* fix(feishu): skip typing indicator keepalive re-adds to prevent notification spam
The typing keepalive loop calls addTypingIndicator() every 3 seconds,
which creates a new messageReaction.create API call each time. Feishu
treats each re-add as a new reaction event and fires a push notification,
causing users to receive repeated notifications while waiting for a
response.
Unlike Telegram/Discord where typing status expires after a few seconds,
Feishu reactions persist until explicitly removed. Skip the keepalive
re-add when a reaction already exists (reactionId is set) since there
is no need to refresh it.
Closes#28660
* Changelog: note Feishu typing keepalive suppression
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Co-authored-by: yuxh1996 <yuxh1996@users.noreply.github.com>
Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>
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