Improve toast and fix secure clipboard

diff --git a/android/app/src/main/kotlin/com/example/monero_light_wallet/MainActivity.kt b/android/app/src/main/kotlin/com/example/monero_light_wallet/MainActivity.kt
index d17cb4f..1646df8 100644
--- a/android/app/src/main/kotlin/com/example/monero_light_wallet/MainActivity.kt
+++ b/android/app/src/main/kotlin/com/example/monero_light_wallet/MainActivity.kt
@@ -3,6 +3,7 @@ package org.magicgrants.skylight
 import android.content.ClipData
 import android.content.ClipboardManager
 import android.content.Context
+import android.os.Build
 import android.os.PersistableBundle
 import io.flutter.embedding.android.FlutterFragmentActivity
 import io.flutter.embedding.engine.FlutterEngine
@@ -21,6 +22,12 @@ class MainActivity : FlutterFragmentActivity() {
                         copySensitive(call.argument<String>("text") ?: "")
                         result.success(null)
                     }
+                    // Android 13 shows its own clipboard confirmation, so the
+                    // app must not add a second one. Older releases show
+                    // nothing and still need the in-app toast.
+                    "systemConfirmsCopy" -> {
+                        result.success(Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU)
+                    }
                     else -> result.notImplemented()
                 }
             }
diff --git a/lib/screens/address_book.dart b/lib/screens/address_book.dart
index 3a8cf84..97a9bc1 100644
--- a/lib/screens/address_book.dart
+++ b/lib/screens/address_book.dart
@@ -419,7 +419,7 @@ class _AddressRow extends StatelessWidget {
     final i18n = AppLocalizations.of(context)!;
     // Treat as sensitive (auto-cleared) like other address/key copies.
     SecureClipboard.copy(contact.address);
-    ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(i18n.addressCopied)));
+    showCopyToast(context, i18n.addressCopied);
   }
 
   @override
@@ -578,7 +578,7 @@ class _ContactSheetState extends State<_ContactSheet> {
       if (mounted) Navigator.pop(context);
     } catch (_) {
       if (mounted) {
-        ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(i18n.unknownError)));
+        showBrandToast(context, i18n.unknownError);
         setState(() => _saving = false);
       }
     }
diff --git a/lib/screens/create_wallet.dart b/lib/screens/create_wallet.dart
index c73e9fb..78d13b5 100644
--- a/lib/screens/create_wallet.dart
+++ b/lib/screens/create_wallet.dart
@@ -28,7 +28,7 @@ class _CreateWalletScreenState extends State<CreateWalletScreen> {
       final args = ModalRoute.of(context)?.settings.arguments as CreateWalletScreenArgs?;
 
       if (args != null && args.toastMessage != '') {
-        ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(args.toastMessage)));
+        showBrandToast(context, args.toastMessage);
       }
     });
   }
diff --git a/lib/screens/create_wallet_password.dart b/lib/screens/create_wallet_password.dart
index ca237c1..e8626ac 100644
--- a/lib/screens/create_wallet_password.dart
+++ b/lib/screens/create_wallet_password.dart
@@ -23,9 +23,7 @@ class _CreateWalletPasswordScreenState extends State<CreateWalletPasswordScreen>
       }
     } catch (e) {
       if (mounted) {
-        ScaffoldMessenger.of(
-          context,
-        ).showSnackBar(SnackBar(content: Text('Failed to save password: $e')));
+        showBrandToast(context, 'Failed to save password: $e');
       }
     } finally {
       if (mounted) {
diff --git a/lib/screens/generate_seed.dart b/lib/screens/generate_seed.dart
index 59ae757..485fb92 100644
--- a/lib/screens/generate_seed.dart
+++ b/lib/screens/generate_seed.dart
@@ -64,7 +64,7 @@ class _GenerateSeedScreenState extends State<GenerateSeedScreen> with SecureScre
       } else {
         log(LogLevel.error, error.toString());
       }
-      ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(errorMsg)));
+      showBrandToast(context, errorMsg);
     }
   }
 
diff --git a/lib/screens/lws_details.dart b/lib/screens/lws_details.dart
index ceb907f..5661a4c 100644
--- a/lib/screens/lws_details.dart
+++ b/lib/screens/lws_details.dart
@@ -1,7 +1,7 @@
 import 'package:flutter/material.dart';
-import 'package:flutter/services.dart';
 
 import 'package:skylight_wallet/l10n/app_localizations.dart';
+import 'package:skylight_wallet/util/secure_clipboard.dart';
 import 'package:skylight_wallet/wallet_core_glue.dart';
 import 'package:skylight_wallet/widgets/ui/ui.dart';
 
