fix(#424): fully fix logout→login cycle — clear ViewModel state + manage WS lifecycle (#429)

* fix(#424): fully fix logout→login cycle — clear ViewModel state + manage WS lifecycle

The previous fix (PR #427) fixed button responsiveness after logout
but left two issues that kept login-after-logout broken:

1. Stale ViewModel state — AuthLoginViewModel is Activity-scoped,
   so  stayed  from the first login. When
   the user returned to the login screen, LaunchedEffect fired
   instantly with the stale value and bounced them to ChatScreen
   without showing the form.

   Fix: DisposableEffect(onDispose) clears connectionSuccess,
   errorMessage, and isLoading when the screen leaves composition.

2. WebSocket lifecycle — logout() never disconnected the WS, so
   it stayed open with a null/stale token. After re-login, no one
   called connect() with the fresh credentials.

   Fix: HermesWsClient.disconnect() on logout,
   HermesWsClient.connect() after successful re-login.

* fix(#424): route landing screen clicks through navigateTo

Avoid direct backStack.add() calls to prevent duplicate screen overlay and unresponsive buttons.

* fix(#424): close drawer when gestures are disabled

Ensure the drawer is closed when transitioning to LandingScreen or LoginScreen to prevent the scrim overlay from intercepting clicks.

---------

Co-authored-by: M57 <hy4ri@users.noreply.github.com>

app/src/main/java/com/m57/hermescontrol/ui/settings/SettingsViewModel.kt

@@ -7,6 +7,7 @@ import com.m57.hermescontrol.data.local.AuthManager
 import com.m57.hermescontrol.data.remote.ApiClient
 import com.m57.hermescontrol.data.remote.NetworkResult
 import com.m57.hermescontrol.data.remote.safeApiCall
+import com.m57.hermescontrol.data.ws.HermesWsClient
 import com.m57.hermescontrol.theme.BottomNavDisplayMode
 import com.m57.hermescontrol.theme.ThemePreference
 import com.m57.hermescontrol.theme.ThemePreset
@@ -299,6 +300,7 @@ class SettingsViewModel(
         AuthManager.setToken(null)
         AuthManager.setSessionCookie(null)
         AuthManager.setWsAuthParam("token")
+        HermesWsClient.disconnect()
         // Don't rebuild ApiClient here — let the navigation complete first
     }