onChannelPushPreferenceSet
open suspend override fun onChannelPushPreferenceSet(cid: String, level: PushPreferenceLevel, result: Result<PushPreference>)
Called when the push notification preference is updated for a given channel.
Parameters
cid
The full channel ID (e.g., "messaging:123").
level
The level at which the preference is set (user, channel, or channel group).
result
The result of the update operation, containing the updated PushPreference on success or an error on failure.