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/utils/blurHash.ts

@@ -3,7 +3,7 @@ import { encode, isBlurhashValid } from 'blurhash';
 export const encodeBlurHash = (
   img: HTMLImageElement | HTMLVideoElement,
   width?: number,
-  height?: number
+  height?: number,
 ): string | undefined => {
   const imgWidth = img instanceof HTMLVideoElement ? img.videoWidth : img.width;
   const imgHeight = img instanceof HTMLVideoElement ? img.videoHeight : img.height;