TypeError: Unsupported operand types: int + string in UserPointsDetails->calculateUsablePoints()

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## **Title:**
```
TypeError: Unsupported operand types: int + string in UserPointsDetails->calculateUsablePoints()
```

## **Body:**
```

Problem

The calculateUsablePoints() method in UserPointsDetails.php throws a TypeError when trying to add string values returned by getString() to numeric variables.

Error

TypeError: Unsupported operand types: int + string in Drupal\commerce_user_points\UserPointsDetails->calculateUsablePoints() (line 79)

Root Cause

Lines 78-79 use getString() which returns strings, but the code tries to add them to numeric variables:

<?php
$totalEarnedPoints += $nodeObject->get('field_earned_points')->getString();
$totalUsedPoints += $nodeObject->get('field_used_points')->getString();
?>

Solution

Replace getString() with direct value access:

<?php
$totalEarnedPoints += $nodeObject->get('field_earned_points')->value;
if (!$nodeObject->get('field_used_points')->isEmpty()) {
  $totalUsedPoints += $nodeObject->get('field_used_points')->value;
}
?>

Steps to reproduce

1. Enable commerce_user_points module
2. Create user points with earned/used points data
3. Access a view that calls calculateUsablePoints()
4. Error occurs during calculation

Drupal version: 10.x
Module version: [your version]

```

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