Connection probe requests in testConnectionWithLatency were sent without
X-Plex-Client-Identifier, X-Plex-Product, or X-Plex-Device-Name headers.
Plex treated each anonymous probe as a new unknown device and fired a
"New Device" notification for every server tested (one per shared/owned
server), while displaying "Flutter" as the device name from the HTTP
user-agent.
Pass clientIdentifier through findBestWorkingConnection and all connection
test helpers so every probe request identifies itself as "Plezy" with the
persistent client UUID. This prevents spurious notifications and ensures
the device shows the correct app name in Plex's device list.
https://claude.ai/code/session_01V5VraujkNmk5GGPLyZ33fN
Matt Vogel
e9218e0a3d