refactor: replace string-based route with typed Enum in RadioConfigState

- Change RadioConfigState.route from String to Enum<*>?
- ChannelScreen resolves navigation target via typed cast instead of
  string lookup through getNavRouteFrom()
- Delete dead SettingsNavUtils.kt (getNavRouteFrom now unused)
- Eliminates fragile string→enum round-trip that could silently fail

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

feature/settings/src/commonMain/kotlin/org/meshtastic/feature/settings/navigation/SettingsNavUtils.kt

@@ -1,22 +0,0 @@
-/*
- * Copyright (c) 2026 Meshtastic LLC
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-package org.meshtastic.feature.settings.navigation
-
-import org.meshtastic.core.navigation.Route
-
-fun getNavRouteFrom(routeName: String): Route? =
-    ConfigRoute.entries.find { it.name == routeName }?.route ?: ModuleRoute.entries.find { it.name == routeName }?.route

feature/settings/src/commonMain/kotlin/org/meshtastic/feature/settings/radio/RadioConfigViewModel.kt

@@ -89,7 +89,7 @@ import org.meshtastic.core.model.ResponseState
 data class RadioConfigState(
     val isLocal: Boolean = false,
     val connected: Boolean = false,
-    val route: String = "",
+    val route: Enum<*>? = null,
     val metadata: DeviceMetadata? = null,
     val userConfig: User = User(),
     val channelList: List<ChannelSettings> = emptyList(),
@@ -385,7 +385,7 @@ open class RadioConfigViewModel(
             .stateIn(viewModelScope, SharingStarted.WhileSubscribed(5_000), ResponseState.Empty)
 
     override val pendingRouteName: StateFlow<String> =
-        _radioConfigState.map { it.route }
+        _radioConfigState.map { it.route?.name.orEmpty() }
             .stateIn(viewModelScope, SharingStarted.WhileSubscribed(5_000), "")
 
     override fun requestConfigLoad(routeName: String) {
@@ -404,7 +404,7 @@ open class RadioConfigViewModel(
     fun setResponseStateLoading(route: Enum<*>) {
         val destNum = destNumFlow.value ?: destNode.value?.num ?: return
 
-        _radioConfigState.update { it.copy(route = route.name, responseState = ResponseState.Loading()) }
+        _radioConfigState.update { it.copy(route = route, responseState = ResponseState.Loading()) }
 
         loadJob?.cancel()
         loadJob = viewModelScope.launch {

feature/settings/src/commonMain/kotlin/org/meshtastic/feature/settings/radio/channel/ChannelScreen.kt

@@ -93,7 +93,7 @@ import org.meshtastic.core.ui.util.rememberQrCodePainter
 import org.meshtastic.core.ui.util.rememberShowToastResource
 import org.meshtastic.feature.settings.channel.ChannelViewModel
 import org.meshtastic.feature.settings.navigation.ConfigRoute
-import org.meshtastic.feature.settings.navigation.getNavRouteFrom
+import org.meshtastic.feature.settings.navigation.ModuleRoute
 import org.meshtastic.feature.settings.radio.RadioConfigViewModel
 import org.meshtastic.core.ui.component.PacketResponseStateDialog
 import org.meshtastic.proto.ChannelSet
@@ -140,10 +140,12 @@ fun ChannelScreen(
                 radioConfigViewModel.clearPacketResponse()
             },
             onComplete = {
-                getNavRouteFrom(radioConfigState.route)?.let { route ->
+                val navRoute = (radioConfigState.route as? ConfigRoute)?.route
+                    ?: (radioConfigState.route as? ModuleRoute)?.route
+                if (navRoute != null) {
                     isWaiting = false
                     radioConfigViewModel.clearPacketResponse()
-                    onNavigate(route)
+                    onNavigate(navRoute)
                 }
             },
         )