Adds a server-side run-journal live snapshot (_run_journal_live_snapshot) returned
in GET /api/session as runtime_journal_snapshot, so a FRESH client (another device,
or a tab with no in-memory snapshot) opening an in-progress session immediately sees
the already-streamed assistant text + tool cards rebuilt from the server. Composes
with the existing _replay_run_journal cursor path (seeds lastRunJournalSeq so replay
resumes from the snapshot cutoff, not duplicating it) and keys tool cards by the same
5 id aliases (tid/id/tool_call_id/tool_use_id/call_id) as #3763 so SSE replay replaces
rather than duplicates snapshot cards. Payload values truncated; redaction test added.
Co-authored-by: t3chn0pr13st <technopriest@live.ru>
6bac70d298
