QRep mirror UI: partition table sorting/pagination broken and graph shows NaN values

[lukejudd-lux]

QRep partition table: pagination before sort/filter
qrepStatusTable.tsx slices the page from unsorted data, then sorts within the page. Should be filter -> sort -> paginate.

QRep graph: NaN values
qrepGraph.tsx line 55 uses ?? instead of || with Number(), feeding NaN into the chart.
Both in ui/app/mirrors/mirrorId/.