@@ -27,11 +27,11 @@ class _LwsDetailsScreenState extends State<LwsDetailsScreen> {
     setState(() => _secretViewKey = key);
   }
 
-  void _copy(String value, {required bool sensitive}) {
+  void _copy(String value) {
     if (value.isEmpty) return;
-    Clipboard.setData(ClipboardData(text: value));
+    SecureClipboard.copy(value);
     final i18n = AppLocalizations.of(context)!;
-    ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(i18n.copiedToClipboard)));
+    showCopyToast(context, i18n.copiedToClipboard);
   }
 
   @override
diff --git a/lib/screens/lws_keys.dart b/lib/screens/lws_keys.dart
index eaeea75..c219be3 100644
--- a/lib/screens/lws_keys.dart
+++ b/lib/screens/lws_keys.dart
@@ -36,11 +36,11 @@ class _LwsKeysScreenState extends State<LwsKeysScreen> with SecureScreenMixin {
     });
   }
 
-  void _copy(String value, {required bool sensitive}) {
+  void _copy(String value) {
     if (value.isEmpty) return;
     SecureClipboard.copy(value);
     final i18n = AppLocalizations.of(context)!;
-    ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(i18n.copiedToClipboard)));
+    showCopyToast(context, i18n.copiedToClipboard);
   }
 
   @override
diff --git a/lib/screens/receive.dart b/lib/screens/receive.dart
index c1a01e8..c2a30b5 100644
--- a/lib/screens/receive.dart
+++ b/lib/screens/receive.dart
@@ -1,12 +1,12 @@
 import 'dart:io';
 
 import 'package:flutter/material.dart';
-import 'package:flutter/services.dart';
 import 'package:share_plus/share_plus.dart';
 import 'package:screen_brightness/screen_brightness.dart';
 
 import 'package:skylight_wallet/l10n/app_localizations.dart';
 import 'package:skylight_wallet/models/app_wallet.dart';
+import 'package:skylight_wallet/util/secure_clipboard.dart';
 import 'package:skylight_wallet/wallet_core_glue.dart';
 import 'package:skylight_wallet/widgets/ui/ui.dart';
 
@@ -46,8 +46,8 @@ class _ReceiveScreenState extends State<ReceiveScreen> {
 
   void _copyAddressToClipboard(String address) {
     final i18n = AppLocalizations.of(context)!;
-    Clipboard.setData(ClipboardData(text: address));
-    ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(i18n.addressCopied)));
+    SecureClipboard.copy(address);
+    showCopyToast(context, i18n.addressCopied);
   }
 
   @override
diff --git a/lib/screens/restore_wallet.dart b/lib/screens/restore_wallet.dart
index edb1f17..5989ec9 100644
--- a/lib/screens/restore_wallet.dart
+++ b/lib/screens/restore_wallet.dart
@@ -128,14 +128,14 @@ class _RestoreWalletScreenState extends State<RestoreWalletScreen> with SecureSc
         final message = errorMsg == 'Invalid mnemonic.'
             ? i18n.restoreWalletInvalidMnemonic
             : i18n.unknownError;
-        ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(message)));
+        showBrandToast(context, message);
       }
       return;
     } catch (error) {
       log(LogLevel.error, error.toString());
       setState(() => _isLoading = false);
       if (mounted) {
-        ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(i18n.unknownError)));
+        showBrandToast(context, i18n.unknownError);
       }
       return;
     }
diff --git a/lib/screens/secret_keys.dart b/lib/screens/secret_keys.dart
index 60219b7..6fba6ca 100644
--- a/lib/screens/secret_keys.dart
+++ b/lib/screens/secret_keys.dart
@@ -54,11 +54,11 @@ class _SecretKeysScreenState extends State<SecretKeysScreen> with SecureScreenMi
     });
   }
 
