Agent Skills: form-helpers

Expert guidance for building forms in Rails 8 applications. Use when creating forms, form_with, form helpers, nested forms, select helpers, file uploads, form builders, accepts_nested_attributes_for, fields_for, collection_select, grouped_collection_select, date/time selects, checkboxes, radio buttons, rich text areas, or any form-related view code. Covers model-backed forms, URL-based forms, complex nested attributes with _destroy, custom form builders, CSRF tokens, strong parameters for nested forms, and Stimulus integration.