fix: Dependent field values not saved on form submission (#4)

[iamgerwin]

Summary

• Fixed dependent field values not being saved when the form is submitted
• The previous fix in v1.0.13 used dynamic string refs which don't work reliably in Vue 3 v-for loops
• Switched to Vue 3's function ref pattern for proper child component access

Changes

• Replaced :ref="'field-' + field.attribute" with :ref="(el) => setFieldRef(field.attribute, el)"
• Added fieldRefs data property to store child field component references
• Added setFieldRef() method to properly collect and manage child component refs
• Updated fill() method to use the new fieldRefs object for accessing child components
• Added cleanup for fieldRefs in beforeUnmount lifecycle hook

Technical Details

• Vue 3 requires function refs when using dynamic ref names in v-for loops
• Dynamic string refs like :ref="'field-' + x" create arrays but are unreliable to access via $refs[key]
• Function refs :ref="(el) => refs[key] = el" provide direct access to component instances

Test Plan

• Verify dependent fields show/hide correctly based on dependency values
• Verify dependent field values are properly saved when form is submitted
• Verify fields inside Flexible layouts work correctly
• Build production assets with no errors