fix: pass chat_action from target config to Telegram client

chat_action was stored on NotificationTarget model but never injected
into the config dict passed to the dispatcher. Now injected in both
watcher and webhook handler, and read by the dispatcher to pass to
TelegramClient.send_notification().

packages/core/src/notify_bridge_core/notifications/dispatcher.py

@@ -105,6 +105,7 @@ class NotificationDispatcher:
     ) -> dict[str, Any]:
         bot_token = target.config.get("bot_token")
         disable_preview = target.config.get("disable_url_preview", False)
+        chat_action = target.config.get("chat_action", "typing")
         max_media = target.config.get("max_media_to_send", 50)
         max_group = target.config.get("max_media_per_group", 10)
         chunk_delay = target.config.get("media_delay", 500)
@@ -172,6 +173,7 @@ class NotificationDispatcher:
                         chunk_delay=chunk_delay,
                         max_asset_data_size=max_size,
                         send_large_photos_as_documents=send_large_as_docs,
+                        chat_action=chat_action or None,
                     )
                     if not media_result.get("success"):
                         _LOGGER.warning("Text sent OK but media failed for chat %s: %s", chat_id, media_result.get("error"))