updates: hide the channel picker until a pre-release ships

gearslip/src/main/java/app/seb3thehacker/gearslip/ui/UpdateViews.kt

@@ -116,11 +116,14 @@ private fun statusLine(state: State): String = when (state) {
     is State.Failed -> state.message
 }
 
-private val CHANNELS = listOf(
-    Triple(UpdateChecker.Channel.STABLE, "Stable", "Finished releases only"),
-    Triple(UpdateChecker.Channel.BETA, "Beta", "Test versions that are nearly done"),
-    Triple(UpdateChecker.Channel.ALPHA, "Alpha", "Every test version, first. Expect bugs"),
-)
+/**
+ * The channels the dialog offers. Empty for now: every release so far goes out as GitHub's latest,
+ * so Beta and Alpha would offer the same as Stable. Add them back once a pre-release ships:
+ *   Triple(UpdateChecker.Channel.STABLE, "Stable", "Finished releases only"),
+ *   Triple(UpdateChecker.Channel.BETA, "Beta", "Test versions that are nearly done"),
+ *   Triple(UpdateChecker.Channel.ALPHA, "Alpha", "Every test version, first. Expect bugs"),
+ */
+private val CHANNELS = emptyList<Triple<UpdateChecker.Channel, String, String>>()
 
 /** The one Settings row for updates. Checking, the channel and automatic checks all sit behind it. */
 @Composable
@@ -130,11 +133,11 @@ internal fun UpdateRow() {
     SessionStatus.state.collectAsStateWithLifecycle().value
     var channel by remember { mutableStateOf(UpdateChecker.channel(context)) }
     var open by remember { mutableStateOf(false) }
-    val channelName = CHANNELS.first { it.first == channel }.second
+    val channelName = CHANNELS.firstOrNull { it.first == channel }?.second
     SettingsRow(
         "Updates",
         Modifier.clickable { open = true },
-        subtitle = "$channelName · ${statusLine(state)}",
+        subtitle = listOfNotNull(channelName, statusLine(state)).joinToString(" · "),
         icon = Icons.Filled.CheckCircle,
         trailing = {
             Icon(