Add session-scoped transcription hints

[ComputelessComputer]

Build dynamic transcription hints from session participants, event attendees, dictionary terms, and session metadata with dedupe and caps.

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Note

Low Risk
Local Tinybase reads only; behavior is bounded by tests and a 50-hint cap with no auth or network changes.

Overview
Session transcription hints are expanded so STT gets names and terms in a fixed priority order instead of only dictionary plus note-derived keywords.

useKeywords and getSessionKeywords now pull mapped session participants (mapping_session_participant → humans, skipping source: "excluded") and attendees from the attached calendar event (match event_json tracking_id / calendar_id to events, parse participants_json, omit is_current_user). Those lists are merged ahead of personalization dictionary terms and markdown/hashtag extraction in buildKeywords, then normalized and capped at 50 (MAX_TRANSCRIPTION_HINTS).

KeywordStore gains optional forEachRow for the non-React store path; getSessionTranscriptionHints is the shared implementation. Tests cover ordering, cross-session exclusion, dedupe of case variants, and the cap.

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Cursor Bugbot has reviewed your changes using default effort and found 1 potential issue.

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