Fix dark mode selects, notice borders, and double notice icons
- Override WooCommerce's hardcoded #fff on native <select> and Select2
widgets for Bootstrap 5 dark mode (background, color, border)
- Suppress WooCommerce icon font ::before on notices — templates
already render Bootstrap Icons (bi-check-circle, etc.)
- Bump notice selector specificity to .woocommerce .woocommerce-message
(0,2,0) to beat woocommerce.css border-top: 3px solid override
- Explicitly reset border-top shorthand to prevent WooCommerce's
colored top-border from bleeding through
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>