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/vite.config.ts

@@ -0,0 +1,7 @@
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+
+// https://vite.dev/config/
+export default defineConfig({
+  plugins: [react()],
+})