android: cover decimal channel IDs from SM in avatar regression tests

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

@@ -28,6 +28,19 @@ class AvatarProtocolTest {
             .forEach { assertFalse(it, AvatarProtocol.validFile(it)) }
         assertEquals(0L, AvatarProtocol.node("invalid"))
     }
+    @Test fun channelsUseDecimalIdsAndAvatarServersUseHex() {
+        // Реальные channel_id с SM: прежний hex-парсер превращал 19 цифр в 0.
+        listOf(7215665410053680736L, 7206723622466219923L, 1003157353743339669L, 123L).forEach { id ->
+            assertEquals(id, AvatarProtocol.groupId(id.toString()))
+            val event = group().also { ByteBuffer.wrap(it).order(ByteOrder.LITTLE_ENDIAN).putLong(8, id) }
+            assertEquals(AvatarProtocol.groupId(id.toString()), AvatarProtocol.group(event).group)
+        }
+        assertEquals(1751929779338959921L, AvatarProtocol.node("18501ada28ed5c31"))
+        assertEquals(-1L, AvatarProtocol.groupId("18446744073709551615"))
+        listOf("18446744073709551616", "-1", "18501ada28ed5c31", "invalid", "").forEach {
+            assertEquals(it, 0L, AvatarProtocol.groupId(it))
+        }
+    }
     @Test fun groupLimitAndSignedDeletion() {
         val record = AvatarProtocol.group(group(16384))
         assertEquals(71L, record.id); assertEquals(uid, record.group); assertEquals(123L, record.version)