-  void _copy(String value, {required bool sensitive}) {
+  void _copy(String value) {
     if (value.isEmpty) return;
     SecureClipboard.copy(value);
     final i18n = AppLocalizations.of(context)!;
-    ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(i18n.copiedToClipboard)));
+    showCopyToast(context, i18n.copiedToClipboard);
   }
 
   @override
@@ -73,8 +73,8 @@ class _SecretKeysScreenState extends State<SecretKeysScreen> with SecureScreenMi
       );
     }
 
-    // Seeds and the secret spend key are blurred until revealed; the public keys
-    // aren't sensitive.
+    // Seeds and the secret spend key are blurred until revealed; the public
+    // keys are shown outright.
     return KeyRevealView(
       title: i18n.secretKeysTitle,
       description: i18n.secretKeysDescription,
@@ -105,16 +105,8 @@ class _SecretKeysScreenState extends State<SecretKeysScreen> with SecureScreenMi
           value: data.secretSpendKey,
           revealable: true,
         ),
-        KeyRevealField(
-          label: i18n.secretKeysPublicSpendKey,
-          value: data.publicSpendKey,
-          sensitive: false,
-        ),
-        KeyRevealField(
-          label: i18n.secretKeysPublicViewKey,
-          value: data.publicViewKey,
-          sensitive: false,
-        ),
+        KeyRevealField(label: i18n.secretKeysPublicSpendKey, value: data.publicSpendKey),
+        KeyRevealField(label: i18n.secretKeysPublicViewKey, value: data.publicViewKey),
       ],
     );
   }
diff --git a/lib/screens/send.dart b/lib/screens/send.dart
index 738166c..0d667cc 100644
--- a/lib/screens/send.dart
+++ b/lib/screens/send.dart
@@ -138,9 +138,7 @@ class _SendScreenState extends State<SendScreen> {
     if (uri != null && uri.scheme == 'monero') {
       if (!wallet.isAddressValid(uri.path)) {
         if (mounted) {
-          ScaffoldMessenger.of(
-            context,
-          ).showSnackBar(SnackBar(content: Text(i18n.sendInvalidAddressError)));
+          showBrandToast(context, i18n.sendInvalidAddressError);
         }
         return;
       }
@@ -154,9 +152,7 @@ class _SendScreenState extends State<SendScreen> {
       address = result;
     } else {
       if (mounted) {
-        ScaffoldMessenger.of(
-          context,
-        ).showSnackBar(SnackBar(content: Text(i18n.sendInvalidAddressError)));
+        showBrandToast(context, i18n.sendInvalidAddressError);
       }
       return;
     }
@@ -371,9 +367,7 @@ class _SendScreenState extends State<SendScreen> {
           _isLoadingFees = false;
         });
 
-        ScaffoldMessenger.of(
-          context,
-        ).showSnackBar(SnackBar(content: Text(i18n.sendFailedToGetFeesError)));
+        showBrandToast(context, i18n.sendFailedToGetFeesError);
       }
     }
   }
@@ -459,7 +453,7 @@ class _SendScreenState extends State<SendScreen> {
         }
       } else {
         if (mounted) {
-          ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(i18n.unknownError)));
+          showBrandToast(context, i18n.unknownError);
         }
       }
     }
@@ -536,13 +530,13 @@ class _SendScreenState extends State<SendScreen> {
         errorMsg = 'Failed to send transaction. You might have insufficient unlocked balance.';
       }
       if (mounted) {
-        ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(errorMsg)));
+        showBrandToast(context, errorMsg);
       }
       rethrow;
     } catch (error) {
       log(LogLevel.error, error.toString());
       if (mounted) {
-        ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(i18n.unknownError)));
+        showBrandToast(context, i18n.unknownError);
       }
       rethrow;
     }
diff --git a/lib/screens/settings.dart b/lib/screens/settings.dart
index ec076d5..7355ce5 100644
--- a/lib/screens/settings.dart
+++ b/lib/screens/settings.dart
@@ -114,9 +114,7 @@ class _SettingsScreenState extends State<SettingsScreen> {
       // Enabling app-lock is an explicit opt-in, so decline and error both report.
       if (result != BiometricAuthResult.authenticated) {
         if (mounted) {
-          ScaffoldMessenger.of(
-            context,
-          ).showSnackBar(SnackBar(content: Text(i18n.settingsAppLockUnableToAuthError)));
+          showBrandToast(context, i18n.settingsAppLockUnableToAuthError);
         }
         return;
       }
@@ -145,9 +143,7 @@ class _SettingsScreenState extends State<SettingsScreen> {
 
