UX: remove welcome screen (start at safety), bump version

app/build.gradle.kts

@@ -11,7 +11,7 @@ android {
         applicationId = "com.mindmachine.mvp"
         minSdk = 26
         targetSdk = 35
-        versionCode = 3
+        versionCode = 4
         versionName = "1.0"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"

app/src/main/java/com/mindmachine/mvp/MainActivity.kt

@@ -186,13 +186,8 @@ fun App(vm: MainViewModel = viewModel()) {
         return
     }
 
-    val startRoute = if (ui.settings.safetyAcknowledged) "home" else "welcome"
+    val startRoute = if (ui.settings.safetyAcknowledged) "home" else "safety"
     NavHost(navController = nav, startDestination = startRoute, modifier = Modifier.background(MaterialTheme.colorScheme.background)) {
-        composable("welcome") {
-            SimpleScreen("MindMachine", "Blinking light + binaural audio. Stereo headphones required for binaural mode. Not a medical device.") {
-                Button(onClick = { nav.navigate("safety") }) { Text("Continue") }
-            }
-        }
         composable("safety") {
             SafetyScreen(
                 onAck = {