feat(address): add address management system for physical products- create Address model with country enum and has_many :orders association

• add AddressController with CRUD operations supporting JSON and HTML formats
• add AddressesController with create, update, destroy actions and reload parameter
• add address association to Order model (belongs_to :address, required: false)
• add physical attribute to Product model with physical? helper method
• update User model to use has_many :address association with nested attributes
• add migrations for addresses table and order address reference (address_id)
• add address modal UI with form for creating addresses (HTML/JS)
• add address picker and delete functionality in user edit view
• add address selection dropdown for physical product orders in order forms
• add address display in order details view
• add CSS styles for address modal, form elements, and utility classes
• add JavaScript for modal interactions, address deletion, and form submission
• add trash-bin.svg icon for delete button
• update routes to include destroy action for addresses

refactor(order): improve address handling in order creation

• fix conditional logic for accessory cost calculation (separate if blocks)
• add address assignment for physical products during order creation
• update product form to include physical item checkbox

fix(validation): improve form field warning animations

• add fade-out transition for field validation warnings via fade-out class
• add timer-based warning auto-clear functionality (3s delay, 400ms fade)
• add transition properties for border-color and box-shadow on field-invalid

style(application): add CSS utility classes and address styling

• add transition properties for field-invalid class (border-color, box-shadow)
• add fade-out animation for field-validation-warning (opacity transition)
• add .apf-section-darken, .address-trigger-btn, .del-btn utility classes
• add .inline, .jsb, .w100p, .g2r layout utility classes