httpx timeout exceptions (ReadTimeout, WriteTimeout) stringify to "",
which defeats _is_timeout_error's first-line guard (if not error: return
False). The base-layer plain-text fallback then re-sends an already-
delivered message — the user receives it twice.
Replace error=str(exc) with error=str(exc) or type(exc).__name__ at every
httpx-based adapter boundary so the existing matcher ("readtimeout",
"writetimeout") still fires. ConnectTimeout intentionally stays
unmatched: if the connection never opened the message was not delivered,
so retry/fallback remains correct.
Applies to BlueBubbles (send + _create_chat_for_handle), WhatsApp Cloud
(text + interactive + media), QQ Bot (send chunk + keyboard + media), and
Yuanbao media handler — the same latent bug exists in every adapter that
stores error=str(exc) from an httpx call.
Tranquil-Flow
6cbb7b6115