refactor: coroutine dispatchers and modernize testing infrastructure (#4901)

Signed-off-by: James Rich <2199651+jamesarich@users.noreply.github.com>

desktop/src/main/kotlin/org/meshtastic/desktop/di/DesktopKoinModule.kt

@@ -66,6 +66,9 @@ import org.meshtastic.core.service.di.module as coreServiceModule
 import org.meshtastic.core.ui.di.module as coreUiModule
 import org.meshtastic.desktop.di.module as desktopDiModule
 import org.meshtastic.feature.connections.di.module as featureConnectionsModule
+import org.meshtastic.feature.firmware.di.module as featureFirmwareModule
+import org.meshtastic.feature.intro.di.module as featureIntroModule
+import org.meshtastic.feature.map.di.module as featureMapModule
 import org.meshtastic.feature.messaging.di.module as featureMessagingModule
 import org.meshtastic.feature.node.di.module as featureNodeModule
 import org.meshtastic.feature.settings.di.module as featureSettingsModule
@@ -100,6 +103,9 @@ fun desktopModule() = module {
         org.meshtastic.feature.node.di.FeatureNodeModule().featureNodeModule(),
         org.meshtastic.feature.messaging.di.FeatureMessagingModule().featureMessagingModule(),
         org.meshtastic.feature.connections.di.FeatureConnectionsModule().featureConnectionsModule(),
+        org.meshtastic.feature.map.di.FeatureMapModule().featureMapModule(),
+        org.meshtastic.feature.firmware.di.FeatureFirmwareModule().featureFirmwareModule(),
+        org.meshtastic.feature.intro.di.FeatureIntroModule().featureIntroModule(),
         org.meshtastic.desktop.di.DesktopDiModule().desktopDiModule(),
         desktopPlatformStubsModule(),
     )
@@ -168,4 +174,13 @@ private fun desktopPlatformStubsModule() = module {
             override fun loadBootloaderOtaQuirksFromJsonAsset(): List<BootloaderOtaQuirk> = emptyList()
         }
     }
+
+    // Firmware update stubs
+    single<org.meshtastic.feature.firmware.FirmwareUpdateManager> {
+        org.meshtastic.desktop.stub.NoopFirmwareUpdateManager()
+    }
+    single<org.meshtastic.feature.firmware.FirmwareUsbManager> { org.meshtastic.desktop.stub.NoopFirmwareUsbManager() }
+    single<org.meshtastic.feature.firmware.FirmwareFileHandler> {
+        org.meshtastic.desktop.stub.NoopFirmwareFileHandler()
+    }
 }

desktop/src/main/kotlin/org/meshtastic/desktop/notification/DesktopMeshServiceNotifications.kt

@@ -40,7 +40,10 @@ class DesktopMeshServiceNotifications(private val notificationManager: Notificat
         // no-op for desktop
     }
 
-    override fun updateServiceStateNotification(summaryString: String?, telemetry: Telemetry?): Any {
+    override fun updateServiceStateNotification(
+        state: org.meshtastic.core.model.ConnectionState,
+        telemetry: Telemetry?,
+    ): Any {
         // We don't have a foreground service on desktop
         return Unit
     }

desktop/src/main/kotlin/org/meshtastic/desktop/stub/FirmwareStubs.kt

@@ -0,0 +1,75 @@
+/*
+ * 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.desktop.stub
+
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.emptyFlow
+import org.meshtastic.core.common.util.CommonUri
+import org.meshtastic.core.database.entity.FirmwareRelease
+import org.meshtastic.core.model.DeviceHardware
+import org.meshtastic.feature.firmware.DfuInternalState
+import org.meshtastic.feature.firmware.FirmwareFileHandler
+import org.meshtastic.feature.firmware.FirmwareUpdateManager
+import org.meshtastic.feature.firmware.FirmwareUpdateState
+import org.meshtastic.feature.firmware.FirmwareUsbManager
+
+class NoopFirmwareUpdateManager : FirmwareUpdateManager {
+    override suspend fun startUpdate(
+        release: FirmwareRelease,
+        hardware: DeviceHardware,
+        address: String,
+        updateState: (FirmwareUpdateState) -> Unit,
+        firmwareUri: CommonUri?,
+    ): String? = null
+
+    override fun dfuProgressFlow(): Flow<DfuInternalState> = emptyFlow()
+}
+
+class NoopFirmwareUsbManager : FirmwareUsbManager {
+    override fun deviceDetachFlow(): Flow<Unit> = emptyFlow()
+}
+
+@Suppress("EmptyFunctionBlock")
+class NoopFirmwareFileHandler : FirmwareFileHandler {
+    override fun cleanupAllTemporaryFiles() {}
+
+    override suspend fun checkUrlExists(url: String): Boolean = false
+
+    override suspend fun downloadFile(url: String, fileName: String, onProgress: (Float) -> Unit): String? = null
+
+    override suspend fun extractFirmware(
+        uri: CommonUri,
+        hardware: DeviceHardware,
+        fileExtension: String,
+        preferredFilename: String?,
+    ): String? = null
+
+    override suspend fun extractFirmwareFromZip(
+        zipFilePath: String,
+        hardware: DeviceHardware,
+        fileExtension: String,
+        preferredFilename: String?,
+    ): String? = null
+
+    override suspend fun getFileSize(path: String): Long = 0L
+
+    override suspend fun deleteFile(path: String) {}
+
+    override suspend fun copyFileToUri(sourcePath: String, destinationUri: CommonUri): Long = 0L
+
+    override suspend fun copyUriToUri(sourceUri: CommonUri, destinationUri: CommonUri): Long = 0L
+}

desktop/src/main/kotlin/org/meshtastic/desktop/stub/NoopStubs.kt

@@ -111,7 +111,10 @@ class NoopMeshServiceNotifications : MeshServiceNotifications {
 
     override fun initChannels() {}
 
-    override fun updateServiceStateNotification(summaryString: String?, telemetry: Telemetry?): Any = Unit
+    override fun updateServiceStateNotification(
+        state: org.meshtastic.core.model.ConnectionState,
+        telemetry: Telemetry?,
+    ): Any = Unit
 
     override suspend fun updateMessageNotification(
         contactKey: String,