feat(i18n): implement astro i18n integration and refactor locale handling

- Add i18n configuration to astro.config.mjs with default locale and routing
- Refactor language handling to use Astro.currentLocale instead of URL parsing
- Update tsconfig to include only necessary files for better type checking
- Improve LanguageSwitcher to handle routing based on astro i18n config
- Add new translation keys and update components to use dynamic titles
- Simplify MotionWrapper component by removing unused default animations

src/layouts/Layout.astro

@@ -1,14 +1,15 @@
 ---
-import { type Lang, useTranslations } from "@/i18n/utils";
+import { useTranslations, type Lang } from "@/i18n/utils";
+import { defaultLang } from "@/i18n/ui";
 import "../styles/global.css";
 
 interface Props {
   title?: string;
   description?: string;
-  lang: Lang;
 }
 
-const { title = "Rishikesh S - Portfolio", description = "My Portfolio", lang } =
+const lang = Astro.currentLocale as Lang || defaultLang;
+const { title = "Rishikesh S - Portfolio", description = "My Portfolio" } =
   Astro.props;
 const t = useTranslations(lang);
 ---