Setup UX: allow Start w/ unsaved changes; hide delete for built-ins

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

@@ -319,6 +319,7 @@ fun App(vm: MainViewModel = viewModel(), billingManager: solutions.tretter.mindm
                                             modifier = Modifier.size(38.dp)
                                         )
                                     }
+                                    if (p.id in ui.deletableProgramIds) {
                                         Box(
                                             modifier = Modifier
                                                 .size(24.dp)
@@ -340,6 +341,7 @@ fun App(vm: MainViewModel = viewModel(), billingManager: solutions.tretter.mindm
                             }
                         }
                     }
+                }
 
                 AdBanner(
                     enabled = !ui.settings.noAds,
@@ -527,12 +529,14 @@ fun SetupScreen(
 
         Row(horizontalArrangement = Arrangement.spacedBy(8.dp), modifier = Modifier.fillMaxWidth()) {
             if (hasUnsavedChanges) {
-                OutlinedButton(onClick = { vm.saveCurrentProgram(programName) }, modifier = Modifier.weight(1f).height(52.dp)) {
+                OutlinedButton(
+                    onClick = { vm.saveCurrentProgram(programName) },
+                    modifier = Modifier.weight(1f).height(52.dp)
+                ) {
                     Text("Save")
                 }
-            } else {
-                Button(onClick = onStart, modifier = Modifier.weight(1f).height(52.dp)) { Text("Start") }
             }
+            Button(onClick = onStart, modifier = Modifier.weight(1f).height(52.dp)) { Text("Start") }
         }
         if (ui.error != null) Text(ui.error!!, color = if (ui.error!!.startsWith("Saved")) Color(0xFF72E39A) else MaterialTheme.colorScheme.error)
         Spacer(Modifier.height(8.dp))

app/src/main/java/com/mindmachine/mvp/session/MainViewModel.kt

@@ -34,6 +34,9 @@ data class UiState(
     val selectedPreset: SessionPreset = Presets.builtIn.first(),
     val config: SessionConfig = Presets.builtIn.first().toConfig(),
 
+    // Only user-saved programs (including customizations of built-ins) are deletable.
+    val deletableProgramIds: Set<String> = emptySet(),
+
     // Timeline program (curves) used for both editing + runtime modulation.
     val timeline: TimelineEditorState = TimelineProgramFactory.fromPreset(Presets.builtIn.first()),
     val savedProgramName: String = Presets.builtIn.first().name,
@@ -101,6 +104,7 @@ class MainViewModel(
             combine(settingsRepository.settings, userProgramRepository.userPrograms) { settings, userPrograms ->
                 settings to userPrograms
             }.collect { (settings, userPrograms) ->
+                val userProgramIds = userPrograms.map { it.id }.toSet()
                 val builtInPrograms = Presets.builtIn.map { preset ->
                     userPrograms.firstOrNull { it.id == preset.id } ?: UserProgramEntity(
                         id = preset.id,
@@ -121,7 +125,9 @@ class MainViewModel(
                         description = it.description,
                         timeline = it.timeline,
                         sortOrder = it.sortOrder,
-                        isUserProgram = true,
+                        // Deletable only when the user explicitly saved it (either custom program,
+                        // or a customized built-in stored in the user program store).
+                        isUserProgram = it.id in userProgramIds,
                     )
                 }
 
@@ -142,6 +148,7 @@ class MainViewModel(
                         savedProgramName = savedName,
                         savedTimelineSignature = savedSignature,
                         hasUnsavedChanges = isDirty(selectedPreset.name, nextTimeline, savedName, savedSignature),
+                        deletableProgramIds = userProgramIds,
                     )
                 }
             }