🐛fix: remove unused exports from i18n index and ensure translate function returns correct type (#5419)

web-app/src/i18n/index.ts

@@ -2,7 +2,7 @@
 export { default as i18n, loadTranslations } from './setup'
 
 // Export the React context and hook
-export { TranslationProvider, useAppTranslation, TranslationContext } from './TranslationContext'
+export { TranslationProvider } from './TranslationContext'
 
 // Export types
 export type { I18nInstance, TranslationResources } from './setup'

web-app/src/i18n/setup.ts

@@ -82,7 +82,7 @@ const translate = (key: string, options: Record<string, unknown> = {}): string =
       return current && typeof current === 'object' && current !== null && key in current
         ? (current as Record<string, unknown>)[key]
         : undefined
-    }, obj as unknown)
+    }, obj as unknown) as string | undefined
   }
   
   // Try to get translation from current language