fix: mention closure, onSettled invalidation, cleanup singleton

- Fix Tiptap mention: pass QueryClient via closure from ContentEditor
  instead of getQueryClient() singleton (resolves @mention empty list)
- Add onSettled invalidation to useUpdateIssue (prevents cache drift
  with staleTime: Infinity + self-event WS filter)
- Add cache shape comment to issueListOptions (select transforms
  ListIssuesResponse → Issue[], but cache stores raw response)
- Memoize sidebar inbox dedup computation
- Remove dead getQueryClient/setQueryClient singleton + window property
- Remove ActorSync component and _members/_agents Zustand mirror
  (superseded by closure approach)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/web/core/index.ts

@@ -1,3 +1,3 @@
-export { createQueryClient, getQueryClient, setQueryClient } from "./query-client";
+export { createQueryClient } from "./query-client";
 export { QueryProvider } from "./provider";
 export { useWorkspaceId } from "./hooks";

apps/web/core/issues/mutations.ts

@@ -60,6 +60,9 @@ export function useUpdateIssue() {
       if (ctx?.prevDetail)
         qc.setQueryData(issueKeys.detail(wsId, ctx.id), ctx.prevDetail);
     },
+    onSettled: (_data, _err, vars) => {
+      qc.invalidateQueries({ queryKey: issueKeys.detail(wsId, vars.id) });
+    },
   });
 }
 

apps/web/core/issues/queries.ts

@@ -12,6 +12,11 @@ export const issueKeys = {
     ["issues", "subscribers", issueId] as const,
 };
 
+/**
+ * CACHE SHAPE NOTE: The raw cache stores ListIssuesResponse ({ issues, total }),
+ * but `select` transforms it to Issue[] for consumers. Mutations and ws-updaters
+ * must use setQueryData<ListIssuesResponse>(...) — NOT setQueryData<Issue[]>.
+ */
 export function issueListOptions(wsId: string) {
   return queryOptions({
     queryKey: issueKeys.list(wsId),

apps/web/core/provider.tsx

@@ -3,15 +3,11 @@
 import { useState } from "react";
 import { QueryClientProvider } from "@tanstack/react-query";
 import { ReactQueryDevtools } from "@tanstack/react-query-devtools";
-import { createQueryClient, setQueryClient } from "./query-client";
+import { createQueryClient } from "./query-client";
 import type { ReactNode } from "react";
 
 export function QueryProvider({ children }: { children: ReactNode }) {
-  const [queryClient] = useState(() => {
-    const client = createQueryClient();
-    setQueryClient(client);
-    return client;
-  });
+  const [queryClient] = useState(createQueryClient);
   return (
     <QueryClientProvider client={queryClient}>
       {children}

apps/web/core/query-client.ts

@@ -1,7 +1,5 @@
 import { QueryClient } from "@tanstack/react-query";
 
-let _queryClient: QueryClient | null = null;
-
 export function createQueryClient(): QueryClient {
   return new QueryClient({
     defaultOptions: {
@@ -18,14 +16,3 @@ export function createQueryClient(): QueryClient {
     },
   });
 }
-
-/** Called by QueryProvider on mount to register the singleton. */
-export function setQueryClient(client: QueryClient) {
-  _queryClient = client;
-}
-
-/** Access QueryClient outside React tree (WS handlers, Zustand actions). */
-export function getQueryClient(): QueryClient {
-  if (!_queryClient) throw new Error("QueryClient not initialized");
-  return _queryClient;
-}