Filament 3: Enforce unique “name” across nested Builder/Repeater items and show per-field errors (not parent)

Question

• Goal: Prevent duplicate field name values in a dynamic form builder, and show the validation error next to the offending TextInput, not at the end of the builder.
• Structure: A SectionsBuilder (custom) contains a FormBuilder (custom). Each form field has a TextInput::make('name').

What I tried:

• Added ->distinct() to the shared TextInput('name') used by all field components (Filament 3.2).
• Tried parent-level ->rule() closures on SectionsBuilder / FormBuilder that scan the array and call $fail(...).

Problems:

• ->distinct() doesn’t seem to enforce uniqueness across items spanning multiple sections (nested structure).
• Parent ->rule() validates, but the error shows on the parent component (bottom of the builder), not on the specific name inputs.

How can I:

1. Enforce uniqueness of name across all items, including across sections.
2. Show validation errors next to each duplicate TextInput('name'), not only on the parent?

Environment:

• Filament 3.2

Relevant code (from my project)

private function getNameAttribute(): TextInput
{
    return TextInput::make('name')
        ->label(__('form-builder.props.name'))
        ->helperText(__('form-builder.helpers.name'))
        ->alphaDash()
        ->required()
        ->distinct()
        ->minLength(2)
        ->maxLength(50)
        ->autofocus()
        ->autocomplete(false);
}
return [
    SectionsBuilder::make('schema.sections')->schema([
        FormBuilder::make('fields')
            ->formComponents([
                StringField::class,
                NumberField::class,
                CheckboxField::class,
                TextareaField::class,
                SelectField::class,
                DateField::class,
                Header::class,
                Paragraph::class,
                SignatureField::class,
                PhoneNumberField::class,
            ])
            ->componentPickerColumns()
            ->data([
                'docTypes' => $this->documentTypes,
            ])
            ->preview($this->getRecord()->status == SchemaStatus::Archived)
            ->afterStateUpdated(function () {
                if ($this->getRecord()->status == SchemaStatus::Draft) {
                    $this->save(shouldSendSavedNotification: false);
                }
            }),
    ])
    // ...
];

Minimal reproducible (simplified)

Builder::make('sections')->schema([
    // Each section has nested fields
    Repeater::make('fields')->schema([
        TextInput::make('name')->required()->distinct(), // want uniqueness across ALL sections
    ]),
]);

Desired behavior:

If two items anywhere (even across sections) have the same name, show the error directly under each offending TextInput, not on the parent.

Questions

• Does ->distinct() support cross-nested validation scopes, or only direct siblings within a single repeater/builder?
• If cross-section uniqueness needs a parent-level rule, how can I map failures to each duplicate child field so errors render on the corresponding TextInput('name')?
• Is there a recommended Filament 3 way to assign validation errors to specific nested item paths (e.g., sections.0.fields.2.name) from a parent ->rule() closure?