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/room/RoomViewHeader.tsx

@@ -303,7 +303,7 @@ const CallMenu = forwardRef<HTMLDivElement, CallMenuProps>(
         </Box>
       </Menu>
     );
-  }
+  },
 );
 
 function CallButton() {
@@ -398,7 +398,7 @@ export function RoomViewHeader({ callView }: { callView?: boolean }) {
 
   const hasCallPermission = permissions.stateEvent(
     StateEvent.GroupCallMemberPrefix,
-    mx.getSafeUserId()
+    mx.getSafeUserId(),
   );
   const livekitSupported = useLivekitSupport();
   const rtcSupported = webRTCSupported();
@@ -414,7 +414,7 @@ export function RoomViewHeader({ callView }: { callView?: boolean }) {
   const name = useRoomName(room);
   const topic = useRoomTopic(room);
   const avatarUrl = avatarMxc
-    ? mxcUrlToHttp(mx, avatarMxc, useAuthentication, 96, 96, 'crop') ?? undefined
+    ? (mxcUrlToHttp(mx, avatarMxc, useAuthentication, 96, 96, 'crop') ?? undefined)
     : undefined;
 
   const [peopleDrawer, setPeopleDrawer] = useSetting(settingsAtom, 'isPeopleDrawer');