fix: reduce long-poll timeout to 2s, make mark_as_seen async to unblock TG sender

src/tg_bot.py

@@ -86,8 +86,8 @@ def poll_telegram(tg_cfg: TelegramConfig, cfg: Config, last_update_id: int) -> i
     try:
         resp = requests.get(
             f"https://api.telegram.org/bot{tg_cfg.bot_token}/getUpdates",
-            params={"offset": last_update_id, "timeout": 5},
-            timeout=15,
+            params={"offset": last_update_id, "timeout": 2},
+            timeout=10,
         )
         resp.raise_for_status()
         data = resp.json()