       if (logFiles.isEmpty) {
         if (mounted) {
-          ScaffoldMessenger.of(
-            context,
-          ).showSnackBar(SnackBar(content: Text(i18n.settingsExportLogsError)));
+          showBrandToast(context, i18n.settingsExportLogsError);
         }
         return;
       }
@@ -165,9 +161,7 @@ class _SettingsScreenState extends State<SettingsScreen> {
       }
     } catch (e) {
       if (mounted) {
-        ScaffoldMessenger.of(
-          context,
-        ).showSnackBar(SnackBar(content: Text(i18n.settingsExportLogsError)));
+        showBrandToast(context, i18n.settingsExportLogsError);
       }
     }
   }
diff --git a/lib/screens/unlock.dart b/lib/screens/unlock.dart
index ef61a93..a37bd05 100644
--- a/lib/screens/unlock.dart
+++ b/lib/screens/unlock.dart
@@ -45,9 +45,7 @@ class _UnlockScreenState extends State<UnlockScreen> {
       if (mounted) Navigator.pushReplacementNamed(context, '/wallet_home');
     } else if (result == BiometricAuthResult.error) {
       if (mounted) {
-        ScaffoldMessenger.of(
-          context,
-        ).showSnackBar(SnackBar(content: Text(i18n.unlockUnableToAuthError)));
+        showBrandToast(context, i18n.unlockUnableToAuthError);
       }
     }
   }
diff --git a/lib/screens/wallet_home.dart b/lib/screens/wallet_home.dart
index d6241b4..9b3c7e5 100644
--- a/lib/screens/wallet_home.dart
+++ b/lib/screens/wallet_home.dart
@@ -63,9 +63,7 @@ class _WalletHomeScreenState extends State<WalletHomeScreen> {
   void _showTxSuccessToast() {
     final i18n = AppLocalizations.of(context)!;
 
-    ScaffoldMessenger.of(
-      context,
-    ).showSnackBar(SnackBar(content: Text(i18n.sendTransactionSuccessfullySent)));
+    showBrandToast(context, i18n.sendTransactionSuccessfullySent);
   }
 
   @override
diff --git a/lib/widgets/connection_settings_form.dart b/lib/widgets/connection_settings_form.dart
index 0906814..925b666 100644
--- a/lib/widgets/connection_settings_form.dart
+++ b/lib/widgets/connection_settings_form.dart
@@ -171,9 +171,7 @@ class _ConnectionSettingsFormState extends State<ConnectionSettingsForm> {
               _errorMessage = i18n.lwsSetupInvalidQrCode;
             });
           } else {
-            ScaffoldMessenger.of(
-              context,
-            ).showSnackBar(SnackBar(content: Text(i18n.lwsSetupInvalidQrCode)));
+            showBrandToast(context, i18n.lwsSetupInvalidQrCode);
           }
         }
       }
@@ -204,15 +202,10 @@ class _ConnectionSettingsFormState extends State<ConnectionSettingsForm> {
     });
 
     if (hadProtocol) {
-      ScaffoldMessenger.of(context)
-        ..hideCurrentSnackBar()
-        ..showSnackBar(
-          SnackBar(
-            content: Text(
-              addressUsesSsl(value) ? i18n.connectionProtocolHttps : i18n.connectionProtocolHttp,
-            ),
-          ),
-        );
+      showBrandToast(
+        context,
+        addressUsesSsl(value) ? i18n.connectionProtocolHttps : i18n.connectionProtocolHttp,
+      );
     }
   }
 
@@ -303,9 +296,7 @@ class _ConnectionSettingsFormState extends State<ConnectionSettingsForm> {
     }
 
     if (_useTor && TorSettingsService.sharedInstance.torMode == TorMode.disabled) {
-      ScaffoldMessenger.of(
-        context,
-      ).showSnackBar(SnackBar(content: Text(i18n.lwsSetupTorDisabledError)));
+      showBrandToast(context, i18n.lwsSetupTorDisabledError);
       return;
     }