feat: add client-side rate limiting to contact form

- Added `useRateLimit` hook
- Integrated hook into `Contact.tsx`
- Added translations for rate limit error
- Added unit tests
- Fixed type error in `Button.tsx` to allow build to pass

src/components/ui/Button.tsx

@@ -2,7 +2,7 @@ import { type ReactNode, type ButtonHTMLAttributes } from 'react';
 import { motion } from 'motion/react';
 import styles from './Button.module.css';
 
-interface ButtonProps extends ButtonHTMLAttributes<HTMLButtonElement> {
+interface ButtonProps extends Omit<ButtonHTMLAttributes<HTMLButtonElement>, 'onAnimationStart' | 'onDragStart' | 'onDragEnd' | 'onDrag'> {
   variant?: 'primary' | 'secondary' | 'outline';
   size?: 'sm' | 'md' | 'lg';
   children: ReactNode;