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/features/settings/notifications/SystemNotification.tsx

@@ -39,8 +39,8 @@ function EmailNotification() {
           kind: null,
         } as unknown as IPusherRequest);
       },
-      [mx]
-    )
+      [mx],
+    ),
   );
 
   const handleChange = (value: boolean) => {
@@ -89,7 +89,7 @@ export function SystemNotification() {
   const [showNotifications, setShowNotifications] = useSetting(settingsAtom, 'showNotifications');
   const [isNotificationSounds, setIsNotificationSounds] = useSetting(
     settingsAtom,
-    'isNotificationSounds'
+    'isNotificationSounds',
   );
 
   const requestNotificationPermission = () => {