Tor, Decimal fixes

### lib/models/monero_wallet_adapter.dart
@@ -10,7 +10,7 @@ import 'package:wallet_monero/wallet_monero.dart' show MoneroWallet;
 
 const _moneroDecimals = 12;
 
-/// Whether a bare `host:port` [address] gets a secure transport (D30).
+/// Whether a bare `host:port` [address] gets a secure transport.
 ///
 /// wallet-core no longer stores a `useSsl` flag; the scheme is derived from the
 /// host — https for a routable one, plaintext for an onion or local one. This

### lib/screens/send.dart
@@ -315,7 +315,7 @@ class _SendScreenState extends State<SendScreen> {
       return false;
     }
 
-    if (amount > (wallet.unlockedBalance ?? 0)) {
+    if (_amountUnits() > (wallet.unlockedBalanceBaseUnits ?? BigInt.zero)) {
       if (setErrors) {
         setState(() {
           _amountError = i18n.sendInsufficientBalanceError;
@@ -602,17 +602,28 @@ class _SendScreenState extends State<SendScreen> {
     await _revalidate();
   }
 
+  /// The typed amount in piconero, or zero when the field is not a number.
+  BigInt _amountUnits() {
+    try {
+      return decimalToBaseUnits(_amountController.text, _xmrDecimals);
+    } on FormatException {
+      return BigInt.zero;
+    }
+  }
+
   Future<void> _onAmountChanged() async {
     final wallet = appWalletOf(context);
-    final amount = double.tryParse(_amountController.text) ?? 0;
+    // Base units for the same reason as in `_validateForm`: `==` between two
+    // differently-rounded doubles decided whether this is a sweep.
+    final isFullBalance = _amountUnits() == wallet.unlockedBalanceBaseUnits;
 
-    if (amount == wallet.unlockedBalance! && !_isSweepAll) {
+    if (isFullBalance && !_isSweepAll) {
       setState(() {
         _isSweepAll = true;
       });
     }
 
-    if (amount != wallet.unlockedBalance! && _isSweepAll) {
+    if (!isFullBalance && _isSweepAll) {
       setState(() {
         _isSweepAll = false;
       });

### lib/util/logging.dart
@@ -1,4 +1,4 @@
-// The whole logger lives in wallet-core (wallet_infra, D25): the log() API +
+// The whole logger lives in wallet-core (wallet_infra): the log() API +
 // formatter, the verbose gate, the file sink (FileLogSink), log rotation
 // (cleanOldLogFiles), and file listing/export. The app only installs the sink
 // (console + file) in wallet_core_glue.dart.

### lib/util/secure_clipboard.dart
@@ -1,5 +1,5 @@
 // SecureClipboard lives in wallet-core (`wallet_infra`) with a fixed, app-neutral
-// MethodChannel name (`org.magicgrants.wallet/secure_clipboard`, per D10). Kept
+// MethodChannel name (`org.magicgrants.wallet/secure_clipboard`). Kept
 // under the same import path so call sites are unchanged; the native handler is
 // registered under that name in MainActivity.kt / AppDelegate.swift.
 export 'package:wallet_infra/wallet_infra.dart' show SecureClipboard;

### lib/wallet_core_glue.dart
@@ -62,7 +62,7 @@ void installWalletCore() {
 
   FiatRates.install(getTorProxy: TorSettingsService.sharedInstance.getProxy);
 
-  // The whole logger lives in wallet-core now (D25): console + file sinks fan out
+  // The whole logger lives in wallet-core now: console + file sinks fan out
   // from one installed sink; the file sink is verbose-gated internally.
   wcore.WalletLog.sink = wcore.CompositeLogSink([
     const wcore.DebugPrintLogSink(),
@@ -99,6 +99,14 @@ void installWalletCore() {
 /// wallet connects through. (Background open + the node/Tor gate now live inside
 /// `wallet_background`.)
 Future<bool> _ensureTorConnected() async {
+  final settings = TorSettingsService.sharedInstance;
+  await settings.ensureLoaded();
+  if (settings.torMode != TorMode.builtIn) {
+    // External: the proxy is the user's, and `getProxy` fails closed if it is
+    // not usable. Disabled: there is no Tor to report.
+    return settings.torMode == TorMode.external;
+  }
+
   await TorService.sharedInstance.start();
   return TorService.sharedInstance.waitUntilConnected(timeout: const Duration(minutes: 2));
 }
@@ -156,7 +164,7 @@ AppWallet appWalletOf(BuildContext context, {bool listen = false}) {
 CryptoWallet? xmrWallet(BuildContext context) =>
     Provider.of<WalletManager>(context, listen: false).getWallet('XMR');
 
-/// Shows the shared tx-details sheet (`wallet_ui`, D24) for [tx] from the tx
+/// Shows the shared tx-details sheet (`wallet_ui`) for [tx] from the tx
 /// list. The activity list now renders the engine's wallet_domain TxDetails
 /// directly, so no neutral-to-engine bridge is needed.
 void showTxDetailsDialog(BuildContext context, TxDetails tx) {

### lib/widgets/tx_details.dart
@@ -5,7 +5,7 @@ import 'package:wallet_domain/wallet_domain.dart' show CryptoWallet, TxDetails;
 import 'package:wallet_ui/wallet_ui.dart' show TxDetailsSheetLabels, showTxDetailsSheet;
 
 /// The tx-details popup is the shared brand bottom sheet in wallet-core
-/// (`wallet_ui`, D24), localization-agnostic. This adapter keeps the app's call
+/// (`wallet_ui`), localization-agnostic. This adapter keeps the app's call
 /// site unchanged and supplies Skylight's translated strings (incl. the status
 /// banner).
 class TxDetailsDialog {

### lib/widgets/ui/ui.dart
@@ -1,5 +1,5 @@
 /// Skylight's brand widget set — the shared design tokens + primitives from the
-/// `wallet_ui` package (D24). This barrel re-exports them so screens import one
+/// `wallet_ui` package. This barrel re-exports them so screens import one
 /// path.
 library;