Isolate complete short-write frames from playback already in flight

tools/chatgui-android/router-tests/src/test/kotlin/com/utun/chat/data/RadioWorkerLifecycleTest.kt

@@ -136,10 +136,10 @@ class RadioWorkerLifecycleTest {
         track.maxWriteSamples = 128
         await("short writes") { track.writes.size >= 30 }
         val writes = track.writes.toList()
-        val first = writes.indexOfFirst { it.offset == 0 }
+        val first = writes.indexOfFirst { it.offset == 0 && it.result == 128 }
         assertTrue(first >= 0)
         assertEquals((0 until 1920 step 128).toList(), writes.drop(first).take(15).map { it.offset })
-        assertTrue(writes.all { it.result == 128 })
+        assertTrue(writes.drop(first).take(15).all { it.result == 128 })
         track.maxWriteSamples = Int.MAX_VALUE; track.writes.clear()
         NativeLib.radioPullResults.addAll(listOf(1920, 1000, 0))
         await("full and partial pull") { track.writes.toList().count { it.pcm.firstOrNull() == 7.toShort() } >= 2 }