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* fix(timeline): cursor-paginated timeline to stop long-issue freeze (#1968) Opening an issue from Inbox with thousands of timeline entries used to hard-freeze the browser tab on a synchronous render of every comment + activity. The whole pipeline was unbounded: the API returned every row, TanStack Query cached the full array, and IssueDetail mounted N CommentCards (each running a full react-markdown + lowlight pipeline) in one frame. This swaps the timeline endpoint to keyset cursor pagination and rewires the frontend to useInfiniteQuery so a long issue costs the same as a short one on first paint. API: - GET /issues/:id/timeline now accepts ?before / ?after / ?around (mutex) + ?limit (default 50, max 100); response wraps entries with next/prev cursors and has_more flags. Cursors are opaque base64 (created_at, id). - ?around=<entry_id> anchors a window on the target so Inbox notifications pointing at an old comment never trigger the freeze. - New composite indexes on (issue_id, created_at DESC, id DESC) replace the redundant single-column ones so keyset queries are index-only scans. - /issues/:id/comments default branch now caps at 50 instead of returning every row unbounded; the unbounded ListComments / ListActivities sqlc queries are deleted. Frontend: - useIssueTimeline switches to useInfiniteQuery, exposes fetchOlder/fetchNewer/jumpToLatest + isAtLatest + newEntriesBelowCount. - WS handlers respect the at-latest invariant: comment/activity:created prepends to pages[0] only when the user is reading the live tail; otherwise it just bumps a counter so the UI offers a "Jump to latest" affordance without yanking scroll. - Optimistic mutations adapted to the InfiniteData shape via shared helpers (mapAllEntries / filterAllEntries / prependToLatestPage in core/issues/timeline-cache.ts) and use setQueriesData so all open windows of the same issue stay in sync. - IssueDetail Activity section gets a TimelineSkeleton placeholder during the brief load window plus subtle text-link load-more buttons matching the existing Subscribe affordance (no Button chrome). Top uses a divider for boundary clarity; bottom shows "Jump to latest · N new" weighted slightly heavier when there's unread state. - highlightCommentId now flows into the hook's around parameter so Inbox jumps fetch the surrounding 50 entries directly. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * chore(agent): default comment list to 50 + prompt hint about long issues The CLI's "multica issue comment list" used to default to --limit 0 (meaning "fetch every comment"), which lets an agent on a long issue fill its context window with thousands of rows. The default is now 50; agents that need older history can pass --limit or --since explicitly. The local-coding-agent prompt also gains a single-line note about this in both the comment-triggered and on-assign flows so the agent knows to scope its fetches when issue size is unknown. Autopilot run-only mode is intentionally unchanged — it has no issue context to query. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>