- Stats and StatGauges use CSS grid (5 + 4 columns) so cards in each
row are equal width; widths overridden against the legacy 25%-flex
GradientBox so they fill their grid cell.
- DetailGauge gains a maxWidth prop (default 225) so consumers in
wide grids can opt out of the cap.
- Section explainers above each row: "Runtime stats" + description,
"Memory & CPU" + description (i18n driven, propagated to all 16
locales via pages.logs.diagnostics.sections).
- Both grids render immediately with placeholder "—" values, so the
initial paint shows the layout and values fill in as data loads
(eliminates the layout shake when switching to the tab).