Fix flickering status card on app startup

app/src/main/java/sh/sar/isodroid/ui/components/StatusCard.kt

@@ -33,16 +33,25 @@ import sh.sar.isodroid.ui.theme.UnmountedGray
 @Composable
 fun StatusCard(
     mountStatus: MountStatus,
-    rootAvailable: Boolean,
-    deviceSupported: Boolean,
+    rootAvailable: Boolean?,
+    deviceSupported: Boolean?,
     modifier: Modifier = Modifier
 ) {
+    // Only show errors when explicitly false (not null = checking)
+    val showRootError = rootAvailable == false
+    val showSupportError = deviceSupported == false
+    val hasError = showRootError || showSupportError
+
+    // Hide card completely until checks are done
+    if (rootAvailable == null || (rootAvailable == true && deviceSupported == null)) {
+        return
+    }
+
     Card(
         modifier = modifier.fillMaxWidth(),
         colors = CardDefaults.cardColors(
             containerColor = when {
-                !rootAvailable -> MaterialTheme.colorScheme.errorContainer
-                !deviceSupported -> MaterialTheme.colorScheme.errorContainer
+                hasError -> MaterialTheme.colorScheme.errorContainer
                 mountStatus.mounted -> MaterialTheme.colorScheme.primaryContainer
                 else -> MaterialTheme.colorScheme.surfaceVariant
             }
@@ -61,13 +70,13 @@ fun StatusCard(
                 Row(verticalAlignment = Alignment.CenterVertically) {
                     Icon(
                         imageVector = when {
-                            !rootAvailable || !deviceSupported -> Icons.Default.Error
+                            hasError -> Icons.Default.Error
                             mountStatus.mounted -> Icons.Default.CheckCircle
                             else -> Icons.Default.Usb
                         },
                         contentDescription = null,
                         tint = when {
-                            !rootAvailable || !deviceSupported -> ErrorRed
+                            hasError -> ErrorRed
                             mountStatus.mounted -> MountedGreen
                             else -> UnmountedGray
                         },
@@ -77,21 +86,21 @@ fun StatusCard(
                     Column {
                         Text(
                             text = when {
-                                !rootAvailable -> "Root Access Required"
-                                !deviceSupported -> "Device Not Supported"
+                                showRootError -> "Root Access Required"
+                                showSupportError -> "Device Not Supported"
                                 mountStatus.mounted -> "Mounted"
                                 else -> "Not Mounted"
                             },
                             style = MaterialTheme.typography.titleMedium,
                             fontWeight = FontWeight.SemiBold
                         )
-                        if (!rootAvailable) {
+                        if (showRootError) {
                             Text(
                                 text = "Grant root access to use ISODroid",
                                 style = MaterialTheme.typography.bodySmall,
                                 color = MaterialTheme.colorScheme.onSurfaceVariant
                             )
-                        } else if (!deviceSupported) {
+                        } else if (showSupportError) {
                             Text(
                                 text = "USB gadget not supported on this device",
                                 style = MaterialTheme.typography.bodySmall,

app/src/main/java/sh/sar/isodroid/ui/screens/MainScreen.kt

@@ -92,7 +92,7 @@ fun MainScreen(
                 actions = {
                     IconButton(
                         onClick = { showCreateImgDialog = true },
-                        enabled = uiState.hasRoot && uiState.isSupported
+                        enabled = uiState.hasRoot == true && uiState.isSupported == true
                     ) {
                         Icon(
                             imageVector = Icons.Default.Add,
@@ -163,7 +163,7 @@ fun MainScreen(
                 ) {
                     CircularProgressIndicator()
                 }
-            } else if (uiState.hasRoot && uiState.isSupported) {
+            } else if (uiState.hasRoot == true && uiState.isSupported == true) {
                 FileBrowser(
                     files = uiState.isoFiles,
                     currentPath = uiState.currentPath,

app/src/main/java/sh/sar/isodroid/ui/screens/SettingsScreen.kt

@@ -163,7 +163,7 @@ fun SettingsScreen(
                     modifier = Modifier.padding(16.dp)
                 ) {
                     // Root Access status
-                    val hasRoot = uiState.hasRoot
+                    val hasRoot = uiState.hasRoot ?: false
                     val rootDenied = uiState.rootDenied
                     PermissionStatusItem(
                         icon = Icons.Default.Security,

app/src/main/java/sh/sar/isodroid/viewmodel/MainViewModel.kt

@@ -178,6 +178,8 @@ class MainViewModel(application: Application) : AndroidViewModel(application) {
                 loadFiles()
                 checkMountStatus()
             }
+        } else {
+            _uiState.update { it.copy(isSupported = false) }
         }
 
         _uiState.update { it.copy(isLoading = false) }
@@ -380,7 +382,7 @@ class MainViewModel(application: Application) : AndroidViewModel(application) {
         viewModelScope.launch {
             // Check cached status (no popup)
             val cachedStatus = RootManager.isRootGrantedCached()
-            if (cachedStatus == true && !_uiState.value.hasRoot) {
+            if (cachedStatus == true && _uiState.value.hasRoot != true) {
                 // Root was granted externally (e.g., in Magisk settings)
                 _uiState.update { it.copy(hasRoot = true, rootDenied = false) }
 
@@ -546,9 +548,9 @@ class MainViewModel(application: Application) : AndroidViewModel(application) {
 
 data class MainUiState(
     val isLoading: Boolean = true,
-    val hasRoot: Boolean = false,
+    val hasRoot: Boolean? = null, // null = checking, true = granted, false = denied
     val rootDenied: Boolean = false, // True if user denied root in Magisk
-    val isSupported: Boolean = false,
+    val isSupported: Boolean? = null, // null = checking, true = supported, false = not supported
     val mountStatus: MountStatus = MountStatus.UNMOUNTED,
     val isoFiles: List<IsoFile> = emptyList(),
     val currentPath: String = "",