fix: use stable keys in InfoGrid

[kavgupt]

The InfoGrid component uses array index as the React key for its items. This is fragile when items can be reordered, inserted, or deleted -- React will reuse DOM nodes incorrectly, leading to stale content or misplaced focus.

Since each item has a label field that is unique within a grid, using item.label as the key gives React a stable identity for each row.

Change: Replaced key={index} with key={item.label} and removed the unused index parameter from the map callback.

This is a one-line semantic improvement -- no visual change, but correct behavior when the items array changes between renders.