Modernize collaborative pixel art platform to production-ready architecture

Major refactor from simple HTML/JS app to modern full-stack TypeScript application:

## Architecture Changes
- Migrated to monorepo structure with workspaces (backend, frontend, shared)
- Backend: Node.js + Express + TypeScript + Socket.IO
- Frontend: Next.js 15.5 + React 19 + TypeScript + Tailwind CSS
- Shared: Common types and utilities across packages

## Key Features Implemented
- Real-time WebSocket collaboration via Socket.IO
- Virtual canvas with chunked loading for performance
- Modern UI with dark mode and responsive design
- Mock database system for easy development (Redis/PostgreSQL compatible)
- Comprehensive error handling and rate limiting
- User presence and cursor tracking
- Infinite canvas support with zoom/pan controls

## Performance Optimizations
- Canvas virtualization - only renders visible viewport
- Chunked pixel data loading (64x64 pixel chunks)
- Optimized WebSocket protocol
- Memory-efficient state management with Zustand

## Development Experience
- Full TypeScript support across all packages
- Hot reload for both frontend and backend
- Docker support for production deployment
- Comprehensive linting and formatting
- Automated development server startup

## Fixed Issues
- Corrected start script paths
- Updated environment configuration
- Fixed ESLint configuration issues
- Ensured all dependencies are properly installed
- Verified build process works correctly

frontend/src/components/ui/ZoomControls.tsx

@@ -0,0 +1,51 @@
+'use client';
+
+import { motion } from 'framer-motion';
+
+interface ZoomControlsProps {
+  zoom: number;
+  onZoomIn: () => void;
+  onZoomOut: () => void;
+}
+
+export function ZoomControls({ zoom, onZoomIn, onZoomOut }: ZoomControlsProps) {
+  return (
+    <motion.div
+      className="fixed bottom-4 right-4 sm:bottom-6 sm:right-6 z-40"
+      initial={{ opacity: 0, scale: 0.8 }}
+      animate={{ opacity: 1, scale: 1 }}
+      transition={{ type: "spring", stiffness: 400, damping: 25 }}
+    >
+      <div className="flex flex-col gap-2 sm:gap-3">
+        {/* Zoom In Button */}
+        <motion.button
+          className="w-12 h-12 sm:w-14 sm:h-14 bg-white/10 backdrop-blur-2xl rounded-full border border-white/20 shadow-lg ring-1 ring-white/10 flex items-center justify-center text-white text-xl sm:text-2xl font-bold hover:bg-white/20 active:bg-white/30 transition-all duration-200 select-none touch-manipulation"
+          onClick={onZoomIn}
+          whileHover={{ scale: 1.1 }}
+          whileTap={{ scale: 0.9 }}
+          transition={{ type: "spring", stiffness: 400 }}
+        >
+          +
+        </motion.button>
+
+        {/* Zoom Out Button */}
+        <motion.button
+          className="w-12 h-12 sm:w-14 sm:h-14 bg-white/10 backdrop-blur-2xl rounded-full border border-white/20 shadow-lg ring-1 ring-white/10 flex items-center justify-center text-white text-xl sm:text-2xl font-bold hover:bg-white/20 active:bg-white/30 transition-all duration-200 select-none touch-manipulation"
+          onClick={onZoomOut}
+          whileHover={{ scale: 1.1 }}
+          whileTap={{ scale: 0.9 }}
+          transition={{ type: "spring", stiffness: 400 }}
+        >
+          −
+        </motion.button>
+
+        {/* Zoom Display */}
+        <div className="bg-white/5 backdrop-blur-2xl rounded-xl sm:rounded-2xl px-2 py-1 sm:px-3 sm:py-2 border border-white/20 shadow-lg ring-1 ring-white/10">
+          <div className="text-white font-bold text-xs sm:text-sm text-center min-w-[40px] sm:min-w-[50px]">
+            {Math.round(zoom * 100)}%
+          </div>
+        </div>
+      </div>
+    </motion.div>
+  );
+}