fix(android): parse optional userNotification fields for dual/user schedule

parseUserNotificationConfig used getBoolean/getString for title, body, sound,
vibration, and priority; missing keys threw JSONException though TS marks them
optional. Add optBooleanOrNull/optStringOrNull (same pattern as optIntOrNull) and
defer to existing NotifyReceiver/DualScheduleHelper defaults.

Document in README; extend CHANGELOG [2.1.3].

CHANGELOG.md

@@ -10,10 +10,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 
 - **Android**: `scheduleDualNotification` / `parseContentFetchConfig` no longer requires `timeout`, `retryAttempts`, and `retryDelay` in `contentFetch` (optional fields per TypeScript). Omitted values defer to `FetchWorker` defaults.
+- **Android**: `parseUserNotificationConfig` no longer uses strict `getBoolean` / `getString` for optional `userNotification` fields (`title`, `body`, `sound`, `vibration`, `priority`). Omitted keys no longer throw `JSONException`; native scheduling applies existing defaults (`NotifyReceiver` / `DualScheduleHelper`).
 
 ### Documentation
 
-- **README**: Note default behavior when those `contentFetch` fields are omitted.
+- **README**: Notes for omitted `contentFetch` and optional `userNotification` fields on Android.
 
 ## [1.1.6] - 2026-02-16
 

README.md

@@ -322,6 +322,8 @@ await DailyNotification.scheduleDualNotification({
 
 If `contentFetch` omits `timeout`, `retryAttempts`, or `retryDelay`, Android applies defaults when scheduling fetch work (currently 30000 ms, 3 attempts, 1000 ms between attempts; see `FetchWorker`).
 
+If `userNotification` omits optional fields (`title`, `body`, `sound`, `vibration`, `priority`), Android parses them as omitted; scheduling uses the same defaults as `NotifyReceiver` / `DualScheduleHelper` (e.g. sound and vibration default to on, priority to `normal` where applicable).
+
 ### Callback Methods
 
 #### `registerCallback(name, config)`

android/src/main/java/org/timesafari/dailynotification/DailyNotificationPlugin.kt

@@ -2401,6 +2401,14 @@ open class DailyNotificationPlugin : Plugin() {
     private fun JSObject.optIntOrNull(key: String): Int? =
         if (has(key) && !isNull(key)) optInt(key) else null
 
+    /** Optional boolean: absent or JSON-null → null (aligns with TS optional fields). */
+    private fun JSObject.optBooleanOrNull(key: String): Boolean? =
+        if (has(key) && !isNull(key)) optBoolean(key) else null
+
+    /** Optional string: absent or JSON-null → null. Present empty string is preserved. */
+    private fun JSObject.optStringOrNull(key: String): String? =
+        if (has(key) && !isNull(key)) optString(key) else null
+
     private fun parseContentFetchConfig(configJson: JSObject): ContentFetchConfig {
         val callbacksObj = configJson.getJSObject("callbacks")
         return ContentFetchConfig(
@@ -2422,11 +2430,11 @@ open class DailyNotificationPlugin : Plugin() {
         return UserNotificationConfig(
             enabled = configJson.getBoolean("enabled") ?: true,
             schedule = configJson.getString("schedule") ?: "0 9 * * *",
-            title = configJson.getString("title"),
-            body = configJson.getString("body"),
-            sound = configJson.getBoolean("sound"),
-            vibration = configJson.getBoolean("vibration"),
-            priority = configJson.getString("priority")
+            title = configJson.optStringOrNull("title"),
+            body = configJson.optStringOrNull("body"),
+            sound = configJson.optBooleanOrNull("sound"),
+            vibration = configJson.optBooleanOrNull("vibration"),
+            priority = configJson.optStringOrNull("priority")
         )
     }