Refine typing indicator behavior in message handling

- Adjusted the `_keep_typing` method to refresh the typing indicator every 2 seconds instead of 4, improving responsiveness after progress messages.
- Updated the `GatewayRunner` to restore the typing indicator after sending progress messages, enhancing user experience during message processing.

gateway/platforms/base.py

@@ -172,11 +172,12 @@ class BasePlatformAdapter(ABC):
         """
         pass
     
-    async def _keep_typing(self, chat_id: str, interval: float = 4.0) -> None:
+    async def _keep_typing(self, chat_id: str, interval: float = 2.0) -> None:
         """
         Continuously send typing indicator until cancelled.
         
-        Telegram/Discord typing status expires after ~5 seconds, so we refresh every 4.
+        Telegram/Discord typing status expires after ~5 seconds, so we refresh every 2
+        to recover quickly after progress messages interrupt it.
         """
         try:
             while True:

gateway/run.py

@@ -414,7 +414,9 @@ class GatewayRunner:
                     # Non-blocking check with small timeout
                     msg = progress_queue.get_nowait()
                     await adapter.send(chat_id=source.chat_id, content=msg)
-                    await asyncio.sleep(0.5)  # Small delay between messages
+                    # Restore typing indicator after sending progress message
+                    await asyncio.sleep(0.3)
+                    await adapter.send_typing(source.chat_id)
                 except queue.Empty:
                     await asyncio.sleep(0.3)  # Check again soon
                 except asyncio.CancelledError: