chore: upgrade i18next 26, prettier 3, fontsource-variable, domhandler 6, lint-staged 17

- i18next 23->26 + react-i18next 15->17
- prettier 2->3, reformat all files
- replace @fontsource/inter with @fontsource-variable/inter 5, update import path
- domhandler 5->6 (aligns with transitive deps)
- lint-staged 16->17

src/app/hooks/useDebounce.ts

@@ -8,7 +8,7 @@ export type DebounceCallback<T extends unknown[]> = (...args: T) => void;
 
 export function useDebounce<T extends unknown[]>(
   callback: DebounceCallback<T>,
-  options?: DebounceOptions
+  options?: DebounceOptions,
 ): DebounceCallback<T> {
   const timeoutIdRef = useRef<number>();
   const { wait, immediate } = options ?? {};
@@ -27,7 +27,7 @@ export function useDebounce<T extends unknown[]>(
         timeoutIdRef.current = undefined;
       }, wait);
     },
-    [callback, wait, immediate]
+    [callback, wait, immediate],
   );
 
   return debounceCallback;