Let failed messages be discarded

app/androidApp/src/test/kotlin/com/example/aiapp/PendingMessagesTest.kt

@@ -48,6 +48,16 @@ class PendingMessagesTest {
         assertTrue(queued.single().serverAccepted)
     }
 
+    @Test
+    fun discarding_a_failed_send_removes_only_that_local_copy() {
+        val server = QueuedMessage("server-1", "already accepted", emptyList())
+        val queued = listOf(local(), local("keep this one").copy(id = "local-2"), server)
+
+        val discarded = discardPendingMessage(queued, "local-1")
+
+        assertEquals(listOf("local-2", "server-1"), discarded.map { it.id })
+    }
+
     @Test
     fun identical_messages_are_reconciled_one_at_a_time() {
         val queued = listOf(local(), local().copy(id = "local-2"))