feat: Claude Web UI POC with streaming and tool visualization

Initial implementation of a web-based Claude Code interface with:

Backend (Node.js + Express + WebSocket):
- Claude CLI spawning with JSON stream mode
- Session management with resume support (--continue flag)
- Session history API endpoint
- Real-time WebSocket communication
- --include-partial-messages for live streaming

Frontend (React + Vite + Tailwind):
- Modern dark theme UI (Discord/Slack style)
- Live text streaming with content_block_delta handling
- Markdown rendering with react-markdown + remark-gfm
- Syntax highlighting with react-syntax-highlighter (One Dark)
- Collapsible high-tech tool cards with:
  - Tool-specific icons and colors
  - Compact summaries (Read, Glob, Bash, Edit, etc.)
  - Expandable JSON details
- Session history loading on resume
- Project directory selection
- Resume session toggle

Docker:
- Multi-container setup (backend + nginx frontend)
- Isolated Claude config directory
- Host network mode for backend

Built collaboratively by Neko (VPS Claude) and Web-UI Claude,
with Web-UI Claude implementing most frontend features while
running inside the interface itself (meta-programming!).

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

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

frontend/tailwind.config.js

@@ -0,0 +1,27 @@
+/** @type {import('tailwindcss').Config} */
+export default {
+  content: [
+    "./index.html",
+    "./src/**/*.{js,ts,jsx,tsx}",
+  ],
+  theme: {
+    extend: {
+      colors: {
+        dark: {
+          50: '#f8fafc',
+          100: '#f1f5f9',
+          200: '#e2e8f0',
+          300: '#cbd5e1',
+          400: '#94a3b8',
+          500: '#64748b',
+          600: '#475569',
+          700: '#334155',
+          800: '#1e293b',
+          900: '#0f172a',
+          950: '#020617',
+        }
+      }
+    },
+  },
+  plugins: [],
+}