feat(comments): implement comment resolution for the community build

Add comment resolve/re-open as a community feature, written from scratch on top
of the infrastructure already present in the community codebase: the
resolved_at/resolved_by_id columns, the COMMENT_RESOLVED notification job, the
resolveCommentMark collaboration handler, the commentResolved websocket event,
the comment service/types and the Open/Resolved tabs. No Enterprise-Edition code
is reused and there is no EE feature gating — resolving is available to anyone
who can comment.

Backend:
- add POST /comments/resolve (ResolveCommentDto) guarded by validateCanComment;
  reject resolving replies
- add CommentService.resolveComment: set/clear resolvedAt/resolvedById, sync the
  inline comment mark via collaboration handleYjsEvent, queue
  COMMENT_RESOLVED_NOTIFICATION (only when another user resolves), emit the
  commentResolved websocket event and write a resolve/reopen audit log

Frontend:
- add useResolveCommentMutation with optimistic update + rollback
- add ResolveComment toggle button
- wire the resolve button and menu item into comment-list-item / comment-menu,
  gated on canComment for parent comments

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

apps/client/src/features/comment/queries/comment-query.ts

@@ -8,11 +8,13 @@ import {
   createComment,
   deleteComment,
   getPageComments,
+  resolveComment,
   updateComment,
 } from "@/features/comment/services/comment-service";
 import {
   ICommentParams,
   IComment,
+  IResolveComment,
 } from "@/features/comment/types/comment.types";
 import { notifications } from "@mantine/notifications";
 import { IPagination } from "@/lib/types.ts";
@@ -157,3 +159,86 @@ export function useDeleteCommentMutation(pageId?: string) {
     },
   });
 }
+
+function updateCommentInCache(
+  cache: InfiniteData<IPagination<IComment>>,
+  commentId: string,
+  updater: (comment: IComment) => IComment,
+): InfiniteData<IPagination<IComment>> {
+  return {
+    ...cache,
+    pages: cache.pages.map((page) => ({
+      ...page,
+      items: page.items.map((comment) =>
+        comment.id === commentId ? updater(comment) : comment,
+      ),
+    })),
+  };
+}
+
+export function useResolveCommentMutation() {
+  const queryClient = useQueryClient();
+  const { t } = useTranslation();
+
+  return useMutation({
+    mutationFn: (data: IResolveComment) => resolveComment(data),
+    onMutate: async (variables) => {
+      await queryClient.cancelQueries({ queryKey: RQ_KEY(variables.pageId) });
+      const previousCache = queryClient.getQueryData(RQ_KEY(variables.pageId));
+
+      const cache = previousCache as
+        | InfiniteData<IPagination<IComment>>
+        | undefined;
+      if (cache) {
+        queryClient.setQueryData(
+          RQ_KEY(variables.pageId),
+          updateCommentInCache(cache, variables.commentId, (comment) => ({
+            ...comment,
+            resolvedAt: variables.resolved ? new Date() : null,
+            resolvedById: variables.resolved ? "optimistic" : null,
+            resolvedBy: variables.resolved
+              ? ({ id: "optimistic", name: "", avatarUrl: null } as IComment["resolvedBy"])
+              : null,
+          })),
+        );
+      }
+
+      return { previousCache };
+    },
+    onError: (_err, variables, context) => {
+      if (context?.previousCache) {
+        queryClient.setQueryData(
+          RQ_KEY(variables.pageId),
+          context.previousCache,
+        );
+      }
+      notifications.show({
+        message: t("Failed to resolve comment"),
+        color: "red",
+      });
+    },
+    onSuccess: (data: IComment, variables) => {
+      const cache = queryClient.getQueryData(
+        RQ_KEY(data.pageId),
+      ) as InfiniteData<IPagination<IComment>> | undefined;
+
+      if (cache) {
+        queryClient.setQueryData(
+          RQ_KEY(data.pageId),
+          updateCommentInCache(cache, variables.commentId, (comment) => ({
+            ...comment,
+            resolvedAt: data.resolvedAt,
+            resolvedById: data.resolvedById,
+            resolvedBy: data.resolvedBy,
+          })),
+        );
+      }
+
+      notifications.show({
+        message: variables.resolved
+          ? t("Comment resolved successfully")
+          : t("Comment re-opened successfully"),
+      });
+    },
+  });
+}