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/useRoomPermissions.ts

@@ -15,7 +15,7 @@ export type RoomPermissionsAPI = {
 
 export const getRoomPermissionsAPI = (
   creators: Set<string>,
-  powerLevels: IPowerLevels
+  powerLevels: IPowerLevels,
 ): RoomPermissionsAPI => {
   const api: RoomPermissionsAPI = {
     event: (type, userId) => {
@@ -49,11 +49,11 @@ export const getRoomPermissionsAPI = (
 
 export const useRoomPermissions = (
   creators: Set<string>,
-  powerLevels: IPowerLevels
+  powerLevels: IPowerLevels,
 ): RoomPermissionsAPI => {
   const api: RoomPermissionsAPI = useMemo(
     () => getRoomPermissionsAPI(creators, powerLevels),
-    [creators, powerLevels]
+    [creators, powerLevels],
   );
 
   return api;