useBookmarks / useReminders / useUserNotes were near-verbatim copies of a
concurrency-critical engine (module-scoped singleton, per-client
subscribe/teardown, a serialized write-queue that prevents lost-update
clobbering, a listener Set, and the account-data subscription).
Extract it into createAccountDataListStore<T, C>({ eventType, read, write }) in
src/app/hooks/createAccountDataListStore.ts. The write-serialization semantics
are preserved identically (still the lost-update fix). The differing payload
shapes are parameterized via read/write: bookmarks/reminders wrap a list
({bookmarks}/{reminders}); notes is a flat Record passed through unchanged.
The three hooks become thin wrappers with their exact public APIs unchanged
(same exported names, signatures, return shapes, and mutators), so no call site
changes. The DP16 setAccountData helper is used inside the queue.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
