refactor(di): adopt @KoinApplication with startKoin<T>() compiler plugin API (#5152)

Signed-off-by: James Rich <2199651+jamesarich@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

app/src/main/kotlin/org/meshtastic/app/MeshUtilApplication.kt

@@ -37,9 +37,8 @@ import kotlinx.coroutines.withTimeout
 import org.koin.android.ext.android.get
 import org.koin.android.ext.koin.androidContext
 import org.koin.androidx.workmanager.koin.workManagerFactory
-import org.koin.core.context.startKoin
-import org.meshtastic.app.di.AppKoinModule
-import org.meshtastic.app.di.module
+import org.koin.plugin.module.dsl.startKoin
+import org.meshtastic.app.di.AndroidKoinApp
 import org.meshtastic.core.common.ContextServices
 import org.meshtastic.core.database.DatabaseManager
 import org.meshtastic.core.repository.MeshPrefs
@@ -64,10 +63,9 @@ open class MeshUtilApplication :
         super.onCreate()
         ContextServices.app = this
 
-        startKoin {
+        startKoin<AndroidKoinApp> {
             androidContext(this@MeshUtilApplication)
             workManagerFactory()
-            modules(AppKoinModule().module())
         }
 
         // Schedule periodic MeshLog cleanup

app/src/main/kotlin/org/meshtastic/app/di/AndroidKoinApp.kt

@@ -0,0 +1,26 @@
+/*
+ * 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.app.di
+
+import org.koin.core.annotation.KoinApplication
+
+/**
+ * Root Koin bootstrap for Android. The K2 compiler plugin uses this to discover the full module graph when
+ * [org.koin.plugin.module.dsl.startKoin] is called with this type parameter.
+ */
+@KoinApplication(modules = [AppKoinModule::class])
+object AndroidKoinApp

app/src/test/kotlin/org/meshtastic/app/di/KoinVerificationTest.kt

@@ -25,6 +25,7 @@ import androidx.work.WorkerParameters
 import io.ktor.client.HttpClient
 import io.ktor.client.engine.HttpClientEngine
 import kotlinx.coroutines.CoroutineDispatcher
+import org.koin.plugin.module.dsl.koinApplication
 import org.koin.test.verify.definition
 import org.koin.test.verify.injectedParameters
 import org.koin.test.verify.verify
@@ -60,4 +61,19 @@ class KoinVerificationTest {
                 ),
             )
     }
+
+    @Test
+    fun verifyTypedBootstrapLoadsModuleGraph() {
+        // koinApplication<T>() is a K2 compiler plugin stub. If the plugin fails to
+        // transform it, the stub throws NotImplementedError at runtime. This test
+        // validates that the production bootstrap path is correctly transformed by
+        // successfully creating and closing the generated Koin application.
+        val app = koinApplication<AndroidKoinApp>()
+        try {
+            // No-op: reaching this point proves the typed bootstrap path did not
+            // throw and the generated application could be created.
+        } finally {
+            app.close()
+        }
+    }
 }