Release version 1.2.3 - Admin UI styling improvements

Fixed two admin UI bugs:
- Applied borderless table styling to all tier/package tables for consistency
- Fixed checkbox tooltip display and improved checkbox-label spacing

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

includes/class-wc-tpp-product-meta.php

@@ -210,6 +210,7 @@ if (!class_exists('WC_TPP_Product_Meta')) {
                     'name' => 'wc_tpp_restrict_to_packages[' . $loop . ']',
                     'label' => __('Restrict to Package Quantities', 'wc-tier-package-prices'),
                     'description' => __('Only allow quantities defined in packages above', 'wc-tier-package-prices'),
+                    'desc_tip' => true,
                     'value' => $restrict,
                     'cbvalue' => 'yes',
                     'wrapper_class' => 'form-row form-row-full'