perf(client): cut background re-renders + duplicate work (#344)

Outside the editor the UI did background work on every tree event, socket
reconnect, and navigation. Tree infra (virtualization/memo/O(N) utils) was
already good — the cost was in the subscriptions and duplicates around it.
Client-only; behavior 1:1.

- Setter-only atom subscriptions → useSetAtom: space-tree-row, use-tree-mutation,
  use-tree-socket no longer subscribe every visible row to the WHOLE treeDataAtom
  value (a tree event re-rendered all ~20-30 rows, bypassing the DocTreeRow memo).
  space-tree-node-menu / mention-list read the tree imperatively (store.get) in
  their handlers only. breadcrumb.tsx uses a selectAtom slice (ancestor chain +
  field equality) instead of the whole-tree subscription.
- Socket handler cleanup (BUG): use-tree-socket + use-query-subscription now
  socket.off() their named handlers on cleanup (were accumulating listeners on
  every reconnect → duplicated invalidations/tree-walks). Mirrors
  use-notification-socket.
- Field-update tree path: invalidateOnUpdatePage does a pointwise patch of the
  cached embed subtrees instead of a blanket invalidatePageTree() (refetch storm);
  structural events keep the blanket invalidate.
- usePageMetaQuery: a content-less select slice for the 13 peripheral subscribers
  that read only title/permissions/id, so they stop re-rendering every ~3s while
  typing / on every collab page.updated (page.tsx keeps the full query for content).
- page.tsx: skeleton + placeholderData keepPreviousData (no blank flash on nav).
- Removed refetchOnMount:true where socket/mutation invalidation already keeps the
  cache fresh (favorite/space/space-watcher/workspace). KEPT it on the 3 queries
  with NO other freshness path (trash-list, created-by, recent-changes) — the
  global default is refetchOnMount:false, so those overrides are load-bearing.
- Small: resize mousemove/up attached only while dragging; per-row emoji-picker
  keydown gated on `opened`; AiChatWindow queries enabled only when the window is
  open.

Gate: client tsc 0, client vitest page+websocket 200 passed (+editor suites),
build ok.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/client/src/features/comment/components/comment-list-with-tabs.tsx

@@ -22,7 +22,7 @@ import CommentEditor from "@/features/comment/components/comment-editor";
 import CommentActions from "@/features/comment/components/comment-actions";
 import { useFocusWithin } from "@mantine/hooks";
 import { IComment } from "@/features/comment/types/comment.types.ts";
-import { usePageQuery } from "@/features/page/queries/page-query.ts";
+import { usePageMetaQuery } from "@/features/page/queries/page-query.ts";
 import { extractPageSlugId } from "@/lib";
 import { useTranslation } from "react-i18next";
 import { useGetSpaceBySlugQuery } from "@/features/space/queries/space-query.ts";
@@ -56,7 +56,7 @@ export function buildChildrenByParent(
 function CommentListWithTabs({ onClose }: CommentListWithTabsProps) {
   const { t } = useTranslation();
   const { pageSlug } = useParams();
-  const { data: page } = usePageQuery({ pageId: extractPageSlugId(pageSlug) });
+  const { data: page } = usePageMetaQuery({ pageId: extractPageSlugId(pageSlug) });
   const {
     data: comments,
     isLoading: isCommentsLoading,