Load extensions off the main thread (#3788)

Assisted-by: Claude:claude-opus-5

app/src/main/java/eu/kanade/tachiyomi/extension/ExtensionManager.kt

@@ -14,6 +14,7 @@ import eu.kanade.tachiyomi.extension.util.ExtensionInstaller
 import eu.kanade.tachiyomi.extension.util.ExtensionLoader
 import eu.kanade.tachiyomi.util.system.toast
 import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.SupervisorJob
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -23,6 +24,7 @@ import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.emptyFlow
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.stateIn
+import kotlinx.coroutines.launch
 import logcat.LogPriority
 import tachiyomi.core.common.util.lang.withUIContext
 import tachiyomi.core.common.util.system.logcat
@@ -72,8 +74,10 @@ class ExtensionManager(
     val untrustedExtensionsFlow = untrustedExtensionMapFlow.mapExtensions(scope)
 
     init {
-        initExtensions()
-        ExtensionInstallReceiver(InstallationListener()).register(context)
+        scope.launch(Dispatchers.IO) {
+            initExtensions()
+            ExtensionInstallReceiver(InstallationListener()).register(context)
+        }
     }
 
     private var subLanguagesEnabledOnFirstRun = preferences.enabledLanguages.isSet()