Fix(qml): Real-time balance updates for confirmations and coinbase maturity

This commit fixes two critical balance update issues in the Android app:

1. Added balanceChanged.emit() on blockchain_updated event
   - Fixes coinbase outputs not showing when they mature (120 blocks)
   - Ensures balance updates when new blocks arrive
   - Resolves issue where only partial mining rewards were displayed

2. Fixed typo: satInt → satsInt in BalanceDetails.qml
   - Lightning swap button now works correctly

Related to previous fix on tx_height_changed event handler.

electrum/gui/qml/components/BalanceDetails.qml

@@ -214,7 +214,7 @@ Pane {
                 Layout.preferredWidth: 1
                 text: qsTr('Lightning swap');
                 visible: Daemon.currentWallet.isLightning
-                enabled: Daemon.currentWallet.lightningCanSend.satsInt > 0 || Daemon.currentWallet.lightningCanReceive.satInt > 0
+                enabled: Daemon.currentWallet.lightningCanSend.satsInt > 0 || Daemon.currentWallet.lightningCanReceive.satsInt > 0
                 icon.source: Qt.resolvedUrl('../../icons/update.png')
                 onClicked: app.startSwap()
             }

electrum/gui/qml/qewallet.py

@@ -242,6 +242,13 @@ class QEWallet(AuthMixin, QObject, QtEventListener):
             self.balanceChanged.emit()
             self.peersUpdated.emit()
 
+    @event_listener
+    def on_event_blockchain_updated(self):
+        # Emit balanceChanged when new block arrives because:
+        # 1. Coinbase outputs might have matured (COINBASE_MATURITY = 120 blocks)
+        # 2. Transaction confirmations increased
+        self.balanceChanged.emit()
+
     @qt_event_listener
     def on_event_payment_succeeded(self, wallet, key):
         if wallet == self.wallet: