refactor: remove device Pairing feature entirely (issue #645) (#650)

* 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.

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Co-authored-by: M57 <Hy4ri@users.noreply.github.com>

app/src/main/java/com/m57/hermescontrol/ui/common/HermesScaffold.kt

@@ -102,7 +102,7 @@ val LocalDrawerGestureController =
 /**
  * Opt out of drawer gestures for a screen that does NOT use [HermesScaffold].
  *
- * Used by full-bleed entry screens (Landing, AuthLogin, PairingCodeEntry) that
+ * Used by full-bleed entry screens (Landing, AuthLogin) that
  * render their own layout. Scaffold-based screens should instead pass
  * `drawerGesturesEnabled = false` to [HermesScaffold].
  */

app/src/main/java/com/m57/hermescontrol/ui/common/StateViews.kt

@@ -193,7 +193,7 @@ fun EmptyState(
 // Skeleton loaders for list screens. Replaces bare `CircularProgressIndicator`
 // in list screens to (1) reduce perceived latency (~2× per NN/g research)
 // and (2) eliminate layout shift when real content lands. Pair with
-// `LoadingState()` for centered/one-shot contexts (Pairing flow, dialog
+// `LoadingState()` for centered/one-shot contexts (one-shot flows, dialog
 // interiors) where a spinner is still appropriate.
 
 /**