fix(infrastructure): clamp gauge arc and fix disk key fallback

Two small pre-existing bugs in the infrastructure gauges.

Arc overdraw. Gauge computed strokeLength from the raw `progress` prop
while the label and the fill colour both used `progressWithinRange`,
the value clamped to 0-100. A reading above 100% therefore swept the
arc past a full circle - the offset (circumference - strokeLength)
went negative - while the label still read "100.0%". A negative
reading drew the arc backwards for the same reason. strokeLength now
uses the clamped value, so out-of-range input stops at exactly one
turn and matches what the label and colour already showed. Values in
range are unaffected.

The effect that animates the arc also listed `progress` in its
dependency array while only reading `strokeLength`, so it re-ran the
100ms animation on changes that could not alter the arc (105% to 110%,
say). Now that strokeLength is derived from the clamped value, the
stale dependency is dropped.

Disk key fallback. `disk?.device || 0 + idx` parses as
`disk?.device || (0 + idx)` because + binds tighter than ||, so the
fallback was just `idx` and the leading 0 did nothing. It happened to
produce unique keys, but by accident rather than intent, and a disk
whose device is the empty string collided with index 0. Replaced with
a `disk-${idx}` template so the intent is explicit.

Claude-Session: https://claude.ai/code/session_01AbYLvwpEaZFXktHVcqrFRd

client/src/Components/design-elements/Gauge.tsx

@@ -39,9 +39,12 @@ export const Gauge = forwardRef<HTMLDivElement, GaugeProps>(function Gauge(
 		() => ({
 			circumference: 2 * Math.PI * radius,
 			totalSize: radius * 2 + strokeWidth * 2,
-			strokeLength: (progress / 100) * (2 * Math.PI * radius),
+			// Uses the clamped value, like the label and the fill color: an
+			// out-of-range reading would otherwise sweep the arc past a full circle
+			// while the label read 100%.
+			strokeLength: (progressWithinRange / 100) * (2 * Math.PI * radius),
 		}),
-		[radius, strokeWidth, progress]
+		[radius, strokeWidth, progressWithinRange]
 	);
 
 	const [offset, setOffset] = useState(circumference);
@@ -52,7 +55,7 @@ export const Gauge = forwardRef<HTMLDivElement, GaugeProps>(function Gauge(
 		}, 100);
 
 		return () => clearTimeout(timer);
-	}, [progress, circumference, strokeLength]);
+	}, [circumference, strokeLength]);
 
 	const fillColor = getInfraGaugeColor(progressWithinRange, theme);
 

client/src/Pages/Infrastructure/Details/Components/Gauges.tsx

@@ -48,7 +48,7 @@ export const InfraDetailsGauges = ({
 			{snapshot?.disk?.map((disk, idx) => {
 				return (
 					<DetailGauge
-						key={disk?.device || 0 + idx}
+						key={disk?.device || `disk-${idx}`}
 						// title={`Disk ${idx} usage`}
 						title={t("pages.infrastructure.gauges.disk.title", { idx })}
 						maxWidth={260}