feat(save): write synced baselines for structured fields

Save-model v2 reconciles a field by diffing its live value against a baseline last synced from Linear, but the structured fields (priority, state, assignee, labels) only stored their current value — there was nothing to diff against. The renderer now writes a synced baseline beside each: LINEAR-PRIORITY (the numeric priority), LINEAR-STATE-ID-SYNCED, LINEAR-ASSIGNEE-ID-SYNCED, and LINEAR-LABEL-IDS / LINEAR-LABEL-IDS-SYNCED (the live and baseline id sets, with LINEAR-LABELS staying display-only names).

At fetch, live equals baseline, so nothing reads dirty on a fresh issue. The merge refresh re-renders changed subtrees through the same renderer, so baselines advance there too, and a retained dirty subtree is left untouched.

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