refactor(types): centralize type definitions in shared types file

Move all interface and type definitions to src/types/index.ts to reduce code duplication and improve maintainability. This includes types for components, blog posts, personal info, and localization.

src/components/ShareButtons.tsx

@@ -1,11 +1,5 @@
-import { useState } from 'react';
-import type { Lang } from '../i18n/utils';
-
-interface ShareButtonsProps {
-  lang: Lang;
-  title: string;
-  url?: string;
-}
+import React, { useState } from 'react';
+import { type ShareButtonsProps } from '@/types';
 
 export default function ShareButtons({ lang, title, url }: ShareButtonsProps) {
   const [copied, setCopied] = useState(false);