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/components/sequence-card/SequenceCard.tsx

@@ -20,19 +20,19 @@ export const SequenceCard = as<
       mergeBorder,
       ...props
     },
-    ref
+    ref,
   ) => (
     <Box
       as={AsSequenceCard}
       className={classNames(
         css.SequenceCard({ radii, outlined, mergeBorder }),
         ContainerColor({ variant }),
-        className
+        className,
       )}
       data-first-child={firstChild}
       data-last-child={lastChild}
       {...props}
       ref={ref}
     />
-  )
+  ),
 );