refactor: fix all lint errors and improve code quality

src/lib/stores/language.svelte.ts

@@ -48,7 +48,7 @@ export const languageStore = new LanguageStore();
 // Helper function to get nested translation value
 export function t(path: string): string {
   const keys = path.split('.');
-  let value: any = languageStore.t;
+  let value: unknown = languageStore.t;
 
   for (const key of keys) {
     if (value && typeof value === 'object' && key in value) {