Update getUniqueKey to use fallback for undefined IDs

[Avi-ADAM]

function getUniqueKey(row) {
return uniqueRowIds.find(x => x.row.id === row.id)?.id;
}

uniqueRowIds and the rendered gridData are populated by two separate $effects that both react to the filtered data changing. Clicking a filter button changes filteredActs, which can update gridData (via the grid derived) and uniqueRowIds in different reactive ticks. In that transient mismatch, some rows in gridData have no matching entry in the (temporarily stale) uniqueRowIds, so getUniqueKey returns undefined for more than one row → Svelte's each_key_duplicate error.

Fix

the key always falls back to the row's own id (which is always defined and unique in your data) instead of failing when the lookup race happens:

• return uniqueRowIds.find(x => x.row.id === row.id)?.id;

• return uniqueRowIds.find(x => x.row.id === row.id)?.id ?? row?.id ?? row;