Complete React live and Race Hub views

frontend/src/api.ts

@@ -1,4 +1,4 @@
-import type { Meeting, RaceHub, Weekend } from './types'
+import type { LiveStateResponse, Meeting, RaceHub, Weekend } from './types'
 
 export async function fetchRaceHub(sessionKey: number): Promise<RaceHub> {
   const res = await fetch(`/api/v1/race-hub?session_key=${sessionKey}`)
@@ -33,3 +33,11 @@ export async function fetchWeekend(meetingKey: number): Promise<Weekend> {
   }
   return res.json()
 }
+
+export async function fetchLiveState(): Promise<LiveStateResponse> {
+  const res = await fetch('/api/v1/live/state')
+  if (!res.ok) {
+    throw new Error(`API ${res.status}: ${res.statusText}`)
+  }
+  return res.json()
+}