admin: ui polish pass, thirty findings from the emil audit

selected states stop changing font weight, buttons gain a pressed scale and scoped 120ms transitions with a reduced-motion override, every loading and empty state reserves its height, charts measure before first paint, hit targets rise to the 44px enhanced target where layout permits, long domains clamp to two lines on an unpadded inner span, chips and name cells truncate, tabular figures on counts and time columns, a z-index layer scale replaces magic numbers and fixes the dialog-over-confirm tie, history's empty state gains a clear-filters action, page headings balance, font smoothing and color-scheme land on the html reset.

admin/src/features/overview/chartKit.tsx

@@ -9,14 +9,14 @@
  * StyleX tokens instead.
  */
 
-import { useEffect, useRef, useState } from "react";
+import { useLayoutEffect, useRef, useState } from "react";
 import * as stylex from "@stylexjs/stylex";
 import { AxisBottom, AxisLeft, type TickRendererProps } from "@visx/axis";
 import { GridRows } from "@visx/grid";
 import { scaleBand, scaleLinear } from "@visx/scale";
 import { TooltipWithBounds } from "@visx/tooltip";
 import { styles as shared } from "@/ui/styles";
-import { colors } from "@/ui/tokens.stylex";
+import { colors, layers } from "@/ui/tokens.stylex";
 
 export const CHART_HEIGHT = 240;
 export const MARGIN = { top: 8, right: 8, bottom: 22, left: 44 } as const;
@@ -53,15 +53,18 @@ export function plotArea(width: number): Plot {
 }
 
 /**
- * The container's width, measured on mount and on every resize. Deliberately
- * `useEffect` rather than `useLayoutEffect`: the first paint draws at the
- * fallback width and the measured width lands a frame later, which is the
- * timing the charts have always had.
+ * The container's width, measured on mount and on every resize.
+ *
+ * `useLayoutEffect` rather than `useEffect`, because the difference is visible:
+ * a layout effect measures and re-renders before the browser paints, so the
+ * first painted frame is already the real width. Under `useEffect` the measured
+ * width lands one painted frame later, and the reader sees a chart drawn at
+ * `FALLBACK_WIDTH` snap to its container.
  */
 export function useMeasuredWidth(): [React.RefObject<HTMLDivElement | null>, number] {
 	const ref = useRef<HTMLDivElement>(null);
 	const [width, setWidth] = useState(0);
-	useEffect(() => {
+	useLayoutEffect(() => {
 		const el = ref.current;
 		if (el === null) return;
 		setWidth(el.clientWidth);
@@ -159,7 +162,7 @@ const styles = stylex.create({
 	tooltip: {
 		pointerEvents: "none",
 		position: "absolute",
-		zIndex: 10,
+		zIndex: layers.tooltip,
 		borderRadius: "0.25rem",
 		borderWidth: 1,
 		borderStyle: "solid",
@@ -240,7 +243,7 @@ function TickLabel({ x, dx, dy, textAnchor, dominantBaseline, formattedValue }:
 			dy={dy}
 			textAnchor={textAnchor}
 			dominantBaseline={dominantBaseline}
-			{...stylex.props(styles.axisLabel)}
+			{...stylex.props(styles.axisLabel, shared.tabularNums)}
 		>
 			{formattedValue}
 		</text>