#3020: Sync viewed-count in the polling path for actively-viewed sessions
so navigating away doesn't show a stale unread dot. Defensive clear of
completion-unread marker in _setSessionViewedCount.
#2973: Clear elapsed-timer attributes and interval when a live compression
card transitions from running to done, preventing the orphan timer from
overwriting the completed card state. Guarded by active-session check.
Tool card duplication: Route tool_complete result to tc.snippet (detail)
instead of tc.preview (header) to prevent identical content appearing in
both the card header and expanded detail section.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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