fix(fdroid): Firebase-free stubs for expo-notifications

fdroid/expo-notifications-patches/tokens/PushTokenModule.kt

@@ -0,0 +1,42 @@
+package expo.modules.notifications.tokens
+
+import expo.modules.kotlin.Promise
+import expo.modules.kotlin.modules.Module
+import expo.modules.kotlin.modules.ModuleDefinition
+import expo.modules.notifications.service.delegates.FirebaseMessagingDelegate.Companion.addTokenListener
+import expo.modules.notifications.tokens.interfaces.FirebaseTokenListener
+
+private const val NEW_TOKEN_EVENT_NAME = "onDevicePushToken"
+private const val NEW_TOKEN_EVENT_TOKEN_KEY = "devicePushToken"
+private const val REGISTRATION_FAIL_CODE = "E_REGISTRATION_FAILED"
+private const val UNREGISTER_FOR_NOTIFICATIONS_FAIL_CODE = "E_UNREGISTER_FOR_NOTIFICATIONS_FAILED"
+
+/**
+ * Stub PushTokenModule (Firebase-free) for F-Droid builds.
+ * Push tokens are unavailable without Firebase — getDevicePushTokenAsync rejects with an error.
+ */
+class PushTokenModule : Module(), FirebaseTokenListener {
+  override fun onNewToken(token: String) {
+    runCatching {
+      sendEvent(NEW_TOKEN_EVENT_NAME, mapOf(NEW_TOKEN_EVENT_TOKEN_KEY to token))
+    }
+  }
+
+  override fun definition() = ModuleDefinition {
+    Name("ExpoPushTokenManager")
+
+    Events("onDevicePushToken")
+
+    OnCreate {
+      addTokenListener(this@PushTokenModule)
+    }
+
+    AsyncFunction("getDevicePushTokenAsync") { promise: Promise ->
+      promise.reject(REGISTRATION_FAIL_CODE, "Push notifications via FCM are not available in this build (F-Droid). Use local notifications only.", null)
+    }
+
+    AsyncFunction("unregisterForNotificationsAsync") { promise: Promise ->
+      promise.resolve(null)
+    }
+  }
+}