Update .gitignore to include additional file types and directories for Python projects, enhancing environment management and build artifacts exclusion.

.cursor/rules/react.mdc

@@ -0,0 +1,17 @@
+---
+description: "React/TypeScript/Tailwind conventions: components, hooks, strict typing, utility-first styling"
+globs: ["**/*.tsx", "**/*.jsx", "**/*.ts", "**/*.css"]
+---
+# React / TypeScript / Tailwind
+
+- Use TypeScript strict mode; define `Props` interface for every component
+- Use named exports, not default exports
+- Functional components only; use hooks for state/side effects
+- Server Components by default; add `"use client"` only when needed (if Next.js)
+- Use Tailwind utility classes for styling; no CSS modules or inline styles
+- Name event handlers `handle[Action]` (e.g., `handleSubmit`)
+- Use `React.memo` for expensive pure components
+- Implement lazy loading for routes (`React.lazy` + `Suspense`)
+- Organize by feature: `components/`, `hooks/`, `lib/`, `types/`
+- Never use `any`; prefer unknown + type narrowing
+- Use `useCallback`/`useMemo` only when there's a measured perf issue