fix: Child field values not saved in Flexible layouts (#4)

[iamgerwin]

Summary

• Fixed child field values not being saved when NovaDependencyContainer is used inside nova-flexible-content layouts
• Child fields now correctly receive the Flexible prefix for proper form data submission

Problem

When NovaDependencyContainer was used inside a nova-flexible-content Flexible field:

1. The dependency visibility worked correctly (fields showed/hid based on conditions)
2. BUT the child field values were NOT being saved on form submission
3. This happened because Flexible generates cryptic prefixes (e.g., cDsaj6Ub0m9hChBj__) for field attributes
4. NovaDependencyContainer's child fields were using unprefixed attributes like recipient_email
5. But Flexible expected cDsaj6Ub0m9hChBj__recipient_email in the form data

Solution

Added applyFlexiblePrefixToChildFields() method that:

1. Detects the Flexible context prefix at mount time
2. Applies the prefix to all child field attributes
3. Ensures form data includes the correct prefixed keys

Changes

• resources/js/components/FormField.vue: Added applyFlexiblePrefixToChildFields() method
• dist/js/field.js: Rebuilt production assets
• CHANGELOG.md: Added v1.0.15 release notes

Related

• The dependsOn is not working in the field inside Flexible whitecube/nova-flexible-content#524

Test Plan

• Verify dependent fields show/hide correctly inside Flexible layouts
• Verify dependent field values are saved when form is submitted
• Verify console logs show prefixed attributes being applied
• Build production assets with no errors