feat: live session page updates with join link and board preview

[marcodejongh]

Summary

• auto-update the session detail page while a session is in progress using the existing websocket stats flow
• show a Join Session button that links to the board b-route with a session query parameter
• show the board the session runs on with a compact preview under the participants/session overview
• extend shared schema/operations and backend session detail/subscription support for board path and in-progress state
• add/update session detail UI tests for board preview and join-link behavior

Validation

• npm run typecheck --workspace=@boardsesh/shared-schema
• npm run typecheck --workspace=boardsesh-backend
• npm run test:run --workspace=@boardsesh/web -- app/session/tests/session-detail-content.test.tsx
• npm run test:run --workspace=@boardsesh/web -- app/components/sesh-settings/tests/sesh-settings-drawer.test.tsx
• npm run typecheck --workspace=@boardsesh/web (fails due existing .next generated-route validation errors unrelated to this PR)

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Project	Deployment	Actions	Updated (UTC)
boardsesh	Building	Preview, Comment	Mar 2, 2026 5:42pm

[claude]

Claude Review

✅ Ready to merge - Minor issues noted below, but nothing blocking.

Issues

1. Code duplication - SESSION_STATS_SUBSCRIPTION in packages/web/app/lib/graphql/operations/activity-feed.ts:92 duplicates SESSION_STATS from packages/shared-schema/src/operations.ts:273. Import from shared-schema instead.

2. Missing test coverage - No unit tests for mergeStatsIntoSession() function in session-detail-live-shell.tsx:30-54. This merge logic handles tick deduplication and timestamp updates - worth testing edge cases like empty ticks arrays.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Subscribe before taking session stats snapshot

Fetching initial before attaching the pubsub listener creates a race where ticks logged in between are never delivered: buildSessionStatsUpdatedEvent captures old totals, then pubsub.subscribeSession starts after that point, so the in-between SessionStatsUpdated event is dropped and viewers can remain permanently stale if no later ticks arrive. This resolver should subscribe first (or use the eager iterator path) and then emit a snapshot to avoid missing updates.

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[chatgpt-codex-connector]

Propagate session end state in sessionStats stream

The subscription drops every non-SessionStatsUpdated event, but session termination is published as SessionEnded (from sessions/mutations.ts), so clients using this stream never learn that an in-progress session ended. On the session detail page this leaves isInProgress stale and can keep showing "Join Session" until a hard refresh. The stream needs a way to signal end-of-session state transitions.

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