A markdown table has no id — it is re-parsed from text on every render, so
any resize state hung off the transcript dies on the next turn. Key the
record by a hash of the header row instead: the same table resolves to the
same key after a re-render, a session switch, or a reload, without the
transcript carrying anything.
Widths are percentages of the table box, never pixels, so a restored table
stays fluid in a narrow pane. The namespace is deliberately disposable —
one key, 64 entries, 7-day expiry, swept on first access. Losing it costs
one drag.
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