fix(data-table): preserve active filter when rows prop changes

[metonym]

When ToolbarSearch (or any consumer) calls filterRows, the visible rows are stored in $tableRows while originalRows keeps the full set. As soon as the parent re-assigns rows (e.g. after a fetch), the reactive resets originalRows = [...rows]; $tableRows = rows; and the user's search is wiped without warning, even though the search input still shows the query.

The fix is to track the last filterRows inputs and replay them when rows is reassigned, so consumers calling filterRows via context don't silently lose the filter on row updates.

Svelte REPL repro: https://svelte.dev/playground/a43647f2061240ec9ef6b4852b15ca95?version=latest