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/usePan.ts

@@ -13,7 +13,7 @@ const INITIAL_PAN = {
 export const usePan = (active: boolean) => {
   const [pan, setPan] = useState<Pan>(INITIAL_PAN);
   const [cursor, setCursor] = useState<'grab' | 'grabbing' | 'initial'>(
-    active ? 'grab' : 'initial'
+    active ? 'grab' : 'initial',
   );
 
   useEffect(() => {
@@ -61,7 +61,7 @@ export const usePan = (active: boolean) => {
       document.removeEventListener('mouseup', handleMouseUp);
       // eslint-disable-next-line react-hooks/exhaustive-deps
     },
-    []
+    [],
   );
 
   return {