When a question_added or question_resolved SSE event fires, the handler
calls renderQuestions() directly — bypassing the snapshotOpenDetails /
restoreOpenDetails pair that refreshState wraps around it. This caused
the answered-history <details> (data-restore-key="q-history") to
collapse every time a question arrived or was resolved while the
operator had it open.
Fix: call snapshotOpenDetails() at the start of renderQuestions() and
restoreOpenDetails() at the end. The double-restore in the refreshState
path is harmless — re-opening an already-open <details> is idempotent,
and restoreOpenDetails is a no-op when the snapshot set is empty.
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