Webapp: Design system, auth, and real-time chat

The SupportWire web app has its foundation in place. A clean design system, proper auth, and real-time chat that actually works.

What's new

• A minimal design system with dark mode, glass effects, and a three-column floating layout.
• Secure authentication with email confirmation.
• Real-time chat with iMessage-style bubbles and a rich text composer.
• File uploads with progress tracking and image previews in conversations.
• Infinite scrolling with cursor-based pagination across conversation lists and messages.
• English and Spanish localization built in from day one.