fix: address final review findings for provider migration

- Add SessionCoordinator regression test covering switch from an
  authenticated ABox profile to Local experience: remote session is
  logged out and cleared, only Local is the active/observable session,
  credentials are cleared, auto-login disabled, and gateway state stays
  isolated (verified to fail when switch cleanup is removed).
- Replace if/else provider dispatch with exhaustive when over
  ProviderType in all three routing gateways so future enum additions
  fail compilation.
- Silence the known ExperimentalCoroutinesApi opt-in warning in
  ProviderSelectionViewModelTest with a class-level @OptIn.

android/app/src/main/kotlin/com/flagship/abox/manager/di/ProviderRoutingGateways.kt

@@ -71,8 +71,10 @@ internal class RoutingSocketGateway(
         is DomainResult.Success -> delegate(provider.value).setPower(profileId, deviceName, powerState)
     }
 
-    private fun delegate(type: ProviderType): SocketGateway =
-        if (type == ProviderType.ABOX) real else simulation
+    private fun delegate(type: ProviderType): SocketGateway = when (type) {
+        ProviderType.ABOX -> real
+        ProviderType.LOCAL_EXPERIENCE -> simulation
+    }
 }
 
 /** Routes temperature/humidity operations by active provider, mirroring [RoutingSocketGateway]. */
@@ -91,8 +93,10 @@ internal class RoutingTemperatureHumidityGateway(
         is DomainResult.Success -> delegate(provider.value).getReading(profileId, deviceName)
     }
 
-    private fun delegate(type: ProviderType): TemperatureHumidityGateway =
-        if (type == ProviderType.ABOX) real else simulation
+    private fun delegate(type: ProviderType): TemperatureHumidityGateway = when (type) {
+        ProviderType.ABOX -> real
+        ProviderType.LOCAL_EXPERIENCE -> simulation
+    }
 }
 
 /** Routes infrared operations by active provider, mirroring [RoutingSocketGateway]. */
@@ -129,6 +133,8 @@ internal class RoutingInfraredGateway(
         is DomainResult.Success -> delegate(provider.value).downloadCodes(profileId, codes)
     }
 
-    private fun delegate(type: ProviderType): InfraredGateway =
-        if (type == ProviderType.ABOX) real else simulation
+    private fun delegate(type: ProviderType): InfraredGateway = when (type) {
+        ProviderType.ABOX -> real
+        ProviderType.LOCAL_EXPERIENCE -> simulation
+    }
 }

android/app/src/test/kotlin/com/flagship/abox/manager/ui/provider/ProviderSelectionViewModelTest.kt

@@ -7,6 +7,7 @@ import com.flagship.abox.manager.testing.fakes.FakeCredentialStore
 import com.flagship.abox.manager.testing.fakes.FakeLocalSessionGateway
 import com.flagship.abox.manager.testing.fakes.FakeProviderProfileStore
 import com.flagship.abox.manager.testing.fakes.FakeSessionGateway
+import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.test.advanceUntilIdle
 import kotlinx.coroutines.test.runTest
@@ -14,6 +15,7 @@ import org.junit.Assert.assertEquals
 import org.junit.Rule
 import org.junit.Test
 
+@OptIn(ExperimentalCoroutinesApi::class)
 class ProviderSelectionViewModelTest {
     @get:Rule
     val mainDispatcherRule = MainDispatcherRule()