Add Web UI

[CarGDev]

Summary

Create a web-based interface for codetyper.

Description

A web UI would allow:

• Browser-based access
• Remote usage without SSH
• Better rich content rendering
• Mobile-friendly interface

Technology Options

• SolidStart - Fast, lightweight (like OpenCode)
• Next.js - React ecosystem
• Astro - Static + islands architecture

Features

• Session management
• File browser
• Chat interface
• Diff viewer
• Syntax highlighting
• Settings panel

Architecture

• Client/server split
• REST/WebSocket API
• Authentication layer
• Session sync between CLI and web

Acceptance Criteria

• Basic web interface
• Chat functionality
• Session viewing
• File browser
• Mobile responsive design