refactor: clean up codebase by removing redundant comments

Remove unnecessary JSDoc comments and redundant explanations from components, types, and data files. Simplify code structure while maintaining functionality.

Clean up language handling logic in components by removing redundant comments and simplifying state management. Move type imports to dedicated type import statements where applicable.

src/types/i18n.ts

@@ -1,36 +1,17 @@
-/**
- * Internationalization types module
- * Contains type definitions for i18n functionality
- */
 import { languages } from '@/i18n/translations';
 
-/**
- * Language type definition
- */
 export type Lang = keyof typeof languages;
 
-/**
- * UI translation keys type
- */
 export type UiKeys = string;
 
-/**
- * Language switcher component props
- */
 export interface LanguageSwitcherProps {
   lang: Lang;
 }
 
-/**
- * Glass header component props
- */
 export interface GlassHeaderProps {
   lang: Lang;
 }
 
-/**
- * Footer component props
- */
 export interface FooterProps {
   lang?: Lang;
 }