Fix Codex transcript convergence

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

@@ -47,6 +47,50 @@ class TranscriptItemsTest {
         assertEquals(listOf("Still running its tests."), texts(items))
     }
 
+    @Test
+    fun completed_text_replaces_provisional_deltas_live() {
+        val items =
+            fold(
+                SessionEvent.AssistantText("I'll inspect the color-c concrete implementation"),
+                SessionEvent.AssistantTextFinal(
+                    "I’ll inspect the color-correction TODO and the relevant design."
+                ),
+            )
+        assertEquals(
+            listOf("I’ll inspect the color-correction TODO and the relevant design."),
+            texts(items),
+        )
+    }
+
+    @Test
+    fun completed_text_discards_provisional_deltas_across_a_page_boundary() {
+        val earlier = fold(SessionEvent.AssistantText("1. provisional section\n\n"))
+        val later =
+            fold(
+                SessionEvent.AssistantTextFinal("1. final first section\n\n2. final second section")
+            )
+
+        assertEquals(
+            listOf("1. final first section\n\n2. final second section"),
+            texts(joinPages(earlier, later)),
+        )
+    }
+
+    @Test
+    fun a_final_value_after_a_settled_reply_is_a_new_message_across_a_page_boundary() {
+        val earlier =
+            fold(
+                SessionEvent.AssistantText("Previous answer."),
+                SessionEvent.Status("idle"),
+            )
+        val later = fold(SessionEvent.AssistantTextFinal("Next answer."))
+
+        assertEquals(
+            listOf("Previous answer.", "Next answer."),
+            texts(joinPages(earlier, later)),
+        )
+    }
+
     /**
      * The rule that replaced the wall of reports. A turn that starts with nothing recorded in front
      * of it -- a subagent finishing, the CLI picking a conversation back up -- leaves two replies