feat: Implement iOS support and unify Compose Multiplatform infrastructure (#4876)

feature/map/src/androidMain/kotlin/org/meshtastic/feature/map/navigation/MapMainScreen.kt

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2025-2026 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.map.navigation
+
+import androidx.compose.runtime.Composable
+import org.koin.compose.viewmodel.koinViewModel
+import org.meshtastic.feature.map.MapScreen
+import org.meshtastic.feature.map.SharedMapViewModel
+
+@Composable
+actual fun MapMainScreen(onClickNodeChip: (Int) -> Unit, navigateToNodeDetails: (Int) -> Unit, waypointId: Int?) {
+    val viewModel = koinViewModel<SharedMapViewModel>()
+    MapScreen(
+        viewModel = viewModel,
+        onClickNodeChip = onClickNodeChip,
+        navigateToNodeDetails = navigateToNodeDetails,
+        waypointId = waypointId,
+    )
+}

feature/map/src/commonMain/kotlin/org/meshtastic/feature/map/BaseMapViewModel.kt

@@ -18,7 +18,6 @@ package org.meshtastic.feature.map
 
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
-import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.combine
@@ -26,6 +25,7 @@ import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.mapLatest
 import kotlinx.coroutines.launch
 import org.jetbrains.compose.resources.StringResource
+import org.meshtastic.core.common.util.ioDispatcher
 import org.meshtastic.core.common.util.nowSeconds
 import org.meshtastic.core.model.DataPacket
 import org.meshtastic.core.model.Node
@@ -139,7 +139,7 @@ open class BaseMapViewModel(
 
     fun getNodeOrFallback(nodeNum: Int): Node = nodeRepository.nodeDBbyNum.value[nodeNum] ?: Node(num = nodeNum)
 
-    fun deleteWaypoint(id: Int) = viewModelScope.launch(Dispatchers.IO) { packetRepository.deleteWaypoint(id) }
+    fun deleteWaypoint(id: Int) = viewModelScope.launch(ioDispatcher) { packetRepository.deleteWaypoint(id) }
 
     fun sendWaypoint(wpt: Waypoint, contactKey: String = "0${DataPacket.ID_BROADCAST}") {
         // contactKey: unique contact key filter (channel)+(nodeId)
@@ -151,7 +151,7 @@ open class BaseMapViewModel(
     }
 
     private fun sendDataPacket(p: DataPacket) {
-        viewModelScope.launch(Dispatchers.IO) { radioController.sendMessage(p) }
+        viewModelScope.launch(ioDispatcher) { radioController.sendMessage(p) }
     }
 
     fun generatePacketId(): Int = radioController.getPacketId()

feature/map/src/commonMain/kotlin/org/meshtastic/feature/map/navigation/MapNavigation.kt

@@ -16,23 +16,22 @@
  */
 package org.meshtastic.feature.map.navigation
 
+import androidx.compose.runtime.Composable
 import androidx.navigation3.runtime.EntryProviderScope
 import androidx.navigation3.runtime.NavBackStack
 import androidx.navigation3.runtime.NavKey
-import org.koin.compose.viewmodel.koinViewModel
 import org.meshtastic.core.navigation.MapRoutes
 import org.meshtastic.core.navigation.NodesRoutes
-import org.meshtastic.feature.map.MapScreen
-import org.meshtastic.feature.map.SharedMapViewModel
 
 fun EntryProviderScope<NavKey>.mapGraph(backStack: NavBackStack<NavKey>) {
     entry<MapRoutes.Map> { args ->
-        val viewModel = koinViewModel<SharedMapViewModel>()
-        MapScreen(
-            viewModel = viewModel,
+        MapMainScreen(
             onClickNodeChip = { backStack.add(NodesRoutes.NodeDetailGraph(it)) },
             navigateToNodeDetails = { backStack.add(NodesRoutes.NodeDetailGraph(it)) },
             waypointId = args.waypointId,
         )
     }
 }
+
+@Composable
+expect fun MapMainScreen(onClickNodeChip: (Int) -> Unit, navigateToNodeDetails: (Int) -> Unit, waypointId: Int?)

feature/map/src/iosMain/kotlin/org/meshtastic/feature/map/navigation/MapNavigation.kt

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2025-2026 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.map.navigation
+
+import androidx.compose.runtime.Composable
+
+@Composable
+actual fun MapMainScreen(onClickNodeChip: (Int) -> Unit, navigateToNodeDetails: (Int) -> Unit, waypointId: Int?) {
+    // TODO: Implement iOS map main screen
+}

feature/map/src/jvmMain/kotlin/org/meshtastic/feature/map/navigation/MapMainScreen.kt

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2025-2026 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.map.navigation
+
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.runtime.Composable
+
+@Composable
+actual fun MapMainScreen(onClickNodeChip: (Int) -> Unit, navigateToNodeDetails: (Int) -> Unit, waypointId: Int?) {
+    // Desktop placeholder for now
+    org.meshtastic.feature.map.navigation.PlaceholderScreen(name = "Map")
+}
+
+@Composable
+internal fun PlaceholderScreen(name: String) {
+    androidx.compose.foundation.layout.Box(
+        modifier = androidx.compose.ui.Modifier.fillMaxSize(),
+        contentAlignment = androidx.compose.ui.Alignment.Center,
+    ) {
+        androidx.compose.material3.Text(
+            text = name,
+            style = androidx.compose.material3.MaterialTheme.typography.headlineMedium,
+            color = androidx.compose.material3.MaterialTheme.colorScheme.onSurfaceVariant,
+        )
+    }
+}