Widget: Redesigned chat UI and npm package

The widget got a full redesign and is now available as supportwire-widget on npm.

• Glassmorphism message bubbles with frosted glass backgrounds
• Gradient glow trigger button, fullscreen image preview
• Responsive layout from 320px to 1440px
• Rich text editor for message input
• Unread badge and notification sound on new messages
• Install with bun add supportwire-widget or npm install supportwire-widget
• Configure with domain, user token, and app URL
• Programmatic API: send messages, trigger open/close, hook into events