* refactor: remove device Pairing feature entirely (issue #645) - Delete Pairing.kt model + pairing API endpoints (get/approve/revoke/clear) - Delete PairingScreen/PairingViewModel + PairingCodeEntryScreen/ViewModel - Remove NavKeys, ScreenRegistry drawer entry, Navigation.kt entry + Landing pairing button - Remove pairing string resources (en + ko); keep connect_* config-parse strings - Keep Telegram onboarding pairing_id flow (separate concept, per issue) - Fix related doc comments + remaining test reference * test: fix racy CONNECTED read in gated-mode WS test (issue #635 test) testGatedMode_attemptsTicketFetchWithoutBareCookie asserted CONNECTED immediately after the server-side onOpen latch fired, racing the client handshake (WsListenerImpl sets CONNECTED on receipt of the 101). Await the real status transition via connectionStatus.first{==CONNECTED} like the other connect tests do. No product behavior changed. --------- Co-authored-by: M57 <Hy4ri@users.noreply.github.com>