admin: overview redesign, device scope, one formatting contract (milestone 39)

The Overview page takes the decided visual language (specs/ui-visual-redesign.md): four centred totals with their Activity links, a smoothed area chart of total and blocked queries with point hover and a tooltip centred beside the point, a stacked client chart in eight distinct hues plus one Other band that is always a series, and a card row with the cache hit rate, the query types as a single-hue ramp ring, and the upstream breakdown. The count axis grows its margin with the widest grouped tick and draws whole-number ticks only.

GET /api/overview takes a client parameter; the scoped read uses idx_query_log_ts and the cache keeps scoped slots. The device selector beside the period selector is URL state, so a scoped view is a link, and the tile links carry the scope into Activity. The route reduces a pasted IPv6 scope to the RFC 5952 spelling the logger stores, mapped addresses included, and drops anything that is not an address. A failed device list says so under the selector with a retry.

All measured quantities go through admin/src/lib/format.ts: grouped counts, two-decimal percentages, one-decimal rates, durations as the two largest nonzero units. Identifiers, configured values and preset labels render as written; the module header states that scope. A sweep test refuses toFixed, toLocaleString, Intl.NumberFormat and padStart anywhere else.

Chrome: one 4px radius from the metrics constants, shared Card with a prominent title and a one-line description on every panel, the settings form sections on the same card with a floated legend, the sidebar grouped into Monitoring and System with a status block (protection, queries per minute on Overview, uptime), keyboard-focusable table scroll wrappers, and the accent darkened to 5.43:1 on its wash.

Not built: the spec's ranked-list primitive, which has no consumer and no API rows. Codex reviewed sessions B to D over five rounds (thirty-three findings fixed, thirteen rejected as non-quantities); the owner skipped a sixth round.

Claude-Session: https://claude.ai/code/session_01VTgx3a1zz1R78o4K55kkwR

admin/src/features/diagnostics/DiagnosticDetailPage.tsx

@@ -4,11 +4,12 @@ import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
 import { Link, useNavigate, useParams } from "@tanstack/react-router";
 import * as stylex from "@stylexjs/stylex";
 import InlineError from "@/lib/InlineError";
-import { formatDuration, formatTime } from "@/lib/format";
+import { formatCount, formatDuration, formatTime } from "@/lib/format";
 import { diagnosticPurgeMutation, diagnosticQuery } from "@/lib/queries";
 import ConfirmDialog from "@/ui/ConfirmDialog";
+import Card from "@/ui/Card";
 import { styles as shared } from "@/ui/styles";
-import { colors } from "@/ui/tokens.stylex";
+import { colors, metrics } from "@/ui/tokens.stylex";
 import SeverityBadge from "./SeverityBadge";
 import { componentLabel, copyFor } from "./eventCopy";
 
@@ -49,12 +50,6 @@ const styles = stylex.create({
 	panel: {
 		marginTop: "1rem",
 		maxWidth: "48rem",
-		borderRadius: "0.25rem",
-		borderWidth: 1,
-		borderStyle: "solid",
-		borderColor: colors.border,
-		backgroundColor: colors.surfaceRaised,
-		padding: "1rem",
 	},
 	facts: {
 		display: "grid",
@@ -75,9 +70,10 @@ const styles = stylex.create({
 	},
 	sectionHeading: {
 		marginTop: "1.5rem",
-		fontSize: "1.125rem",
-		lineHeight: "1.75rem",
-		fontWeight: 600,
+		fontSize: "1.4rem",
+		lineHeight: 1.2,
+		fontWeight: 650,
+		letterSpacing: "-0.015em",
 	},
 	prose: {
 		marginTop: "0.5rem",
@@ -89,7 +85,7 @@ const styles = stylex.create({
 		marginTop: "0.5rem",
 		maxWidth: "48rem",
 		overflowX: "auto",
-		borderRadius: "0.25rem",
+		borderRadius: metrics.radius,
 		borderWidth: 1,
 		borderStyle: "solid",
 		borderColor: colors.border,
@@ -185,7 +181,11 @@ export default function DiagnosticDetailPage() {
 			<p {...stylex.props(styles.subject)}>{data.subject}</p>
 			<InlineError error={purge.error} />
 
-			<div {...stylex.props(styles.panel)}>
+			<Card
+				title="Details"
+				description="How long this has been failing, how often it recurred, and whether it has cleared."
+				style={styles.panel}
+			>
 				<dl {...stylex.props(styles.facts)}>
 					<dt {...stylex.props(styles.term)}>State</dt>
 					<dd {...stylex.props(styles.value)}>
@@ -198,7 +198,7 @@ export default function DiagnosticDetailPage() {
 					<dt {...stylex.props(styles.term)}>Last seen</dt>
 					<dd {...stylex.props(styles.value)}>{formatTime(data.last_seen)}</dd>
 					<dt {...stylex.props(styles.term)}>Occurrences</dt>
-					<dd {...stylex.props(styles.value, shared.tabularNums)}>{data.occurrences}</dd>
+					<dd {...stylex.props(styles.value, shared.tabularNums)}>{formatCount(data.occurrences)}</dd>
 					<dt {...stylex.props(styles.term)}>Resolved</dt>
 					<dd {...stylex.props(styles.value)}>
 						{data.resolved_at === null ? "Not yet — still failing" : formatTime(data.resolved_at)}
@@ -208,7 +208,7 @@ export default function DiagnosticDetailPage() {
 					<dt {...stylex.props(styles.term)}>Code</dt>
 					<dd {...stylex.props(styles.value, shared.mono)}>{data.code}</dd>
 				</dl>
-			</div>
+			</Card>
 
 			<h2 {...stylex.props(styles.sectionHeading)}>Impact</h2>
 			<p {...stylex.props(styles.prose)}>{copy.impact}</p>