Floating Cart Button and Rewards Customization

New Features

• Floating cart button
• Announcement bar: multiline support on cart drawer
• Add HEX value input field to all color pickers

Rewards Customization

• Editable progress bar milestone labels (Free gift, Free shipping, Discount off)
• Editable cart items list badges for free gift and free shipping (default: FREE)
• Editable discount off label (e.g. “5% off”, “10% discount”)
• Progress messages card reorganized into collapsible sections
• Improved UI/UX Reward module

Fixes

• Fix double cart drawer on Add to Cart (Flux theme)
• Fix collection endpoints failing on shops using custom domains