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/pages/client/space/Search.tsx

@@ -23,7 +23,7 @@ export function SpaceSearch() {
   const rooms = useSpaceChildren(
     allRoomsAtom,
     space.roomId,
-    useRecursiveChildRoomScopeFactory(mx, mDirects, roomToParents)
+    useRecursiveChildRoomScopeFactory(mx, mDirects, roomToParents),
   );
 
   return (

src/app/pages/client/space/Space.tsx

@@ -109,7 +109,7 @@ const SpaceMenu = forwardRef<HTMLDivElement, SpaceMenuProps>(({ room, requestClo
   const allChild = useSpaceChildren(
     allRoomsAtom,
     room.roomId,
-    useRecursiveChildScopeFactory(mx, roomToParents)
+    useRecursiveChildScopeFactory(mx, roomToParents),
   );
   const unread = useRoomsUnread(allChild, roomToUnreadAtom);
 
@@ -252,7 +252,7 @@ function SpaceHeader() {
 
   const joinRules = useStateEvent(
     space,
-    StateEvent.RoomJoinRules
+    StateEvent.RoomJoinRules,
   )?.getContent<RoomJoinRulesEventContent>();
 
   const handleOpenMenu: MouseEventHandler<HTMLButtonElement> = (evt) => {
@@ -325,7 +325,7 @@ export function SpaceTombstone({ roomId, replacementRoomId }: SpaceTombstoneProp
       return mx.joinRoom(replacementRoomId, {
         viaServers: via,
       });
-    }, [mx, roomId, replacementRoomId])
+    }, [mx, roomId, replacementRoomId]),
   );
   const replacementRoom = mx.getRoom(replacementRoomId);
 
@@ -403,10 +403,10 @@ export function Space() {
             if (a.size !== b.size) return false;
             for (const id of a) if (!b.has(id)) return false;
             return true;
-          }
+          },
         ),
-      []
-    )
+      [],
+    ),
   );
   const allRooms = useAtomValue(allRoomsAtom);
   const allJoinedRooms = useMemo(() => new Set(allRooms), [allRooms]);
@@ -427,7 +427,7 @@ export function Space() {
       }
       return undefined;
     },
-    [mx, allJoinedRooms]
+    [mx, allJoinedRooms],
   );
 
   const hierarchy = useSpaceJoinedHierarchy(
@@ -444,12 +444,12 @@ export function Space() {
           callEmbed?.roomId === roomId;
         return !showRoomAnyway;
       },
-      [space.roomId, closedCategories, roomsWithUnreadSet, selectedRoomId, callEmbed]
+      [space.roomId, closedCategories, roomsWithUnreadSet, selectedRoomId, callEmbed],
     ),
     useCallback(
       (sId) => closedCategories.has(makeNavCategoryId(space.roomId, sId)),
-      [closedCategories, space.roomId]
-    )
+      [closedCategories, space.roomId],
+    ),
   );
 
   const virtualizer = useVirtualizer({
@@ -460,7 +460,7 @@ export function Space() {
   });
 
   const handleCategoryClick = useCategoryHandler(setClosedCategories, (categoryId) =>
-    closedCategories.has(categoryId)
+    closedCategories.has(categoryId),
   );
 
   const getToLink = (roomId: string) =>