Fix StackOverflowError in SyncWorker chunked() extension

The custom chunked() extension function recursively called itself instead of
using Kotlin's standard library chunked() method, causing StackOverflowError.

Removed the buggy custom extension - Kotlin's List<T>.chunked() is already
available in the standard library.

native-route/android/app/src/main/java/com/rssuper/SyncWorker.kt

@@ -91,7 +91,10 @@ class SyncWorker(
             }
             
             // Update last sync date
-            syncScheduler.pref s.edit()
+            applicationContext.getSharedPreferences(
+                SyncConfiguration.PREFS_NAME,
+                Context.MODE_PRIVATE
+            ).edit()
                 .putLong(SyncConfiguration.PREF_LAST_SYNC_DATE, System.currentTimeMillis())
                 .apply()
             
@@ -262,10 +265,4 @@ data class Article(
     val content: String?
 )
 
-/**
- * Extension function to chunk a list into batches
- */
-fun <T> List<T>.chunked(size: Int): List<List<T>> {
-    require(size > 0) { "Chunk size must be positive, was: $size"}
-    return this.chunked(size)
-}
+