data.Store lazy record conversion does not update allItems collection

When a data.Store is filtered, it creates a secondary allItems collection to hold the master, unfiltered dataset. The get() and getAt() methods in data.Store have logic to lazily convert raw data objects into Record instances on-demand. Currently, this conversion only mutates the main _items array (which contains the filtered data). It fails to propagate this conversion to the allItems collection. As a result, if the filter is changed or cleared, the collection is rebuilt from the allItems collection, which still contains the old raw data objects. The newly created Record instances are lost. This can lead to loss of state and broken reactivity for components that rely on Record instances.