fix(tfl): handle near-1km boundary in formatDistance

Values like 0.9999km rounded to 1000m and displayed as
'1000m away'. Now converts to meters first and switches
to km format when rounded meters >= 1000.

Co-authored-by: Ona <no-reply@ona.com>

packages/aelis-source-tfl/src/renderer.test.tsx

@@ -61,6 +61,15 @@ describe("renderTflAlert", () => {
 		expect(caption.props.content).toBe("Nearest station: 2.5km away")
 	})
 
+	test("formats near-1km boundary as km not meters", () => {
+		const node = renderTflAlert(makeItem({ closestStationDistance: 0.9999 }))
+		const spec = render(node)
+
+		const root = spec.elements[spec.root]!
+		const caption = spec.elements[root.children![2]!]!
+		expect(caption.props.content).toBe("Nearest station: 1.0km away")
+	})
+
 	test("omits station distance when null", () => {
 		const node = renderTflAlert(makeItem({ closestStationDistance: null }))
 		const spec = render(node)

packages/aelis-source-tfl/src/renderer.tsx

@@ -14,10 +14,11 @@ const SEVERITY_LABEL: Record<TflAlertSeverity, string> = {
 }
 
 function formatDistance(km: number): string {
-	if (km < 1) {
-		return `${Math.round(km * 1000)}m away`
+	const meters = Math.round(km * 1000)
+	if (meters < 1000) {
+		return `${meters}m away`
 	}
-	return `${km.toFixed(1)}km away`
+	return `${(meters / 1000).toFixed(1)}km away`
 }
 
 export const renderTflAlert: FeedItemRenderer<"tfl-alert", TflAlertData> = (item) => {