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The Threads tab loaded kind-11/1111 with a single #h since-filter and no
limit, so a group with more threads than the relay's default result cap
silently lost the older ones. Mirror the chat history stack for threads:
- RelayGroupChannel.threadsHistory: separate RelayLoadingCursors so paging
the forum doesn't move the chat's cursor.
- buildRelayGroupThreadsHistoryFilters: per-armed-relay #h + kind-11/1111
until+limit page, the forum analog of buildRelayGroupHistoryFilters.
- RelayGroupOpenThreadsHistoryFilterAssembler: the on-demand BackwardRelayPager
("relayGroup.threads.history"), bound to the open group's threadsHistory
cursors, landing on the normal ingest path (kind-11 -> addThread).
- Threads screen: mount the history subscription, eagerly backfill to a
window on open, page older content as the list nears its end, and show a
quiet loading/caught-up footer.
Tests: RelayGroupFilterBuildersTest gains the threads-history filter shape;
RelayGroupFilterServingRelayTest gains a geode backward #h + thread-kinds
walk proving every thread is covered exactly once and the walk terminates.
The screen wiring is device-untested (flagged with the other Tier-D items).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CDK63toGbE7DQxKxrQnhMU