Add remaining UI assets and configuration files

- Add assets/ directory with icons and images
- Add eslint.config.js for code linting
- Add package-lock.json for dependency locking
- Add public/ directory with static assets
- Add ui/ directory with React components

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

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

ui/design-tokens.json

@@ -0,0 +1,12 @@
+{
+  "colors": {
+    "primary": "#007bff",
+    "secondary": "#6c757d",
+    "background": "#f8f9fa",
+    "text": "#212529"
+  },
+  "typography": {
+    "fontFamily": "-apple-system, BlinkMacSystemFont, \"Segoe UI\", Roboto, \"Helvetica Neue\", Arial, sans-serif",
+    "fontSize": "16px"
+  }
+}