fix: show current language flag instead of next language in landing page button

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/components/ui/language-switcher.tsx

@@ -38,6 +38,7 @@ export function LanguageSwitcher({ variant = "select" }: LanguageSwitcherProps)
     const currentIndex = languages.findIndex((l) => l.value === locale);
     const nextIndex = (currentIndex + 1) % languages.length;
     const nextLang = languages[nextIndex];
+    const currentLang = languages[currentIndex];
 
     return (
       <Button
@@ -47,7 +48,8 @@ export function LanguageSwitcher({ variant = "select" }: LanguageSwitcherProps)
         className="gap-1.5 text-muted-foreground hover:text-foreground"
       >
         <Globe className="h-4 w-4" />
-        <span className="text-sm">{nextLang.flag}</span>
+        <span className="text-sm">{currentLang.flag}</span>
+        <span className="text-xs font-medium uppercase">{currentLang.value}</span>
       </Button>
     );
   }