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/page/Page.tsx

@@ -53,7 +53,7 @@ export const PageNavHeader = as<'header', css.PageNavHeaderVariants>(
       {...props}
       ref={ref}
     />
-  )
+  ),
 );
 
 export function PageNavContent({
@@ -98,7 +98,7 @@ export const PageHeader = as<'div', css.PageHeaderVariants>(
       {...props}
       ref={ref}
     />
-  )
+  ),
 );
 
 export const PageContent = as<'div'>(({ className, ...props }, ref) => (
@@ -127,7 +127,7 @@ export const PageHeroSection = as<'div', ComponentProps<typeof Box>>(
       {...props}
       ref={ref}
     />
-  )
+  ),
 );
 
 export function PageHero({