Settings Page back navigation error and snackbar show error fix

[rohansen856]

Description

Fix for Navigation Issue

Replaced Get.back() with a safer navigation approach in lib/app/modules/settings/views/settings_page_app_bar.dart

// Before
leading: GestureDetector(
  onTap: () {
    Get.back();
  },
  // ...
),

// After
leading: GestureDetector(
  onTap: () {
    if (Get.isSnackbarOpen == true) {
      Get.closeCurrentSnackbar();
    }
    Navigator.of(context).pop();
  },
  // ...
),

This now:

• Checks if a snackbar is open before attempting to close it
• Uses Flutter's standard Navigator.pop() which doesn't automatically try to close snackbars
• Prevents the LateInitializationError by avoiding GetX's automatic snackbar closing logic

Fix for Snackbar Issue

Capture the ScaffoldMessengerState before the async operation to safely show the snackbar later in lib/app/modules/settings/controllers/settings_controller.dart:

// Before
void pickDirectory(BuildContext context) {
  TaskwarriorColorTheme tColors = Theme.of(context).extension<TaskwarriorColorTheme>()!;
  FilePicker.platform.getDirectoryPath().then((value) async {
    // ... async operations ...
    } else if (value == "success") {
      profilesWidget.setBaseDirectory(destination);
      SharedPreferences prefs = await SharedPreferences.getInstance();
      prefs.setString('baseDirectory', destination.path);
      baseDirectory.value = destination.path;
      Get.snackbar(
        'Success',
        'Base directory moved successfully',
        snackPosition: SnackPosition.BOTTOM,
        duration: const Duration(seconds: 2),
      );
    }
  });
}

// After
void pickDirectory(BuildContext context) {
  TaskwarriorColorTheme tColors = Theme.of(context).extension<TaskwarriorColorTheme>()!;
  // Capture ScaffoldMessenger before async operation
  final scaffoldMessenger = ScaffoldMessenger.of(context);
  FilePicker.platform.getDirectoryPath().then((value) async {
    // ... async operations ...
    } else if (value == "success") {
      profilesWidget.setBaseDirectory(destination);
      SharedPreferences prefs = await SharedPreferences.getInstance();
      prefs.setString('baseDirectory', destination.path);
      baseDirectory.value = destination.path;
      // Show success snackbar using captured ScaffoldMessenger
      scaffoldMessenger.showSnackBar(
        SnackBar(
          content: Text(
            'Base directory moved successfully',
            style: TextStyle(color: tColors.primaryTextColor),
          ),
          backgroundColor: tColors.secondaryBackgroundColor,
          duration: const Duration(seconds: 2),
        ),
      );
    }
  });
}

this now:

• Captures the ScaffoldMessengerState early, before any async operations that might invalidate the context
• the captured messenger reference remains valid even after context is deactivated
• uses Flutter's standard snackbar mechanism

Fixes #580

Screenshots

WhatsApp.Video.2026-02-03.at.2.30.34.PM.mp4

Checklist

• Tests have been added or updated to cover the changes
• Documentation has been updated to reflect the changes
• Code follows the established coding style guidelines
• All tests are passing