- Add methods to manage typing indicators in Discord channels.
- Introduce periodic typing notifications while sending messages.
- Ensure proper cleanup of typing tasks on channel closure.

nanobot/channels/discord.py

@@ -38,6 +38,7 @@ class DiscordChannel(BaseChannel):
         self._seq: int | None = None
         self._session_id: str | None = None
         self._heartbeat_task: asyncio.Task | None = None
+        self._typing_tasks: dict[str, asyncio.Task] = {}
         self._http: httpx.AsyncClient | None = None
         self._max_attachment_bytes = DEFAULT_MAX_ATTACHMENT_BYTES
 
@@ -70,6 +71,9 @@ class DiscordChannel(BaseChannel):
         if self._heartbeat_task:
             self._heartbeat_task.cancel()
             self._heartbeat_task = None
+        for task in self._typing_tasks.values():
+            task.cancel()
+        self._typing_tasks.clear()
         if self._ws:
             await self._ws.close()
             self._ws = None
@@ -92,22 +96,25 @@ class DiscordChannel(BaseChannel):
 
         headers = {"Authorization": f"Bot {self.config.token}"}
 
-        for attempt in range(3):
-            try:
-                response = await self._http.post(url, headers=headers, json=payload)
-                if response.status_code == 429:
-                    data = response.json()
-                    retry_after = float(data.get("retry_after", 1.0))
-                    logger.warning(f"Discord rate limited, retrying in {retry_after}s")
-                    await asyncio.sleep(retry_after)
-                    continue
-                response.raise_for_status()
-                return
-            except Exception as e:
-                if attempt == 2:
-                    logger.error(f"Error sending Discord message: {e}")
-                else:
-                    await asyncio.sleep(1)
+        try:
+            for attempt in range(3):
+                try:
+                    response = await self._http.post(url, headers=headers, json=payload)
+                    if response.status_code == 429:
+                        data = response.json()
+                        retry_after = float(data.get("retry_after", 1.0))
+                        logger.warning(f"Discord rate limited, retrying in {retry_after}s")
+                        await asyncio.sleep(retry_after)
+                        continue
+                    response.raise_for_status()
+                    return
+                except Exception as e:
+                    if attempt == 2:
+                        logger.error(f"Error sending Discord message: {e}")
+                    else:
+                        await asyncio.sleep(1)
+        finally:
+            await self._stop_typing(msg.chat_id)
 
     async def _gateway_loop(self) -> None:
         """Main gateway loop: identify, heartbeat, dispatch events."""
@@ -232,6 +239,8 @@ class DiscordChannel(BaseChannel):
         referenced = payload.get("referenced_message") or {}
         reply_to_id = referenced.get("id")
 
+        await self._start_typing(channel_id)
+
         await self._handle_message(
             sender_id=sender_id,
             chat_id=channel_id,
@@ -250,3 +259,31 @@ class DiscordChannel(BaseChannel):
                 "reply_to": reply_to_id,
             },
         )
+
+    async def _send_typing(self, channel_id: str) -> None:
+        """Send a typing indicator to Discord."""
+        if not self._http:
+            return
+        url = f"{DISCORD_API_BASE}/channels/{channel_id}/typing"
+        headers = {"Authorization": f"Bot {self.config.token}"}
+        try:
+            await self._http.post(url, headers=headers)
+        except Exception as e:
+            logger.debug(f"Discord typing indicator failed: {e}")
+
+    async def _start_typing(self, channel_id: str) -> None:
+        """Start periodic typing indicator for a channel."""
+        await self._stop_typing(channel_id)
+
+        async def typing_loop() -> None:
+            while self._running:
+                await self._send_typing(channel_id)
+                await asyncio.sleep(8)
+
+        self._typing_tasks[channel_id] = asyncio.create_task(typing_loop())
+
+    async def _stop_typing(self, channel_id: str) -> None:
+        """Stop typing indicator for a channel."""
+        task = self._typing_tasks.pop(channel_id, None)
+        if task:
+            task.cancel()