fix: add mounted guard after async network calls in AmountScreen

[Delgado74]

Summary

Closes #67

Adds if (!mounted) return; guards after async network calls in _processLNURLPayment and _processLightningAddressPayment to prevent potential crashes when the user navigates away during an in-flight payment request.

Problem

After await _invoiceService.sendPaymentToLNURL(...) and await _invoiceService.sendPaymentToLightningAddress(...), the code calls _showPendingSnackBar, _showSuccessSnackBar, and Navigator.of(context).popUntil without checking if the widget is still mounted. If the user presses back while the request is in flight:

• The widget's BuildContext becomes invalid
• Accessing context.tokens or ScaffoldMessenger.of(context) can throw an exception

While timing may prevent a crash in many cases (fast response, slow user), the race condition exists and eliminating it is trivial.

Changes

File	Change
lib/screens/11amount_screen.dart	Added if (!mounted) return; after the two async network calls (lines +415, +494)

Testing

flutter analyze passes with no new issues.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

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Run ID: d9185e9a-dcff-458d-830c-b8fa429bd827

📥 Commits

Reviewing files that changed from the base of the PR and between 5b51629 and eb6ff1a.

📒 Files selected for processing (1)

• lib/screens/11amount_screen.dart

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