Preserve device timestamp offsets across output reopen and counter wrap

tools/chatgui-android/app/src/test/java/com/utun/chat/data/CallOutputRecoveryTest.kt

@@ -22,8 +22,9 @@ class CallOutputRecoveryTest {
         p.reopen(accepted)
         assertEquals(accepted, p.played(0, accepted))
         assertEquals(accepted + 96, p.played(96, accepted + 672))
-        assertEquals(accepted + 48, p.timestamp(48))
-        assertEquals(-1L, p.timestamp(-1))
+        assertEquals(accepted + 48, p.timestamp(48, accepted + 672))
+        assertEquals(-1L, p.timestamp(-1, accepted + 672))
+        assertEquals(accepted + 0x100000030L, p.timestamp(48, accepted + 0x100000100L))
         assertNull(p.played(1000, accepted + 672))
         p.reopen(1920)
         assertEquals(1920L, p.played(0, 1920))