Add AGENTS.md with codebase guidelines and commands

AGENTS.md

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+# AGENTS.md
+
+## Build, Lint, and Test Commands
+
+### Build Commands
+- `npm run build` - Build the application for production
+- `npm run dev` - Start development server with hot reloading
+- `npm run preview` - Preview the production build
+
+### Lint Commands
+- `npm run lint` - Run ESLint on the entire codebase
+- `npm run lint -- --fix` - Run ESLint with auto-fix capabilities
+
+### Test Commands
+- No test framework configured yet
+- For running individual tests, add a test runner like Vitest or Jest
+- Example with Vitest: `npm run test -- --run --reporter=verbose`
+
+## Code Style Guidelines
+
+### Imports
+- Use ES6 module syntax: `import { foo } from 'bar'`
+- Group imports: standard library, external dependencies, internal modules
+- Avoid wildcard imports: `import * as React from 'react'`
+- Use named imports for better tree-shaking
+
+### Formatting
+- Use Prettier for code formatting (configured via .prettierrc)
+- 2-space indentation
+- No semicolons
+- Arrow functions for component methods
+- Type annotations for all props and state
+
+### Types
+- TypeScript strict mode enabled
+- Use interfaces for component props and state shapes
+- Use type aliases for primitive types
+- Use `Partial<T>` for optional updates
+- Use `Record<string, unknown>` for generic object types
+
+### Naming Conventions
+- PascalCase for components and interfaces
+- camelCase for variables and functions
+- UPPER_CASE for constants
+- `use*` prefix for custom hooks
+- `is*`, `has*`, `should*` for boolean values
+
+### Error Handling
+- Use try/catch blocks for async operations
+- Handle errors gracefully in API calls with meaningful error messages
+- Localized error states in components
+- Use custom error boundaries for React components
+- Log errors to console in development only
+
+### React Specific
+- Use functional components with hooks
+- Prefer hooks over class components
+- Use useCallback and useMemo for performance optimization
+- Use StrictMode for development
+- Component composition over inheritance
+- Proper cleanup in useEffect hooks